Update date in changelog and manual.

MANUAL.txt

@@ -1,7 +1,7 @@
 ---
 title: Pandoc User's Guide
 author: John MacFarlane
-date: March 4, 2021
+date: March 8, 2021
 ---
 
 # Synopsis

changelog.md

@@ -1,6 +1,6 @@
 # Revision history for pandoc
 
-## pandoc 2.12 (UNRELEASED -- PROVISIONAL)
+## pandoc 2.12 (2021-03-08)
 
   * `--resource-path` now accumulates if specified multiple
     times (#6152).  Resource paths specified later on the command line are

man/pandoc.1

@@ -1,7 +1,7 @@
 '\" t
-.\" Automatically generated by Pandoc 2.11.4
+.\" Automatically generated by Pandoc 2.12
 .\"
-.TH "Pandoc User\[cq]s Guide" "" "March 4, 2021" "pandoc 2.12" ""
+.TH "Pandoc User\[cq]s Guide" "" "March 8, 2021" "pandoc 2.12" ""
 .hy
 .SH NAME
 pandoc - general markup converter
@@ -457,16 +457,15 @@ On *nix and macOS systems this will be the \f[C]pandoc\f[R] subdirectory
 of the XDG data directory (by default, \f[C]$HOME/.local/share\f[R],
 overridable by setting the \f[C]XDG_DATA_HOME\f[R] environment
 variable).
-If that directory does not exist, \f[C]$HOME/.pandoc\f[R] will be used
-(for backwards compatibility).
-In Windows the default user data directory is
+If that directory does not exist and \f[C]$HOME/.pandoc\f[R] exists, it
+will be used (for backwards compatibility).
+On Windows the default user data directory is
 \f[C]C:\[rs]Users\[rs]USERNAME\[rs]AppData\[rs]Roaming\[rs]pandoc\f[R].
 You can find the default user data directory on your system by looking
 at the output of \f[C]pandoc --version\f[R].
-A \f[C]reference.odt\f[R], \f[C]reference.docx\f[R], \f[C]epub.css\f[R],
-\f[C]templates\f[R], \f[C]slidy\f[R], \f[C]slideous\f[R], or
-\f[C]s5\f[R] directory placed in this directory will override
-pandoc\[cq]s normal defaults.
+Data files placed in this directory (for example,
+\f[C]reference.odt\f[R], \f[C]reference.docx\f[R], \f[C]epub.css\f[R],
+\f[C]templates\f[R]) will override pandoc\[cq]s normal defaults.
 .TP
 \f[B]\f[CB]-d\f[B]\f[R] \f[I]FILE\f[R], \f[B]\f[CB]--defaults=\f[B]\f[R]\f[I]FILE\f[R]
 Specify a set of default option settings.
@@ -731,9 +730,9 @@ system default.
 To see the system default, use
 \f[C]pandoc --print-default-data-file=abbreviations\f[R].
 The only use pandoc makes of this list is in the Markdown reader.
-Strings ending in a period that are found in this list will be followed
-by a nonbreaking space, so that the period will not produce
-sentence-ending space in formats like LaTeX.
+Strings found in this list will be followed by a nonbreaking space, and
+the period will not produce sentence-ending space in formats like LaTeX.
+The strings may not contain spaces.
 .SS General writer options
 .TP
 \f[B]\f[CB]-s\f[B]\f[R], \f[B]\f[CB]--standalone\f[B]\f[R]
@@ -924,6 +923,11 @@ Note that, if \f[C]--resource-path\f[R] is specified, the working
 directory must be explicitly listed or it will not be searched.
 For example: \f[C]--resource-path=.:test\f[R] will search the working
 directory and the \f[C]test\f[R] subdirectory, in that order.
+This option can be used repeatedly.
+Search path components that come later on the command line will be
+searched before those that come earlier, so
+\f[C]--resource-path foo:bar --resource-path baz:bim\f[R] is equivalent
+to \f[C]--resource-path baz:bim:foo:bar\f[R].
 .TP
 \f[B]\f[CB]--request-header=\f[B]\f[R]\f[I]NAME\f[R]\f[B]\f[CB]:\f[B]\f[R]\f[I]VAL\f[R]
 Set the request header \f[I]NAME\f[R] to the value \f[I]VAL\f[R] when
@@ -1887,6 +1891,38 @@ verbosity: INFO
 \f[R]
 .fi
 .PP
+In fields that expect a file path (or list of file paths), the following
+syntax may be used to interpolate environment variables:
+.IP
+.nf
+\f[C]
+csl:  ${HOME}/mycsldir/special.csl
+\f[R]
+.fi
+.PP
+\f[C]${USERDATA}\f[R] may also be used; this will always resolve to the
+user data directory that is current when the defaults file is parsed,
+regardless of the setting of the environment variable
+\f[C]USERDATA\f[R].
+.PP
+\f[C]${.}\f[R] will resolve to the directory containing the default file
+itself.
+This allows you to refer to resources contained in that directory:
+.IP
+.nf
+\f[C]
+epub-cover-image: ${.}/cover.jpg
+epub-metadata: ${.}/meta.xml
+resource-path:
+- .             # the working directory from which pandoc is run
+- ${.}/images   # the images subdirectory of the directory
+                # containing this defaults file
+\f[R]
+.fi
+.PP
+This environment variable interpolation syntax \f[I]only\f[R] works in
+fields that expect file paths.
+.PP
 Default files can be placed in the \f[C]defaults\f[R] subdirectory of
 the user data directory and used from any directory.
 For example, one could create a file specifying defaults for writing