Delete installed directories during uninstall

[Shushe] / GNUmakefile

# SPDX-FileCopyrightText: 2023, 2024 Lady <https://www.ladys.computer/about/#lady>
# SPDX-License-Identifier: MPL-2.0

SHELL = /bin/sh

# ━ § BASIC INFORMATION ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
override define makefileinfo
 ╭────────────────────────────╮
╔╡ ⁌ ⛩📰 书社 ∷ GNUmakefile ╞═════════════════════════════════╗
║╰────────────────────────────╯                                ║
╟┬ ¶ Prerequisites ───────────────────────────────────────────┬╢
║│                                                            │║
║│ Requires G·N·U Make, at least version 3.81, the Fine Free  │║
║│ File Command, and the various programs packaged with       │║
║│ libxml2 and libxslt. Beyond this, only programs specified  │║
║│ by Posix are required. The full list of program            │║
║│ requirements is as follows :—                             │║
║│                                                            │║
║│ • awk                                                      │║
║│ • cat                                                      │║
║│ • cd                                                       │║
║│ • cksum                                                    │║
║│ • cp                                                       │║
║│ • date                                                     │║
║│ • diff (with -u)                                           │║
║│ • file (specifically the Fine Free File Command)           │║
║│ • find                                                     │║
║│ • grep                                                     │║
║│ • git (optional)                                           │║
║│ • ln                                                       │║
║│ • make (specifically G·N·U Make, version 3.81 or later)    │║
║│ • mkdir                                                    │║
║│ • mv                                                       │║
║│ • od                                                       │║
║│ • pax (ustar format, when generating archives)             │║
║│ • printf                                                   │║
║│ • rm                                                       │║
║│ • sed                                                      │║
║│ • sleep                                                    │║
║│ • test                                                     │║
║│ • touch                                                    │║
║│ • tr                                                       │║
║│ • uuencode                                                 │║
║│ • uudecode                                                 │║
║│ • xargs                                                    │║
║│ • xmlcatalog (provided by libxml2)                         │║
║│ • xmllint (provided by libxml2)                            │║
║│ • xsltproc (provided by libxslt)                           │║
║│                                                            │║
║│ In all cases, you can supply your own version of any       │║
║│ program `program´ by overriding the corresponding variable │║
║│ `PROGRAM´ when calling Make.                               │║
║╰────────────────────────────────────────────────────────────╯║
╟┬ ¶ Usage ───────────────────────────────────────────────────┬╢
║│                                                            │║
║│ • `make all´ (default): Compile, but do not install, all   │║
║│   files.                                                   │║
║│                                                            │║
║│ • `make clean´: Remove `BUILDDIR´.                         │║
║│                                                            │║
║│ • `make gone´: Remove `BUILDDIR´ and installed files.      │║
║│                                                            │║
║│ • `make help´: Print this message.                         │║
║│                                                            │║
║│ • `make install´: Compile all files and install in         │║
║│   `DESTDIR´.                                               │║
║│                                                            │║
║│ • `make list´: List all recognized source files and their  │║
║│   classification (including media type and dependencies).  │║
║│                                                            │║
║│ • `make listout´: List out the destinations of all         │║
║│   resulting files (relative to `DESTDIR´), e·g for         │║
║│   processing by another script.                            │║
║│                                                            │║
║│ • `make uninstall´: Remove installed files, but not        │║
║│   `BUILDDIR´.                                              │║
║│                                                            │║
║│ Set `VERBOSE=1´ to see the text of commands as they are    │║
║│ executed.                                                  │║
║│                                                            │║
║│ See `README.markdown´ for a more involved description of   │║
║│ the capabilities and configuration of this program.        │║
║╰────────────────────────────────────────────────────────────╯║
╟┬ ¶ Copyright & License ─────────────────────────────────────┬╢
║│                                                            │║
║│ Copyright © 2023–2024 Lady [@ Ladys Computer].             │║
║│                                                            │║
║│ This Source Code Form is subject to the terms of the       │║
║│ Mozilla Public License, v 2.0. If a copy of the M·P·L was  │║
║│ not distributed with this file, You can obtain one at      │║
║│ <http://mozilla.org/MPL/2.0/>.                             │║
║╰────────────────────────────────────────────────────────────╯║
╚══════════════════════════════════════════════════════════════╝
endef

# ━ § MAKE·FILE SETUP ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

# Programs needed to run this make·file.
#
# If these are not installed on your computer, or you need to use a different implementation, you can override the appropriate variable.
AWK := awk
CAT := cat
CD := cd
CKSUM := cksum
CP := cp
DATE := date
DIFF := diff
FILE := file
FIND := find
GIT := git
GREP := grep
LN := ln
MKDIR := mkdir
MV := mv
OD := od
PAX := pax
PRINTF := printf
RM := rm
SED := sed
SLEEP := sleep
TEST := test
TOUCH := touch
TR := tr
UUDECODE := uudecode
UUENCODE := uuencode
XARGS := xargs
XMLCATALOG := xmlcatalog
XMLLINT := xmllint
XSLTPROC := xsltproc

# This variable is not used in normal execution.
#
# In the archiving `MODE´, it provides the X·M·L file from which the archive should be constructed.
SRC :=

# This variable is not used in normal execution.
#
# In the archiving `MODE´, it provides a user‐friendly name for the archive.
NAME :=

# The directory which contains the source files.
#
# Multiple directories can be given so long as files with the same name do not exist in each.
SRCDIR := sources

# The directory which contains “includes”:
# Files which may be included in other files but for which no final output will be generated.
#
# Multiple directories can be given so long as files with the same name do not exist in each.
#
# These can be inside of `SRCDIR´ directories if desired.
#
# This variable is also used by the two‐stage `MODE´, where it gives the include directory for the second stage.
INCLUDEDIR := $(foreach dir,$(SRCDIR),$(dir)/includes)

# The directory which contains the data files.
#
# Only used in the two‐stage `MODE´, and defaults to that `MODE´ if this directory exists.
# This directory is used as the include directory in the first stage.
#
# Multiple directories can be given so long as files with the same name do not exist in each.
DATADIR :=

# The directory in which to generate temporary buildfiles.
#
# This variable is also used by the archiving and two‐stage `MODE´s.
BUILDDIR := build

# The directory into which to output files on `make install´.
#
# This variable is also used by the archiving `MODE´.
DESTDIR := public

# The location of this Makefile (and related ⛩📰 书社 files), relative to the current working directory.
#
# By default, this is inferred from the variable `MAKEFILE_LIST´.
#
# This variable is also used by the archiving and two‐stage `MODE´s.
THISDIR := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST))))

# Configuration of `find´.
#
# By default, `find´ will ignore files which begin with a period and those which are likely to cause problems for `make´.
#
# These variables are also used by the two‐stage `MODE´.
EXTRAFINDRULES :=
EXTRAFINDINCLUDERULES :=
FINDRULES := '!' '(' '(' -name '[.-]*' -a '!' -name '.' -o -name '*[][*?:|$$%\#\\; ]*' -o -name '*[)]' ')' -a -prune ')'$(if $(EXTRAFINDRULES), -a '(' $(EXTRAFINDRULES) ')',)
FINDINCLUDERULES := $(FINDRULES)$(if $(EXTRAFINDINCLUDERULES), -a '(' $(EXTRAFINDINCLUDERULES) ')',)

# File extensions which indicate files in `SRCDIR´ which should be built as part of the first, rather than second, stage of the two‐stage `MODE´.
DATAEXT := rdf

# Rules for identifying files in `SRCDIR´ which should be built as part of the first, rather than second, stage of the two‐stage `MODE´.
#
# By default, this just constructs rules from `DATAEXT´.
EXTRAFINDDATARULES :=
FINDDATARULES := -name '.' $(foreach ext,$(DATAEXT), -o -name '$(subst ','"'"',[!.]*.$(ext))')$(if $(EXTRAFINDDATARULES), -a '(' $(EXTRAFINDDATARULES) ')',)

# The list of magic files to use when determining media types.
#
# Some are provided as part of this repository, but you can add more if you need different media type detection.
#
# Your computer probably has several already installed at `/usr/share/file/magic´.
EXTRAMAGIC :=
MAGIC := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/magic/*)) $(EXTRAMAGIC))

# The list of depedencies for parsers.
#
# When these files change, the assumption is that the result of the parsers will change as well, even if the parsers themselves have not.
EXTRAPARSERLIBS :=
PARSERLIBS := $(sort $(THISDIR)/lib/split.xslt $(EXTRAPARSERLIBS))

# The list of parsers for plaintext file types.
#
# Which parsers are provided will influence which kinds of files are recognized as plaintext.
EXTRAPARSERS :=
PARSERS := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/parsers/*.xslt)) $(EXTRAPARSERS))

# The list of depedencies for transforms.
#
# When these files change, the assumption is that the result of the transforms will change as well, even if the transforms themselves have not.
EXTRATRANSFORMLIBS :=
TRANSFORMLIBS := $(sort $(THISDIR)/lib/serialize.xslt $(EXTRATRANSFORMLIBS))

# The list of transforms.
EXTRATRANSFORMS :=
TRANSFORMS := $(sort $(patsubst ./%,%,$(wildcard $(THISDIR)/transforms/*.xslt)) $(EXTRATRANSFORMS))

# List of types which should be treated as X·M·L.
#
# Types which start with a `+´ are suffixes and match any type which
# ends accordingly.
XMLTYPES := application/xml text/xml +xml

# A program to run on basic X·M·L files after they are transformed.
FINALIZE := $(XMLLINT) --nonet --nsclean

ifdef GIT
ifneq ($(wildcard $(THISDIR)/.git),)
# A description of the current git revision of ⛩📰 书社.
THISREV := $(shell $(CD) $(THISDIR); $(GIT) describe 2>>/dev/null || $(GIT) rev-parse HEAD 2>>/dev/null || :)
endif

ifneq ($(wildcard .git),)
# A description of the current git revision of the working directory.
SRCREV := $(shell $(GIT) describe 2>>/dev/null || $(GIT) rev-parse HEAD 2>>/dev/null || :)
endif
endif

# The mode in which to run this make·file.
# Modes essentially allow for the combination of multiple conceptual make·files into a single source.
#
# The following modes are available :—
#
# • ‹ urn:fdc:ladys.computer:20231231:Shu1She4:mode:default ›:
#   The default mode; typical ⛩📰 书社 behaviours.
#
# • ‹ urn:fdc:ladys.computer:20231231:Shu1She4:mode:archive ›:
#   Generates archive files from parse results.
#
# • ‹ urn:fdc:ladys.computer:20231231:Shu1She4:mode:initial ›:
#   The initial mode that this make·file starts in; this builds the magic file and parsers and then recursively calls into the default mode to build the files.
MODE := urn:fdc:ladys.computer:20231231:Shu1She4:mode:initial

# Set to a non·empty value to silence informative messages.
QUIET :=

# Set to a non·empty value to print all commands as they run.
VERBOSE :=

# Posix locale information.
LC_ALL := C
export LC_ALL

# Posix timezone information.
TZ := UTC0
export UTC0

# The default target for this makefile.
.DEFAULT_GOAL := all

# Flags for use when calling the shell.
#
# `-e` enables early exit from invocations of multiple commands after
# the first failure.
.SHELLFLAGS := -c -e

# ━ § BEGIN SHARED MAKE·FILE CONSTRUCTS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

# ─ ¶ Non‐Recipe Variable Definitions ─────────────────────────────────

# A variable with no value, usable when assigning values which contain whitespace.
override empty :=

# A variable which contains a newline, to allow the generation of multiline strings in function calls.
override define newline


endef

# A variable which contains a single space.
override space := $(empty) $(empty)

# A variable which contains a single comma.
override comma := ,

# (callable) Make empty strings non·empty, and non·empty strings empty.
override not = $(if $1,,1)

# (callable) Quote the given string for use within shell calls.
override quote = '$(subst ','"'"',$1)'

# The command to use for percent‐decoding.
override perdeccmd := $(SED) 's/|/%7C/g;s/[\]/%5C/g;s/%[0123456789ABCDEFabcdef]\{2\}/|&|/g' | $(TR) '|' '\n' | $(SED) '/^%[0123456789ABCDEFabcdef]\{2\}$$/!s/%/|%25|/' | $(TR) '|' '\n' | $(AWK) '$$0!~/%/{printf "%s",$$0}/%/{d="0123456789ABCDEF";v=substr(toupper($$0),2,2);printf "\\%04o",(index(d,substr(v,1,1))-1)*16+index(d,substr(v,2,1))-1}' | $(SED) $(call quote,s/'/'"'"'/g;s/^/'/;s/$$/'/;$$!s/$$/\\/) | $(XARGS) -E '' $(PRINTF) '%b'

# (callable) Percent‐decode the given strings.
#
# ☡ This variable creates a subshell every time it is computed.
override perdec = $(shell $(PRINTF) '%s\0450A' $(foreach encoded,$1,$(call quote,$(encoded))) | $(perdeccmd))

# (callable) Percent‐encode the given strings.
#
# This singly‐encodes u·r·i characters and doubly‐encodes other characters, then calls `perdec´ to decode back to a single encoding.
# The encoding assumes the input is a “u·r·i component”; e·g that the resulting string should only contain `pchar´ (but can contain any `sub-delim´).
#
# It is assumed that the given strings do not contain newlines.
#
# ☡ This variable creates a subshell every time it is computed.
override perenc = $(shell $(PRINTF) '%s\n' $(foreach unencoded,$1,$(call quote,$(unencoded))) | $(OD) -t x1 | $(SED) 's/^[0123456789]*//;s/0[Aa]/%&/g;s/2[146789ABCDEabcde]/%&/g;s/3[0123456789AaBbDd]/%&/g;s/40/%&/g;s/[46][123456789ABCDEFabcdef]/%&/g;s/[57][0123456789Aa]/%&/g;s/5[Ff]/%&/g;s/7[Ee]/%&/g;s/[ ][0123456789ABCDEFabcdef]\{2\}/%25&/g' | $(TR) -d ' \n' | $(TR) 'abcdef' 'ABCDEF' | $(perdeccmd))

# (callable) Percent‐encode each component in the given paths.
#
# ☡ This variable creates a subshell every time it is computed.
override pathenc = $(subst %2F,/,$(call perenc,$1))

# (callable) Create a unique name for the given file, based on its absolute path.
#
# ☡ This variable creates a subshell every time it is computed.
namehash = $(shell $(PRINTF) '%s' $(call quote,$(abspath $1)) | $(CKSUM) | $(SED) 's/ .*//' | $(XARGS) -E '' $(PRINTF) '%X')-$(notdir $1)

# The location of this make·file.
override makefile := $(abspath $(THISDIR)/GNUmakefile)

# Non·empty if `help´ or `clean´, and no targets other than `help´ or `clean´, were specified as goals on the commandline.
override notbuilding := $(and $(filter help clean,$(MAKECMDGOALS)),$(call not,$(filter-out help clean,$(MAKECMDGOALS))))

# (callable) Tests to see if the prerequisites provided by the second argument matches the value in the file corresponding to the first argument in `$(BUILDDIR)/lastprereqs´.
# If not, saves the new value.
# Returns the values plus the file in `$(BUILDDIR)/lastprereqs´, which will always be newer than the target if there was a change.
#
# Calling this variable is useful when a given target should be updated whenever its list of prerequisites changes in addition to whenever there is a change to one of its prerequisites.
#
# If `$(notbuilding)´ is non·empty, this variable produces no result to avoid unnecessary work.
#
# ☡ This variable creates at least one subshell every time it is computed.
override diffprereqs = $(if $(notbuilding),,$(and $(subst $(shell $(CAT) $(call quote,$(BUILDDIR)/lastprereqs/$1) 2>>/dev/null || :),,$2),$(shell $(call ensuredirectory,$(BUILDDIR)/lastprereqs) && $(PRINTF) '%s\n' $(call quote,$2) >|$(BUILDDIR)/lastprereqs/$1),)$2 $(BUILDDIR)/lastprereqs/$1)

# ─ ¶ Recipe Variable Definitions ─────────────────────────────────────

# Outputs an `@´ to silence rules, unless `VERBOSE´ is non·empty.
override silent := $(if $(VERBOSE),,@)

# (callable) Only perform the rule if `QUIET` is not set.
override inform = $(if $(QUIET),,@$1)

# (callable) Check to see if the given directory exists and create it if not.
override ensuredirectory = if $(TEST) ! -d $(call quote,$1); then $(MKDIR) -p $(call quote,$1); fi

# Quote standard input in such a way that piping it to xargs will result in it being processed as a single argument.
#
# If standard input ends in a newline, it is stripped; all other newlines are preserved.
override xargsquote := $(SED) $(call quote,s/'/'"'"'/g;s/^/'/;s/$$/'/;$$!s/$$/\\/)

# Quote standard input in such a way that piping it to xargs will result in each line being processed as a single argument.
override xargsmultiquote := $(SED) $(call quote,s/'/'"'"'/g;s/^/'/;s/$$/'/)

# (callable) Test if the provided xpath expression matches the provided document.
override xpath = $(XMLLINT) --noent --nonet --xpath $(call quote,$1) $(call quote,$2) >>/dev/null 2>>/dev/null

# (callable) Get the identifier for the given parser or transform.
override id = $(XMLLINT) --noent --nonet --xpath '/*/*[local-name()="id" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"]/text()[1]' $(call quote,$1) 2>>/dev/null || $(PRINTF) '%s\n' $(call quote,about:shushe?$(or $2,unknown)=$(call pathenc,$(basename $(notdir $1))))

# (callable) Extract the value of the text nodes in the provided X·M·L document and print them to `stdout´.
override extracttext = $(PRINTF) '%s' '<transform xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0"><output method="text" encoding="UTF-8"/></transform>' | $(XSLTPROC) --nonet --novalid --nomkdir --nowrite - $(call quote,$1)

# (callable) Process the provided transformation result and output the result to the provided location, given the provided relative path.
override processresultto = if $(call xpath,/*[local-name()="raw-text" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then $(call extracttext,$1) >|$(call quote,$2); elif $(call xpath,/*[local-name()="base64-binary" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then { $(PRINTF) '%s\n' 'begin-base64 644 -'; $(call extracttext,$1) | $(TR) -d '\t\n\f\r '; $(PRINTF) '\n%s\n' '===='; } | $(UUDECODE) -o /dev/stdout >|$(call quote,$2); elif $(call xpath,/*[local-name()="archive" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$1); then $(MAKE) -f $(makefile) NAME=$(call quote,$3) SRC=$(call quote,$1) BUILDDIR=$(call quote,$(BUILDDIR)/archive/$3) DESTDIR=$(call quote,$(patsubst %/,%,$(dir $2))) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:archive' $(call quote,$2); else $(FINALIZE) $(call quote,$1) >|$(call quote,$2); fi

# ━ § BEGIN DEFAULT MAKE·FILE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

ifeq ($(MODE),urn:fdc:ladys.computer:20231231:Shu1She4:mode:default)

# ─ ¶ Non‐Recipe Variable Definitions ─────────────────────────────────

# (callable) Escape special characters for use in X·M·L.
override xmlesc = $(subst >,&gt;,$(subst <,&lt;,$(subst &,&amp;,$1)))

# (callable) Escape special characters for use in X·M·L attributes.
override attresc = $(subst ",&quot;,$(call xmlesc,$1))

# (callable) Escape special characters for use in sed regular expressions.
override sedesc = $(subst /,[/],$(subst $$,\$$,$(subst *,\*,$(subst .,\.,$(subst [,\[,$(subst ^,\^,$(subst \,\\,$1)))))))

# (overridable) Collect all of the applicable includes from the includes directory.
sourceincludes := $(if $(and $(INCLUDEDIR),$(wildcard $(INCLUDEDIR))),$(patsubst ./%,%,$(shell $(FIND) $(foreach dir,$(INCLUDEDIR),$(call quote,$(dir))) '(' $(FINDINCLUDERULES) ')' -a -type f -a -print)),)

# (overridable) Collect all of the applicable source files from the source directory, removing any which are also includes.
sourcefiles := $(if $(and $(SRCDIR),$(wildcard $(SRCDIR))),$(filter-out $(sourceincludes),$(patsubst ./%,%,$(shell $(FIND) $(foreach dir,$(SRCDIR),$(call quote,$(dir))) '(' $(FINDRULES) ')' -a -type f -a -print))))

# Figure out the file type of each source file and source include.
ifneq ($(wildcard $(BUILDDIR)/magic.mgc),)
override types := $(shell $(PRINTF) '%s\n' $(call quote,$(sourcefiles) $(sourceincludes)) | $(SED) 's/^ *//;s/ *$$//;s/ {2,}/ /g' | $(TR) ' ' '\n' | $(FILE) -m $(call quote,$(BUILDDIR)/magic.mgc) --mime-type --separator '|' --files-from - | $(SED) 's/| */|/g')
endif

# Get the list of supported plaintext file types from the parser.
ifneq ($(wildcard $(BUILDDIR)/parser.xslt),)
override plaintexttypes := $(filter-out $(XMLTYPES),$(shell $(XMLLINT) --noent --nonet --xpath '/*/*[@name="书社:parsers"]//*[namespace-uri()="http://www.w3.org/1999/xhtml" and local-name()="dd"]/text()' $(call quote,$(BUILDDIR)/parser.xslt)))
endif

# (callable) Get all of the files (source and includes) which have the provided types.
#
# If a provided type begins with a `+´, it is analysed as a suffix, and all matching types will be used.
override filesoftype = $(foreach typeorsuffix,$1,$(foreach type,$(if $(filter +%,$(typeorsuffix)),$(sort $(foreach suffixedtype,$(filter %$(typeorsuffix),$(types)),$(lastword $(subst |, ,$(suffixedtype))))),$(typeorsuffix)),$(patsubst %|$(type),%,$(filter %|$(type),$(types)))))

# Build up collections of various file types.
override xmlfiles := $(call filesoftype,$(XMLTYPES))
override plaintextfiles := $(filter-out $(xmlfiles),$(call filesoftype,$(plaintexttypes)))
override assetfiles := $(filter-out $(xmlfiles) $(plaintextfiles),$(sourcefiles) $(sourceincludes))

# (callable) Get the types of the given files.
override typeoffile = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(types))),application/octet-stream))

# (callable) Get the local path for the given source file.
override sourcepath = $(or $(firstword $(foreach directory,$(SRCDIR),$(if $(filter .,$(directory)),$(wildcard $1),$(if $(filter $(directory)/%,$1),$(patsubst $(directory)/%,%,$1),)))),$(error Unable to get local path for source file `$1´))

# (callable) Get the local path for the given include.
override includepath = $(or $(firstword $(foreach directory,$(INCLUDEDIR),$(if $(filter .,$(directory)),$(wildcard $1),$(if $(filter $(directory)/%,$1),$(patsubst $(directory)/%,%,$1),)))),$(error Unable to get local path for include file `$1´))

# (callable) Get base64 data u·r·i’s for the given files.
#
# ☡ This variable creates a subshell every time it is computed.
override datauri = $(foreach file,$1,data:$(call typeoffile,$(file));base64,$(shell $(UUENCODE) -m $(call quote,$(file)) _ | $(SED) '2,$$!d;$$d' | $(TR) -d ' \n'))

# Pair each source file and include with its local u·r·i.
override sourcelocalpair := $(foreach file,$(sourcefiles) $(sourceincludes),$(file)|about:shushe?$(if $(filter $(file),$(sourceincludes)),include=$(call pathenc,$(call includepath,$(file))),source=$(call pathenc,$(call sourcepath,$(file)))))

# (callable) Get local uris for the given files.
override localuri = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcelocalpair))))

# (callable) Get the source files for the given local uris.
override sourcefile = $(foreach local,$1,$(patsubst %|$(local),%,$(filter %|$(local),$(sourcelocalpair))))

# Resolves to the `FORCE´ target if `$(BUILDDIR)/.update-types´ is present.
#
# This file is created before a reload due to type changes, and is removed after.
# This ensures that file classifications are up·to·date immediately after the reload.
override typeupdates := $(and $(wildcard $(BUILDDIR)/.update-types),FORCE)

# Pair each source file and include with its metadata location.
override sourcemetadatapair := $(foreach file,$(sourcefiles) $(sourceincludes),$(file)|$(BUILDDIR)/$(if $(filter $(file),$(sourceincludes)),includes.metadata/$(call includepath,$(file)),sources.metadata/$(call sourcepath,$(file))))

# (callable) Get the location of the transformed X·M·L files for the given source files.
override metadata = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcemetadatapair))))

# (callable) Get the source files for the given parsed file.
override datadata = $(foreach file,$1,$(patsubst %|$(file),%,$(filter %|$(file),$(sourcemetadatapair))))

# Pair each source file and include with its parsed location.
override sourceparsedpair := $(foreach file,$(sourcefiles) $(sourceincludes),$(file)|$(BUILDDIR)/$(if $(filter $(file),$(sourceincludes)),includes/$(call includepath,$(file)),sources/$(call sourcepath,$(file))))

# (callable) Get the location of the transformed X·M·L files for the given source files.
override parsed = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(sourceparsedpair))))

# (callable) Get the source files for the given parsed file.
override unparsed = $(foreach file,$1,$(patsubst %|$(file),%,$(filter %|$(file),$(sourceparsedpair))))

# Pair each build directory, transform, source file, or parsed file with its file u·r·i.
override fileuripairs := $(join $(patsubst %,%|,$(BUILDDIR) $(TRANSFORMS) $(sourcefiles) $(sourceincludes) $(call parsed,$(sourcefiles) $(sourceincludes))),$(call pathenc,$(foreach uriable,$(BUILDDIR) $(TRANSFORMS) $(sourcefiles) $(sourceincludes) $(call parsed,$(sourcefiles) $(sourceincludes)),file://$(abspath $(uriable)))))

# (callable) Get the file u·r·is for the given transforms, source file or parsed files.
override fileuri = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(fileuripairs))),$(error Unable to get file u·r·i for `$(file)´)))

ifneq ($(wildcard $(BUILDDIR)/dependencies),)
# Pair each file with a list of dependencies for it.
override dependenciesforfile := $(foreach file,$(filter-out $(assetfiles),$(sourcefiles) $(sourceincludes)),$(file)|$(subst $(space),|,$(shell $(SED) $(call quote,/^$(call sedesc,$(call localuri,$(file)))$$/$(comma)/^[^     ]/!d;/^ /!d;s/^ //) <$(call quote,$(BUILDDIR)/dependencies))))

# (callable) Get the list of dependency leiris for the given source files.
#
# Recursive dependencies are marked with a leading `-´.
override dependencyuris = $(foreach file,$1,$(subst |, ,$(patsubst $(file)|%,%,$(filter $(file)|%,$(dependenciesforfile)))))

# (callable) Get the list of recursive dependencies for the given source files.
#
# If the file cannot have dependencies (e·g is an asset file), the resulting value will be the empty string.
override recursives = $(foreach uri,$(filter -%,$(call dependencyuris,$1)),$(call sourcefile,$(patsubst -%,%,$(uri))))

# (callable) Get the list of (nonrecursive) dependencies for the given source files.
#
# If the file cannot have dependencies (e·g is an asset file), the resulting value will be the empty string.
override dependencies = $(foreach uri,$(filter-out -%,$(call dependencyuris,$1)),$(call sourcefile,$(uri)))
endif

# Collect all files with recursive dependencies.
override recursivefiles := $(foreach file,$(filter-out $(assetfiles),$(sourcefiles)),$(if $(call recursives,$(file)),$(file),))

# Collect all files which should be compiled.
#
# This is all of the non·asset, nonrecursive files.
override compilablefiles := $(filter-out $(assetfiles) $(recursivefiles),$(sourcefiles))

# Collect all files which can be installed.
#
# This is all of the comilable files and all asset sources.
override installablefiles := $(compilablefiles) $(filter $(assetfiles),$(sourcefiles))

ifneq ($(wildcard $(BUILDDIR)/destinations),)
# Get the output of the destination transform.
override destinations := $(shell $(CAT) $(BUILDDIR)/destinations)

# Pair source files and their destinations.
override sourcedestinationpair := $(foreach destination,$(destinations),$(call sourcefile,$(firstword $(subst |, ,$(destination))))|$(subst $(space),|,$(wordlist 2,$(words $(subst |, ,$(destination))),$(subst |, ,$(destination)))))
endif

# (callable) Get the destination for the given source files, or return `.NOTDEF/$1´.
#
# The fallback here is because destinations are used to generate targets and thus must always be non·empty and should be unique, even when they haven’t been generated yet.
override destination = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcedestinationpair))),.NOTDEF/$1))

# Pair each source file with its compiled location.
override sourcecompiledpair := $(foreach file,$(sourcefiles),$(file)|$(BUILDDIR)/results/$(call destination,$(file)))

# (callable) Get the location of the transformed X·M·L files for the given source files.
override compiled = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(sourcecompiledpair))))

# (callable) Get the location of the source files for the given compiled file.
override uncompiled = $(foreach file,$1,$(patsubst %|$(file),%,$(filter %|$(file),$(sourcecompiledpair))))

# (callable) Get the location of the final built files for the given source files.
override built = $(foreach file,$1,$(patsubst $(BUILDDIR)/results/%,$(BUILDDIR)/public/%,$(call compiled,$(file))))

# (callable) Get the location of the source files for the given built files.
override unbuilt = $(foreach file,$1,$(call uncompiled,$(patsubst $(BUILDDIR)/public/%,$(BUILDDIR)/results/%,$(file))))

# (callable) Get the installed locations for the given source files.
override installed = $(foreach file,$1,$(DESTDIR)/$(call destination,$(file)))

# ─ ¶ Recipe Variable Definitions ─────────────────────────────────────

# (callable) Sanitize and wrap the provided plaintext file in X·M·L, printing to `stdout´.
override wrapplaintext = { $(PRINTF) '%s\n%s' '<?xml version="1.0"?>' '<script xmlns="http://www.w3.org/1999/xhtml" type="$(call typeoffile,$1)"><![CDATA['; $(TR) '\000\013\014' '\032\011\012' <$(call quote,$1) | $(SED) "$$($(PRINTF) '%b' 's/]]>/]]]]><!\\[CDATA\\[>/g\ns/\0357\0277\0276/�/g\ns/\0357\0277\0277/�/g\n$$!s/\\r$$//g\ns/\\r/\\n/g\n$$!s/\0302\0205$$//g\ns/\0302\0205/\\n/g\ns/\0342\0200\0250/\\n/g\ns/[\0001\0002\0003\0004\0005\0006\0007\0010]/�/g\ns/[\0016\0017\0020\0021\0022\0023\0024\0025\0026\0027\0031\0032\0033\0034\0035\0036\0037]/�/g')"; $(PRINTF) '%s\n' ']]></script>'; }

# (callable) Check if the provided X·M·L file is X·M·L 1.1, and if so, coerce to X·M·L 1.0 as best as possible, printing the result (or the original file contents) to `stdout´.
#
# The X·M·L declaration will be dropped and character escapes for C0 control codes will be replaced with a literal `U+0091 PRIVATE USE ONE´, which is invalid in X·M·L 1.1, but valid X·M·L 1.0 (making the replacement obvious).
#
# This isn’t a perfect substitution (it makes some assumptions about the format of the underlying X·M·L), but it should be workable for most sensible, welformed files.
override serializexml = $(SED) "$$($(PRINTF) '%b' '/<?xml[ \t]\\{1,\\}version=[\0042\0047]1.1/,$${ s/<?xml[^>]*?>/<!--<?xml version=\00421.1\0042?>-->/\n s/&\0043x0*[12345678BCEFbcef];/\0302\0221/g\n s/&\0043x0*1[0123456789ABCDEFabcdef];/\0302\0221/g\n s/&\00430*[12345678];/\0302\0221/g\n s/&\00430*1[12456789];/\0302\0221/g\n s/&\00430*2[0123456789];/\0302\0221/g\n s/&\00430*3[01];/\0302\0221/g\n}')" <$(call quote,$1) | $(SED) "$$($(PRINTF) '%b' ':a\n/^\\n*$$/{ $$d\n N\n ba\n}')"

# ─ ¶ Phony Targets ───────────────────────────────────────────────────

# Compile all files, or error if any are recursive.
all : $(call built,$(recursivefiles) $(installablefiles)) ;

# Install the compiled files into `DESTDIR´, or error if any are recursive.
install : $(call installed,$(recursivefiles) $(installablefiles)) ;

# List all source files and includes and their computed types.
list :
        @$(PRINTF) '%b' $(call quote,$(foreach file,$(sort $(sourcefiles)) $(sort $(sourceincludes)),\0033[1m$(file)\0033[22m|$(call typeoffile,$(file))|[\0033[3m$(if $(filter $(file),$(xmlfiles)),xml,$(if $(filter $(file),$(plaintextfiles)),text,asset))$(if $(filter $(file),$(sourceincludes)),|include,)\0033[23m]$(if $(call dependencies,$(file))$(call recursives,$(file)), $(strip $(foreach recursive,$(call recursives,$(file)),\0033[93;41m•|Recursive|Dependency|\0033[39;49m|$(recursive)) $(foreach dependency,$(call dependencies,$(file)),\0033[2m•|Dependency|\0033[22m|$(dependency))))$(if $(filter $(file),$(sourcefiles)), →|<\0033[4m/$(call destination,$(file))\0033[24m>,) )) | $(TR) ' |' '\n '

# Lists out the destinations of all resulting files (relative to `DESTDIR´).
listout :
        @$(PRINTF) '%s\n' $(call quote,$(foreach file,$(sort $(sourcefiles)),$(call destination,$(file))))

# Destroy installed files.
uninstall :
        $(foreach file,$(installablefiles),$(if $(wildcard $(call installed,$(file))),$(silent)$(PRINTF) '%s\n' $(call quote,Removing </$(patsubst $(DESTDIR)/%,%,$(call installed,$(file)))>…)$(newline)$(silent)$(RM) -f -R $(call quote,$(call installed,$(file)))$(newline),))

# Raise an error when attempting to build any files with recursive dependencies.
$(call built,$(recursivefiles)) :
        @$(PRINTF) '%b\n' $(call quote,\0033[93;41mError:\0033[39;49m `$(call unbuilt,$@)´ has recursive dependencies:\n$(subst |, ,$(subst $(space),$(newline),$(foreach recursive,$(call recursives,$(call unbuilt,$@)),•|$(recursive))))) >&2 && exit 1

# Add as a prerequisite to treat the target as tho it were phony.
FORCE : ;

# ─ ¶ Special Targets ─────────────────────────────────────────────────

# Perform secondary expansion; this enables pattern rules to determine their prerequisites based on the matched pattern.
.SECONDEXPANSION : ;

# Don’t use any implicit rules.
.SUFFIXES : ;

# Don’t delete these files even if Make is stopped in the process of rebuilding them.
.PRECIOUS : $(THISDIR)/GNUmakefile ;

# Phony rules; always consider these out·of·date.
.PHONY : FORCE all install list listout uninstall $(call built,$(recursivefiles)) ;

# Reload this make·file if the transform has changed.
#
# This also captures any changes to dependencies or destinations.
$(THISDIR)/GNUmakefile : $(BUILDDIR)/transform.xslt
        $(silent)$(TOUCH) $(THISDIR)/GNUmakefile
        $(if $(typeupdates),$(silent)$(RM) $(call quote,$(BUILDDIR)/.update-types),)
        $(call inform,$(PRINTF) '%b\n' '\0033[1mDependency graph$(comma) output destinations$(comma) and transforms were updated. Restarting…\0033[22m' >&2)

# ─ ¶ Build Targets ───────────────────────────────────────────────────

# Generate R·D·F metadata for files.
$(call metadata,$(sourcefiles) $(sourceincludes)) : % : $$(call datadata,$$@) $(THISDIR)/.metadata-format-changed-since $(typeupdates)
        $(call inform,$(PRINTF) '%s\n' $(call quote,Generating metadata for `$<´…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent){ if $(TEST) ! -f $(call quote,$(BUILDDIR)/.mtime); then $(PRINTF) '%b' '\n' >|$(call quote,$(BUILDDIR)/.mtime); fi; $(TOUCH) -r $(call quote,$<) $(call quote,$(BUILDDIR)/.mtime); $(DIFF) -u $(call quote,$(BUILDDIR)/.mtime) /dev/null | $(SED) '1!d;s/.*   \([^ ]*\) \([^ ]*\).*$$/\1T\2Z/'; $(CKSUM) $(call quote,$<) | $(SED) 's/[ ].*//'; } | $(xargsmultiquote) | $(XARGS) -E '' $(PRINTF) '<?xml version="1.0"?><书社vocab:$(if $(filter $<,$(sourceincludes)),IncludeFile,SourceFile) xmlns:nie="http://www.semanticdesktop.org/ontologies/2007/01/19/nie#" xmlns:nfo="http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:书社vocab="urn:fdc:ladys.computer:20231231:Shu1She4:vocab:" rdf:about="%s" 书社vocab:path="%s" nfo:fileUrl="%s"><nie:interpretedAs>$(if $(filter $<,$(assetfiles)),<nfo:InformationElement nie:mimeType="%s"/>,<nfo:PlainTextDocument nie:mimeType="%s"/>)</nie:interpretedAs><书社vocab:hasParsedFile nfo:fileUrl="%s"/><nfo:fileLastModified rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">%s</nfo:fileLastModified><nfo:hasHash nfo:hashAlgorithm="CRC32" nfo:hashValue="%s"/></书社vocab:$(if $(filter $<,$(sourceincludes)),IncludeFile,SourceFile)>' $(call quote,$(call attresc,$(call localuri,$<))) $(call quote,$(call attresc,$(if $(filter $<,$(sourceincludes)),$(call includepath,$<),$(call sourcepath,$<)))) $(call quote,$(call attresc,$(call fileuri,$<))) $(call quote,$(call attresc,$(call typeoffile,$<))) $(call quote,$(call attresc,$(call fileuri,$(call parsed,$<)))) >|$(call quote,$@)

# Parse the files.
#
# Even plain X·M·L files are parsed, because they may contain X·H·T·M·L `<script>´ elements which contain other kinds of data.
# Asset files are turned into H·T·M·L embeds pointing to `data:´ U·R·I’s.
$(call parsed,$(sourcefiles) $(sourceincludes)) : % : $$(call unparsed,$$@) $(BUILDDIR)/parser.xslt $(PARSERLIBS) $(typeupdates)
        $(call inform,$(PRINTF) '%s\n' $(call quote,Processing `$<´…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(if $(filter $<,$(assetfiles)),$(PRINTF) '%s\n' $(call quote,<?xml version="1.0"?><object xmlns="http://www.w3.org/1999/xhtml" type="$(call typeoffile,$<)" data="$(call datauri,$<)"/>) >|$(call quote,$@),$(if $(filter $<,$(plaintextfiles)),$(call wrapplaintext,$<),$(call serializexml,$<)) | $(XSLTPROC) --nonet --novalid --nomkdir --nowrite --stringparam BUILDTIME $$($(DATE) -u '+%Y-%m-%dT%H:%M:%SZ') --stringparam IDENTIFIER $(call quote,$(call localuri,$<))$(if $(THISREV), --stringparam THISREV $(call quote,$(THISREV)),)$(if $(SRCREV), --stringparam SRCREV $(call quote,$(SRCREV)),) $(call quote,$(BUILDDIR)/parser.xslt) - >|$(call quote,$@))

# Collect the metadata into a single file, and generate the dependencies and destinations files as side·effects.
#
# Doing this all in one step reduces the number of calls to `xsltproc´ required, but requires that it be called from the build directory (necessitating a subshell).
$(BUILDDIR)/dependencies $(BUILDDIR)/destinations $(BUILDDIR)/metadata : $(call diffprereqs,metadatas,$(call metadata,$(sort $(sourcefiles) $(sourceincludes)))) $(call parsed,$(filter-out $(assetfiles),$(sourcefiles) $(sourceincludes))) $(THISDIR)/lib/expandmetadata.xslt
        $(call inform,$(PRINTF) '%s\n' 'Compiling metadata…' >&2)
        $(silent){ $(PRINTF) '<?xml version="1.0"?><rdf:RDF xmlns:nie="http://www.semanticdesktop.org/ontologies/2007/01/19/nie#" xmlns:nfo="http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:书社vocab="urn:fdc:ladys.computer:20231231:Shu1She4:vocab:"><书社vocab:BuildDirectory nfo:fileUrl="%s"/>' $(call quote,$(call attresc,$(call fileuri,$(BUILDDIR)))); {$(foreach meta,$(call metadata,$(sort $(sourcefiles) $(sourceincludes))), $(CAT) $(call quote,$(meta));) } | $(SED) 's/<?xml version="1.0"?>//g'; $(PRINTF) '%s\n' '</rdf:RDF>'; } | ( $(CD) $(call quote,$(BUILDDIR)); $(XSLTPROC) --nonet --novalid --nomkdir $(call quote,$(abspath $(THISDIR)/lib/expandmetadata.xslt)) - ) | $(XMLLINT) --nonet --nsclean - >|$(call quote,$(BUILDDIR)/metadata)

# Generate the main transform.
#
# Because this depends on the metadata, it will also update the dependencies and destinations.
$(BUILDDIR)/transform.catalog : $(call diffprereqs,transforms,$(sort $(TRANSFORMS)))
        $(call inform,$(PRINTF) '%s\n' 'Generating catalog of transforms…' >&2)
        $(silent)$(XMLCATALOG) --create --noout $(call quote,$@)
        $(foreach transform,$(TRANSFORMS),$(silent){ $(call id,$(transform)); $(PRINTF) '%s\n' $(call quote,$(call fileuri,$(transform))) '--noout' $(call quote,$@); } | $(xargsmultiquote) | $(XARGS) -E '' $(XMLCATALOG) --add uri$(newline))
$(BUILDDIR)/transform.xslt : $(BUILDDIR)/transform.catalog $(BUILDDIR)/metadata $(THISDIR)/lib/literally.xslt $(THISDIR)/lib/catalog2transform.xslt
        $(call inform,$(PRINTF) '%s\n' 'Generating main transform…' >&2)
        $(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite --stringparam METADATA $(call quote,$(call fileuri,$(BUILDDIR))/metadata) $(call quote,$(THISDIR)/lib/catalog2transform.xslt) $(call quote,$<) >|$(call quote,$@)

# Compile the result files using the dependencies as necessary.
#
# Altho this (obviously) depends on the main transform, it is not listed as a prerequisite (rather, the main transform is listed as a prerequisite for the make·file writ large). This is because the transform will update after every metadata change (i·e, basically constantly), but compiled files should only actually be updated in two cases :⁠—
#
# • When one of the actual transforms are updated (tracked by `transform.catalog´), and
# • When the metadata of ⹐source files they depend on⹑ change.
#
# This is to reduce the number of needless regenerations of files with no substantial change.
$(call compiled,$(compilablefiles)) : $(BUILDDIR)/results/% : $$(call parsed,$$(call uncompiled,$$@)) $$(call parsed,$$(call dependencies,$$(call uncompiled,$$@))) $(BUILDDIR)/transform.catalog $(TRANSFORMLIBS) $$(call metadata,$$(call dependencies,$$(call uncompiled,$$@)))
        $(call inform,$(PRINTF) '%s\n' $(call quote,Compiling </$*>…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite --stringparam METADATA 'metadata' --stringparam BUILDTIME $$($(DATE) -u '+%Y-%m-%dT%H:%M:%SZ') --stringparam IDENTIFIER $(call quote,$(call localuri,$(call uncompiled,$@)))$(if $(THISREV), --stringparam THISREV $(call quote,$(THISREV)),)$(if $(SRCREV), --stringparam SRCREV $(call quote,$(SRCREV)),) $(call quote,$(BUILDDIR)/transform.xslt) $(call quote,$<) >|$(call quote,$@)

# Create the final files from the compiled results (or error in the case of recursive ones).
$(call built,$(compilablefiles)) : $(BUILDDIR)/public/% : $(BUILDDIR)/results/%
        $(call inform,$(PRINTF) '%s\n' $(call quote,Building </$*>…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(RM) -f -R $(call quote,$@)
        $(silent)$(call processresultto,$<,$@,$*)
$(call built,$(filter $(assetfiles),$(sourcefiles))) : $(BUILDDIR)/public/% : $$(call unbuilt,$$@)
        $(call inform,$(PRINTF) '%s\n' $(call quote,Building </$*>…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(RM) -f -R $(call quote,$@)
        $(silent)$(CP) $(call quote,$<) $(call quote,$@)

# Install compiled files (or error in the case of recursive ones).
$(call installed,$(recursivefiles) $(installablefiles)) : $(DESTDIR)/% : $(BUILDDIR)/public/%
        $(call inform,$(PRINTF) '%s\n' $(call quote,Installing </$*>…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(RM) -f -R $(call quote,$@)
        $(silent)$(CP) -R $(call quote,$<) $(call quote,$@)

# ━ § BEGIN ARCHIVE MAKE·FILE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

else ifeq ($(MODE),urn:fdc:ladys.computer:20231231:Shu1She4:mode:archive)

# ─ ¶ Non‐Recipe Variable Definitions ─────────────────────────────────

# Get the list of files in the archive.
ifneq ($(wildcard $(BUILDDIR)/index),)
override archivefiles := $(patsubst ./extracted/%,%,$(shell $(CAT) $(call quote,$(BUILDDIR)/index)))
endif

# ─ ¶ Recipe Variable Definitions ─────────────────────────────────────

# ─ ¶ Phony Targets ───────────────────────────────────────────────────

# ─ ¶ Special Targets ─────────────────────────────────────────────────

# Don’t use any implicit rules.
.SUFFIXES : ;

# Don’t delete these files even if Make is stopped in the process of rebuilding them.
.PRECIOUS : $(THISDIR)/GNUmakefile ;

# Reload this make·file if the archive components have changed.
$(THISDIR)/GNUmakefile : $(BUILDDIR)/index
        $(silent)$(TOUCH) $(THISDIR)/GNUmakefile
        $(call inform,$(PRINTF) '%b\n' $(call quote,\0033[1mArchive components for </$(NAME)> updated. Restarting…\0033[22m) >&2)

# ─ ¶ Build Targets ───────────────────────────────────────────────────

# Build the extractor transform for extracting the contents of the archive source file.
$(BUILDDIR)/extractor.xslt : $(SRC) $(THISDIR)/lib/archive2extractor.xslt
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite $(call quote,$(THISDIR)/lib/archive2extractor.xslt) $(call quote,$<) >|$(call quote,$@)

# Use the extractor transform to extract the archive source file out into its components.
#
# This target sleeps for 1 second to ensure the resulting index will always be newer than this make·file.
#
# If the archive is empty, the index will not be written by `xsltproc´ and will need to be manually created.
$(BUILDDIR)/index : $(BUILDDIR)/extractor.xslt $(SRC)
        $(call inform,$(PRINTF) '%s\n' $(call quote,Extracting components for </$(NAME)>…) >&2)
        $(silent)$(SLEEP) 1
        $(silent)$(XSLTPROC) --nonet --novalid -o $(call quote,$@) --writesubtree $(call quote,$(dir $@)) $(call quote,$<) $(call quote,$(SRC))
        $(silent)if $(TEST) ! -e $(call quote,$@); then $(TOUCH) $(call quote,$@); fi

# All archive components are extracted alongside the index.
$(foreach file,$(archivefiles),$(BUILDDIR)/extracted/$(file)) : $(BUILDDIR)/index ;

# Process each extractor component into its final form.
$(foreach file,$(archivefiles),$(BUILDDIR)/files/$(file)) : $(BUILDDIR)/files/% : $(BUILDDIR)/extracted/%
        $(call inform,$(PRINTF) '%s\n' $(call quote,Building </$(NAME)/$*>…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(RM) -f -R $(call quote,$@)
        $(silent)$(call processresultto,$<,$@,$*)

# Archive all components in the file to the destination.
#
# This is a match‐anything target, with the assumption that this make·file is being called recursively from the default mode.
$(DESTDIR)/% : $(SRC) $(foreach file,$(archivefiles),$(BUILDDIR)/files/$(file))
        $(call inform,$(PRINTF) '%s\n' $(call quote,Archiving </$(NAME)>…) >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(RM) -f -R $(call quote,$@)
        $(silent)$(call ensuredirectory,$(BUILDDIR)/files)
        $(silent)$(CD) $(call quote,$(BUILDDIR)/files); if $(call xpath,/*/@*[local-name()="expanded" and namespace-uri()="urn:fdc:ladys.computer:20231231:Shu1She4"],$(abspath $<)); then $(MKDIR) -p $(call quote,$(abspath $@)); $(PRINTF) '$(if $(archivefiles),%s\n,)' $(foreach file,$(archivefiles),$(call quote,$(file))) | $(PAX) -r -w $(call quote,$(abspath $@)); else $(PRINTF) '$(if $(archivefiles),%s\n,)' $(foreach file,$(archivefiles),$(call quote,$(file))) | $(PAX) -w -x ustar >|$(call quote,$(abspath $@)); fi

# ━ § BEGIN INITIAL MAKE·FILE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

else ifeq ($(MODE),urn:fdc:ladys.computer:20231231:Shu1She4:mode:initial)

# ─ ¶ Non‐Recipe Variable Definitions ─────────────────────────────────

# Non·empty if this is a two‐step build.
override twostep := $(if $(DATADIR),$(shell if $(TEST) -d $(call quote,$(DATADIR)); then $(PRINTF) '%s\n' '1'; fi),)

# Pair each source magic file with its location in the build directory.
override magicpair := $(foreach magicfile,$(MAGIC),$(magicfile)|$(BUILDDIR)/magic/$(call namehash,$(magicfile)))

# (callable) Get the source file for the given magic files.
override magicsource = $(foreach magicpath,$1,$(patsubst %|$(magicpath),%,$(firstword $(filter %|$(magicpath),$(magicpair)))))

# (callable) Get the build file for the given magic files.
override magicfile = $(foreach file,$1,$(patsubst $(file)|%,%,$(filter $(file)|%,$(magicpair))))

# Pair each parser with its file u·r·i.
override fileuripairs := $(join $(patsubst %,%|,$(PARSERS)),$(call pathenc,$(foreach uriable,$(PARSERS),file://$(abspath $(uriable)))))

# (callable) Get the file u·r·is for the given parsers.
override fileuri = $(foreach file,$1,$(or $(patsubst $(file)|%,%,$(filter $(file)|%,$(fileuripairs))),$(error Unable to get file u·r·i for `$(file)´)))

ifeq ($(twostep),)
# (overridable) Options to use when calling ⛩📰 书社.
shusheopts := MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:default'
else
# (overridable) Options to use when calling ⛩📰 书社 the first time.
shushedataopts := INCLUDEDIR=$(call quote,$(DATADIR)) BUILDDIR=$(call quote,$(BUILDDIR)/data) FINDRULES=$(subst $$,$$$$,$(call quote,$(FINDRULES) -a '(' $(FINDDATARULES) ')')) FINDINCLUDERULES=$(subst $$,$$$$,$(call quote,$(FINDINCLUDERULES))) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:default'

# (overridable) Options to use when calling ⛩📰 书社 the second time.
shushesiteopts := INCLUDEDIR=$(call quote,$(INCLUDEDIR) $(BUILDDIR)/data/public) BUILDDIR=$(call quote,$(BUILDDIR)/site) FINDRULES=$(subst $$,$$$$,$(call quote,$(FINDRULES) -a '!' '(' $(FINDDATARULES) ')')) FINDINCLUDERULES=$(subst $$,$$$$,$(call quote,$(FINDINCLUDERULES))) MODE='urn:fdc:ladys.computer:20231231:Shu1She4:mode:default'
endif

# ─ ¶ Recipe Variable Definitions ─────────────────────────────────────

# ─ ¶ Phony Targets ───────────────────────────────────────────────────

ifeq ($(twostep),)
all install list listout uninstall : $(BUILDDIR)/magic.mgc $(BUILDDIR)/parser.xslt
        @$(MAKE) -f $(call quote,$(makefile)) $@ $(shusheopts)
else
all : $(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt data
        @$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
install uninstall : all
        @$(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts)
        @$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
list : $(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt data
        @$(PRINTF) '%b' $(call quote,\0033[1;7m||Stage|1:||\0033[22;27m\0033[4m||||||||||||||||||||\0033[24m ) | $(TR) ' |' '\n '
        @$(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts)
        @$(PRINTF) '%b' $(call quote, \0033[1;7m||Stage|2:||\0033[22;27m\0033[4m||||||||||||||||||||\0033[24m ) | $(TR) ' |' '\n '
        @$(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts)
listout : $(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt data
        @{ $(MAKE) -f $(call quote,$(makefile)) $@ $(shushedataopts); $(MAKE) -f $(call quote,$(makefile)) $@ $(shushesiteopts); } | $(SED) '$$!s/$$/ /' | $(TR) -d '\n'
list1 listout1 : %1 : $(BUILDDIR)/data/magic.mgc $(BUILDDIR)/data/parser.xslt
        @$(MAKE) -f $(call quote,$(makefile)) $* $(shushedataopts)
list2 listout2 : %2 : $(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt data
        @$(MAKE) -f $(call quote,$(makefile)) $* $(shushesiteopts)
endif

# Destroy buildfiles.
clean :
        $(if $(BUILDDIR),$(silent)$(RM) -f -R $(call quote,$(BUILDDIR)/),)

ifneq ($(twostep),)
# Build the data and remove outdated data files.
data : $(BUILDDIR)/data.out
        $(silent)$(FIND) $(call quote,$(BUILDDIR)/data/public) '!' -exec $(GREP) -F -q -x '{}' $(call quote,$<) ';' -a '(' -type d -o -print ')' | $(xargsmultiquote) | $(XARGS) -E '' $(RM)
endif

# Provide help.
help :
        @$(PRINTF) '%b' '$(subst $(newline),\n,$(makefileinfo))'

# Destroy build directory and installed files.
gone : uninstall clean ;

# Add as a prerequisite to treat the target as tho it were phony.
FORCE : ;

# ─ ¶ Special Targets ─────────────────────────────────────────────────

# Perform secondary expansion; this enables pattern rules to determine their prerequisites based on the matched pattern.
.SECONDEXPANSION : ;

# Don’t use any implicit rules.
.SUFFIXES : ;

# Phony rules; always consider these out·of·date.
.PHONY : FORCE all clean gone install list listout uninstall$(if $(DATADIR), data list1 listout1 list2 listout2,) ;

# ─ ¶ Build Targets ───────────────────────────────────────────────────

# Create symbolic links from the build directory’s store of magic files to their corresponding sources.
$(call magicfile,$(MAGIC)) : $(BUILDDIR)/magic/% : $$(call magicsource,$$@)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(LN) -sf $(call quote,$(realpath $<)) $(call quote,$@)

# Generate the compiled magic file from its sources.
#
# It must be updated if any of the files in the magic directory change.
$(BUILDDIR)/magic.mgc : $(call diffprereqs,magic,$(sort $(call magicfile,$(MAGIC))))
        $(foreach outdated,$(filter-out $^,$(wildcard $(BUILDDIR)/magic/*)),$(silent)$(RM) $(call quote,$(outdated))$(newline))
        $(call inform,$(PRINTF) '%s\n' 'Compiling new magic…' >&2)
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(CD) $(call quote,$(BUILDDIR)) && $(FILE) -C -m $(call quote,$(realpath $(BUILDDIR)/magic))
        $(silent)$(TOUCH) $(call quote,$(BUILDDIR)/.update-types)

# Generate the main parser.
$(BUILDDIR)/parser.catalog : $(call diffprereqs,parsers,$(sort $(PARSERS)))
        $(call inform,$(PRINTF) '%s\n' 'Generating catalog of parsers…' >&2)
        $(silent)$(XMLCATALOG) --create --noout $(call quote,$@)
        $(foreach parser,$(PARSERS),$(silent){ $(call id,$(parser)); $(PRINTF) '%s\n' $(call quote,$(call fileuri,$(parser))) '--noout' $(call quote,$@); } | $(xargsmultiquote) | $(XARGS) -E '' $(XMLCATALOG) --add uri$(newline))
$(BUILDDIR)/parser.xslt : $(BUILDDIR)/parser.catalog $(THISDIR)/lib/catalog2parser.xslt
        $(call inform,$(PRINTF) '%s\n' 'Generating main parser…' >&2)
        $(silent)$(XSLTPROC) --nonet --novalid --nomkdir --nowrite $(call quote,$(THISDIR)/lib/catalog2parser.xslt) $(call quote,$<) >|$(call quote,$@)
        $(silent)$(TOUCH) $(call quote,$(BUILDDIR)/.update-types)

ifneq ($(twostep),)
$(BUILDDIR)/data/magic.mgc $(BUILDDIR)/data/parser.xslt : $(BUILDDIR)/data/% : $(BUILDDIR)/$$*
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(LN) -sf $(call quote,$(realpath $<)) $(call quote,$@)
$(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt : $(BUILDDIR)/site/% : $(BUILDDIR)/$$*
        $(silent)$(call ensuredirectory,$(dir $@))
        $(silent)$(LN) -sf $(call quote,$(realpath $<)) $(call quote,$@)
$(BUILDDIR)/data.out : $(BUILDDIR)/data/magic.mgc $(BUILDDIR)/data/parser.xslt FORCE
        @$(MAKE) -f $(call quote,$(makefile)) $(shushedataopts)
        @$(MAKE) -s -f $(call quote,$(makefile)) listout QUIET=1 $(shushedataopts) | $(TR) ' ' '\n' | $(xargsmultiquote) | $(XARGS) -E '' $(PRINTF) $(call quote,$(BUILDDIR)/data/public/%s\n) >$(call quote,$(BUILDDIR)/data.out)
endif

ifeq ($(twostep),)
$(BUILDDIR)/lastprereqs/% : ;
$(BUILDDIR)/% : $(BUILDDIR)/magic.mgc $(BUILDDIR)/parser.xslt FORCE
        @$(MAKE) -f $(call quote,$(makefile)) $(call quote,$@) $(shusheopts)
$(DESTDIR)/% : $(BUILDDIR)/magic.mgc $(BUILDDIR)/parser.xslt FORCE
        @$(MAKE) -f $(call quote,$(makefile)) $(call quote,$@) $(shusheopts)
else
$(BUILDDIR)/data/% : $(BUILDDIR)/data/magic.mgc $(BUILDDIR)/data/parser.xslt FORCE
        @$(MAKE) -f $(call quote,$(makefile)) $(call quote,$@) $(shushedataopts)
$(BUILDDIR)/site/% : $(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt data
        $(silent)$(call ensuredirectory,$(dir $@))
        @$(MAKE) -f $(call quote,$(makefile)) $(call quote,$@) $(shushesiteopts)
$(DESTDIR)/% : $(BUILDDIR)/site/magic.mgc $(BUILDDIR)/site/parser.xslt data
        @$(MAKE) -f $(call quote,$(makefile)) $(call quote,$@) $(if $(shell $(GREP) -F -x $(call quote,$(BUILDDIR)/data/$*) $(BUILDDIR)/data.out),$(shushedataopts),$(shushesiteopts))
endif

# ━ § END DEFINED MAKE·FILE MODES ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

else
$(error Unrecognized MODE: $(MODE))
endif