Add dddoc/

dddoc/README.md

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+_This documentation file was extracted from `dddoc.sh` using the following
+command:_
+
+    ./dddoc.sh -d . dddoc.sh && mv dddoc.sh.md README.md
+
+dddoc -- Double-Dièse Documentation extractor
+=============================================
+
+This script is designed to extract inline documentation from shell scripts
+or libraries, or any other language using the sharp (#) as a comment mark.
+It follows the tradition of POD (Plain Old Documentation), but permits an
+easier-to-read syntax, allowing you to use the markup language that suits 
+you (such as MarkDown, txt2tags, etc.).
+
+The only pre-requisite is that the comment lines to be extracted start with
+two sharps (##), hence the name of this script ("dièse" stands for "sharp"
+in French). The two sharps must be followed by at least one space or an end
+of line for the line to be extracted; for instance, lines starting with
+three sharps won't be extracted. Both sharps starting the line, and exactly
+one space (if any) will be stripped.
+
+Each output file bares the name of the corresponding input file, with a
+user-defined suffix (`-s` switch), that defaults to "md".
+
+The input file hierarchy is respected, and this script is best used along
+with `find` and `xargs`, for instance:
+
+    cd /project/path
+    find * -type f -print0 | xargs -0 dddoc /path/to/destdir
+
+The destination directory could be a clone of a GitLab wiki (or Gitea, or
+GitHub...), which will allow you to easily publish a nice-looking set of
+docs.
+
+License
+=======
+
+Copyright 2018 Matteo Cypriani <mcy@lm7.fr>
+
+This program is free software. It comes without any warranty, to the extent
+permitted by applicable law. You can redistribute it and/or modify it under
+the terms of the Do What The Fuck You Want To Public License, Version 2, as
+published by Sam Hocevar. See http://sam.zoy.org/wtfpl/COPYING for more
+details.
+
+Globals
+=======
+
+This section and the followings document `dddoc.sh`; they are not
+particularly interesting, but are meant as a demonstration and documenting
+guide.
+
+- `PROGNAME`: this script's name
+- `DESTDIR`: output directory
+- `VERBOSE`: verbose level
+- `SUFFIX`: suffix (extension) of output files
+- `REGEX`: the regular expression that determines which lines will be
+  extracted from input files
+
+Functions
+=========
+
+print_usage()
+-------------
+Prints the usage message.
+
+bad_usage()
+-----------
+Prints the usage message to the standard error and exits with an error code.
+

dddoc/dddoc.sh

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+#!/bin/sh
+#
+## _This documentation file was extracted from `dddoc.sh` using the following
+## command:_
+##
+##     ./dddoc.sh -d . dddoc.sh && mv dddoc.sh.md README.md
+##
+## dddoc -- Double-Dièse Documentation extractor
+## =============================================
+##
+## This script is designed to extract inline documentation from shell scripts
+## or libraries, or any other language using the sharp (#) as a comment mark.
+## It follows the tradition of POD (Plain Old Documentation), but permits an
+## easier-to-read syntax, allowing you to use the markup language that suits
+## you (such as MarkDown, txt2tags, etc.).
+##
+## The only pre-requisite is that the comment lines to be extracted start with
+## two sharps (##), hence the name of this script ("dièse" stands for "sharp"
+## in French). The two sharps must be followed by at least one space or an end
+## of line for the line to be extracted; for instance, lines starting with
+## three sharps won't be extracted. Both sharps starting the line, and exactly
+## one space (if any) will be stripped.
+##
+## Each output file bares the name of the corresponding input file, with a
+## user-defined suffix (`-s` switch), that defaults to "md".
+##
+## The input file hierarchy is respected, and this script is best used along
+## with `find` and `xargs`, for instance:
+##
+##     cd /project/path
+##     find * -type f -print0 | xargs -0 dddoc /path/to/destdir
+##
+## The destination directory could be a clone of a GitLab wiki (or Gitea, or
+## GitHub...), which will allow you to easily publish a nice-looking set of
+## docs.
+##
+## License
+## =======
+##
+## Copyright 2018 Matteo Cypriani <mcy@lm7.fr>
+##
+## This program is free software. It comes without any warranty, to the extent
+## permitted by applicable law. You can redistribute it and/or modify it under
+## the terms of the Do What The Fuck You Want To Public License, Version 2, as
+## published by Sam Hocevar. See http://sam.zoy.org/wtfpl/COPYING for more
+## details.
+
+set -e
+#set -x
+
+##
+## Globals
+## =======
+##
+## This section and the followings document `dddoc.sh`; they are not
+## particularly interesting, but are meant as a demonstration and documenting
+## guide.
+##
+
+## - `PROGNAME`: this script's name
+PROGNAME="$(basename "$0")"
+
+## - `DESTDIR`: output directory
+DESTDIR=
+
+## - `VERBOSE`: verbose level
+VERBOSE=1
+
+## - `SUFFIX`: suffix (extension) of output files
+SUFFIX=".md"
+
+## - `REGEX`: the regular expression that determines which lines will be
+##   extracted from input files
+REGEX='^##( |$)'
+
+##
+## Functions
+## =========
+##
+
+## print_usage()
+## -------------
+## Prints the usage message.
+##
+print_usage()
+{
+    cat <<EOF
+Usage:
+    $PROGNAME [-h]
+    $PROGNAME -d <output_dir> [-s <suffix>] [-v] <file1> [file2 ...]
+Options:
+    -h: display this help and exit
+    -d: output files' destination directory
+    -s: output files' suffix (default: "$SUFFIX")
+    -q: set verbose level to 0
+    -v: increment verbose level; this option can be provided several times
+Verbose levels (default is $VERBOSE):
+    0 = silent
+    1 = display global options
+    2 = print a message for each generated files
+    3 = print a message for skipped files as well
+EOF
+}
+
+## bad_usage()
+## -----------
+## Prints the usage message to the standard error and exits with an error code.
+##
+bad_usage()
+{
+    print_usage >&2
+    exit 127
+}
+
+
+###
+### Main program
+### ============
+### (Note that these triple-dashed comments won't be extracted by this script.)
+###
+
+# Parse CLI options
+while getopts d:hqs:v option ; do
+    case $option in
+        h)  print_usage
+            exit 0
+            ;;
+        d)  DESTDIR="$OPTARG" ;;
+        q)  VERBOSE=0 ;;
+        s)  SUFFIX=".$OPTARG" ;;
+        v)  VERBOSE=$((VERBOSE + 1)) ;;
+        *)  bad_usage
+    esac
+done
+shift $((OPTIND - 1))
+
+# Check CLI options
+if [ -z "$DESTDIR" ] || [ $# -lt 1 ] ; then
+    bad_usage
+fi
+
+if [ $VERBOSE -ge 1 ] ; then
+    printf 'Verbose level: %d\n' "$VERBOSE"
+    printf 'Will use "%s" as the destination directory.\n' "$DESTDIR"
+    printf 'Will use "%s" as a suffix for output files.\n' "$SUFFIX"
+fi
+
+while [ -n "$1" ] ; do
+    src="$1"
+    shift
+    srcdir="$(dirname "$src")"
+    destdir="$DESTDIR/$srcdir"
+    dest="$destdir/$(basename "$src")$SUFFIX"
+
+    if ! grep -Eq "$REGEX" "$src" ; then
+        [ $VERBOSE -ge 3 ] && printf \
+            "\"%s\" doesn't seem to contain any double-sharp comments. Skipping.\\n" \
+            "$src"
+        continue
+    fi
+
+    [ $VERBOSE -ge 2 ] && \
+        printf 'Extracting doc from "%s" to "%s"...\n' "$src" "$dest"
+
+    mkdir -p "$destdir"
+    sed -rn "s/$REGEX//p" "$src" >"$dest"
+done
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4