Better wrapper support for plural result trees

[Shushe] / README.markdown

diff --git a/README.markdown b/README.markdown
index 89dfd2efddc97526a4dbb4448ffff77f1a82dd94..95f6954adf6de627ab19e93c620329efb203f852 100644 (file)
--- a/README.markdown
+++ b/README.markdown
@@ -91,14 +91,17 @@ In every case, you may supply your own implementation by overriding the
   corresponding (allcaps) variable (e·g, set `MKDIR` to supply your own
   `mkdir` implementation).
 
   corresponding (allcaps) variable (e·g, set `MKDIR` to supply your own
   `mkdir` implementation).
 

+- `awk`

 - `cat`
 - `cp`
 - `date`
 - `echo`
 - `file`
 - `find`
 - `cat`
 - `cp`
 - `date`
 - `echo`
 - `file`
 - `find`

+- `git` (optional; set `GIT=` to disable)

 - `mkdir` (requires support for `-p`)
 - `mv`
 - `mkdir` (requires support for `-p`)
 - `mv`

+- `od` (requires support for `-t x1`)

 - `printf`
 - `rm`
 - `sed`
 - `printf`
 - `rm`
 - `sed`


@@ -108,6 +111,7 @@ In every case, you may supply your own implementation by overriding the
 - `touch`
 - `tr` (requires support for `-d`)
 - `uuencode` (requires support for `-m` and `-r`)
 - `touch`
 - `tr` (requires support for `-d`)
 - `uuencode` (requires support for `-m` and `-r`)

+- `xargs` (requires support for `-0`)

 - `xmlcatalog` (provided by `libxml2`)
 - `xmllint` (provided by `libxml2`)
 - `xsltproc` (provided by `libxslt`)
 - `xmlcatalog` (provided by `libxml2`)
 - `xmllint` (provided by `libxml2`)
 - `xsltproc` (provided by `libxslt`)


@@ -154,17 +158,11 @@ The following additional variables can be used to control the behaviour
 - **`MAGICDIR`:**
   The location of the magic files to use (default: `$(THISDIR)/magic`).
 
 - **`MAGICDIR`:**
   The location of the magic files to use (default: `$(THISDIR)/magic`).
 

-- **`FINDOPTS`:**
-  Options to pass to `find` when searching for source files (default:
-    `-PE`).
-

 - **`FINDRULES`:**
 - **`FINDRULES`:**

-  Rules to use with `find` when searching for source files (default:
-    `-flags -nohidden -and -not -name '.*'`).
-
-- **`FINDINCLUDEOPTS`:**
-  Options to pass to `find` when searching for includes (default:
-    `$(FINDOPTS)`).
+  Rules to use with `find` when searching for source files.
+  The default ignores hidden files, those that start with a period or
+    hyphen‐minus, and those which contain a pipe, buck, percent,
+    bracket, hash, asterisk, eroteme, semi, or colon.

 
 - **`FINDINCLUDERULES`:**
   Rules to use with `find` when searching for includes (default:
 
 - **`FINDINCLUDERULES`:**
   Rules to use with `find` when searching for includes (default:


@@ -210,11 +208,13 @@ Text formats with associated X·S·L·T parsers are wrapped in a H·T·M·L
 Source files whose media type does not have an associated X·S·L·T
   parser are considered “assets” and will not be transformed.
 
 Source files whose media type does not have an associated X·S·L·T
   parser are considered “assets” and will not be transformed.
 

-For compatibility with this program, source filenames should not
-  contain Ascii whitespace or any of the following Ascii characters:
-  ``!"#$%&()-:<>?\^`{|}``.
-These characters are either invalid in u·r·i’s or conflict with aspects
-  of the Make or commandline syntax.
+**☡ For compatibility with this program, source file·names must not
+  contain Ascii white·space, colons (`:`), semis (`;`), pipes (`|`),
+  bucks (`$`), percents (`%`), hashes (`#`), asterisks (`*`), brackets
+  (`[` or `]`), erotemes (`?`), or control characters, and must not
+  begin with a hyphen‐minus (`-`).**
+The former characters have the potential to conflict with make syntax,
+  and a leading hyphen‐minus is confusable for a command‐line argument.

 
 ## Parsers
 
 
 ## Parsers
 


@@ -257,8 +257,10 @@ For example, the trivial `text/plain` parser is defined as follows :⁠—
 <transform
   xmlns="http://www.w3.org/1999/XSL/Transform"
   xmlns:html="http://www.w3.org/1999/xhtml"
 <transform
   xmlns="http://www.w3.org/1999/XSL/Transform"
   xmlns:html="http://www.w3.org/1999/xhtml"

+  xmlns:书社="urn:fdc:ladys.computer:20231231:Shu1She4"

   version="1.0"
 >
   version="1.0"
 >

+  <书社:id>example:text/plain</书社:id>

   <template match="html:script[@type='text/plain']">
     <html:pre><value-of select="."/></html:pre>
   </template>
   <template match="html:script[@type='text/plain']">
     <html:pre><value-of select="."/></html:pre>
   </template>


@@ -273,8 +275,21 @@ Alternatively, you can set the `@书社:supported-media-types` attribute
   on the root element of the parser to override media type support
   detection.
 
   on the root element of the parser to override media type support
   detection.
 

-Parsers can also target specific dialects of X·M·L, in which case they
-  operate on the same basic principles as transforms (described below).
+Even when `@书社:supported-media-types` is set, it is a requirement
+  that each parser transform any `<html:script>` elements with a
+  `@type` which matches their registered types into something else.
+Otherwise the parser will be stuck in an endless loop.
+The result tree of applying the transform to the `<html:script>`
+  element will be reparsed (in case any new `<html:script>` elements
+  were added in its subtree), and a `@书社:parsed-by` attribute will be
+  added to each toplevel element in the result.
+The value of this attribute will be the value of the `<书社:id>`
+  toplevel element in the parser.
+
+It is possible for parsers to support zero plaintext types.
+This is useful when targeting specific dialects of X·M·L; parsers in
+  this sense operate on the same basic principles as transforms
+  (described below).

 The major distinction between X·M·L parsers and transforms is where in
   the process the transformation happens:
 Parsers are applied *prior* to embedding (and can be used to generate
 The major distinction between X·M·L parsers and transforms is where in
   the process the transformation happens:
 Parsers are applied *prior* to embedding (and can be used to generate


@@ -307,6 +322,15 @@ Embedding takes place after parsing but before transformation, so
   and update them accordingly; it will signal an error if the
   dependencies are recursive.
 
   and update them accordingly; it will signal an error if the
   dependencies are recursive.
 

+## Output Redirection
+
+By default, ⛩️📰 书社 installs files to the same location in `DESTDIR`
+  as they were placed in their `SRCDIR`.
+This behaviour can be customized by setting the `@书社:destination`
+  attribute on the root element, whose value can give a different path.
+This attribute is read after parsing, but before transformation (where
+  it is silently dropped).
+

 ## Transforms
 
 Transforms are used to convert X·M·L files into their final output,
 ## Transforms
 
 Transforms are used to convert X·M·L files into their final output,


@@ -352,10 +376,32 @@ The following are recommendations on effective creation of
 - Set `@exclude-result-prefixes` on the root `xslt:transform` element
     to reduce the number of declared namespaces in the final result.
 
 - Set `@exclude-result-prefixes` on the root `xslt:transform` element
     to reduce the number of declared namespaces in the final result.
 

-The params `$buildtime`, `$srctime`, and `$path` are available within
-  transforms and are initialized to the current time, the time that the
-  source file was last modified, and the path of the output file within
-  $(DESTDIR).
+## Global Params
+
+The following params are made available globally in parsers and
+  transforms :⁠—
+
+- **`BUILDTIME`:**
+  The current time.
+
+- **`SRCREV`:**
+  The tag or hash of the current commit in the working directory (if
+    `GIT` is defined and `./.git` exists).
+
+- **`SRCTIME`:**
+  The time at which the source file was last modified.
+
+- **`VERSION`:**
+  The tag or hash of the current commit in `THISDIR` (if `GIT` is
+    defined and `$(THISDIR)/.git` exists).
+
+The following params are only available in transforms :⁠—
+
+- **`CATALOG`:**
+  The path of the catalog file (within `BUILDDIR`).
+
+- **`PATH`:**
+  The path of the output file (within `DESTDIR`).

 
 ## Output Wrapping
 
 
 ## Output Wrapping
 


@@ -382,7 +428,7 @@ In addition to being called with the transform result, each of these
   modes will additionally be called with a `<xslt:include>` element
   corresponding to each transform.
 If a transform has a `<书社:id>` top‐level element whose value is an
   modes will additionally be called with a `<xslt:include>` element
   corresponding to each transform.
 If a transform has a `<书社:id>` top‐level element whose value is an

-  i·r·i, its `<xslt:import>` element will have a corresponding
+  i·r·i, its `<xslt:include>` element will have a corresponding

   `@书社:id` attribute.
 This mechanism can be used to allow transforms to insert content
   without matching any elements in the result; for example, the
   `@书社:id` attribute.
 This mechanism can be used to allow transforms to insert content
   without matching any elements in the result; for example, the