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I wrote a posix shell help2man that can be used in place of the GNU perl based implementation. Output is not 1:1 (nor will it ever be). Some formatting is not yet applied, this will be fixed over time. For now this gives us manuals where there weren't any.
284 lines
8.6 KiB
Bash
Executable File
284 lines
8.6 KiB
Bash
Executable File
#!/bin/sh
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#
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# A POSIX shell help2man implementation. Supports most options but does not
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# output identical manuals. Written in a few hours this is still in "alpha"
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# status. Please let me know if there are any issues.
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#
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# Copyright (c) 2019-2021 Dylan Araps
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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args() {
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while _arg=$1; do
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case $1 in -[a-zA-Z]) shift; esac
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case $_arg in
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-n|--name=*) _arg_name=${1##--name=}
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: "${_arg_name:?"$_arg requires an argument"}" ;;
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-s|--section=*) _arg_section=${1##--section=}
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: "${_arg_section:?"$_arg requires an argument"}" ;;
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-m|--manual=*) _arg_manual=${1##--manual=}
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: "${_arg_manual:?"$_arg requires an argument"}" ;;
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-S|--source=*) _arg_source=${1##--source=}
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: "${_arg_source:?"$_arg requires an argument"}" ;;
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-i|--include=*|-I|--opt-include=*) _arg_include=${1##--include=}
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: "${_arg_include:?"$_arg requires an argument"}" ;;
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-o|--output=*) _arg_output=${1##--output=}
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: "${_arg_output:?"$_arg requires an argument"}" ;;
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--version)
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cat <<EOF
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GNU ${0##*/} 1.47.16
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Copyright (c) Dylan Araps 2021
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This version output must spoof
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GNU help2man so build systems
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automatically work with it.
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EOF
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exit 0
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;;
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-h|--help-option=*) _arg_help_option=${1##--help-option=}
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: "${_arg_help_option:?"$_arg requires an argument"}" ;;
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-v|--version-option=*) _arg_version_option=${1##--version-option=}
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: "${_arg_version_option:?"$_arg requires an argument"}" ;;
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--version-string=*) _arg_version_string=${1##--version-string=}
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: "${_arg_version_string:?"$_arg requires an argument"}" ;;
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--no-discard-stderr)
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cmd_stderr=1
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;;
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-p|--info-page=*|-N|--no-info|-l|--libtool|-L|--locale=*)
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# Not implemented.
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;;
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-*)
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cat <<EOF
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${0##*/} generates a man page out of '--help' and '--version' output.
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Usage: ${0##*/} [OPTION]... EXECUTABLE
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-n, --name=STRING description for the NAME paragraph
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-s, --section=SECTION section number for manual page (1, 6, 8)
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-m, --manual=TEXT name of manual (User Commands, ...)
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-S, --source=TEXT source of program (FSF, Debian, ...)
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-L, --locale=STRING select locale (default "C")
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-i, --include=FILE include material from 'FILE'
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-I, --opt-include=FILE include material from 'FILE' if it exists
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-o, --output=FILE send output to 'FILE'
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-p, --info-page=TEXT name of Texinfo manual
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-N, --no-info suppress pointer to Texinfo manual
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-l, --libtool exclude the 'lt-' from the program name
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--help print this help, then exit
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--version print version number, then exit
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EXECUTABLE should accept '--help' and '--version' options and produce output on
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stdout although alternatives may be specified using:
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-h, --help-option=STRING help option string
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-v, --version-option=STRING version option string
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--version-string=STRING version string
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--no-discard-stderr include stderr when parsing option output
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Report bugs to <dylan.araps@gmail.com>.
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EOF
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exit 0
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;;
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*)
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exe=$1
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break
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;;
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esac
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shift
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done
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}
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fnr() {
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# Replace all occurrences of substrings with substrings. This
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# function takes pairs of arguments iterating two at a time
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# until everything has been replaced.
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_fnr=$1
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shift 1
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while :; do case $_fnr-$# in
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*"$1"*) _fnr=${_fnr%"$1"*}${2}${_fnr##*"$1"} ;;
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*-2) break ;;
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*) shift 2
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esac done
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}
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clean() {
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_trim=${1#${1%%[![:space:]]*}}
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_trim=${_trim%${_trim##*[![:space:]]}}
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fnr "$_trim" " " " " " " " "
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}
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get_help() {
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case $cmd_stderr in
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1) cmd_help=$("$exe" "${_arg_help_option:---help}" 2>&1) ;;
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*) cmd_help=$("$exe" "${_arg_help_option:---help}")
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esac || :
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cmd_help=${cmd_help:?cannot get --help info from "$exe"}
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}
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get_version() {
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case $cmd_stderr in
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1) cmd_version_raw=${_arg_version_string:-\
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$("$exe" "${_arg_version_option:---version}" 2>&1)} ;;
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*) cmd_version_raw=${_arg_version_string:-\
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$("$exe" "${_arg_version_option:---version}")}
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esac || :
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read -r cmd_name cmd_version _junk <<EOF
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$cmd_version_raw
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EOF
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case $cmd_name in GNU)
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cmd_name="$cmd_name $cmd_version"
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cmd_version=$_junk
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esac
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cmd_version_raw="$cmd_name $cmd_version"
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cmd_name=${cmd_name##GNU }
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cmd_NAME=$(tr '[:lower:]' '[:upper:]' <<EOF
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$cmd_name
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EOF
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)
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}
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get_sections() {
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while IFS= read -r line || [ "$line" ]; do
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case $line in
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*[Uu][Ss][Aa][Gg][Ee]:*)
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sect_usage=$sect_usage${line#[Uu][Ss][Aa][Gg][Ee]: }$nl.P$nl
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;;
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*[Oo][Rr]:*)
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sect_usage=$sect_usage${line#[Oo][Rr]: }$nl.P$nl
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;;
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*"$cmd_name $cmd_version"*)
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# Skip lines containing what is probably the version string.
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# Some utilities do not provide --version and so --help includes
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# such information.
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;;
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*"Report bugs"*|Report[[:space:]]*[[:space:]]bugs)
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sect_bug=$line
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;;
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[[:space:]]*[[:space:]]-*|-*)
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read -r __arg1 __desc __junk <<EOF
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$line
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EOF
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case $__desc in -*)
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__arg1="$__arg1 $__desc"
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__desc=
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esac
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clean "$__desc${__junk:+ $__junk}"
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sect_opt="$sect_opt$nl.TP$nl$__arg1$nl$_fnr "
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;;
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[[:space:]]*)
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clean "$line"
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sect_opt="$sect_opt$_fnr "
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;;
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[[:print:]]*)
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clean "$line"
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sect_desc="$sect_desc$_fnr "
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;;
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esac
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done <<EOF
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$cmd_help
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EOF
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}
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get_includes() {
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case $_arg_include in '') return 0; esac
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exec 3<"$_arg_include"
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while read -r line <&3 || [ "$line" ] || {
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case $_hdr in *?*)
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fnr "$_hdr" ' ' _
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export "HELP_$_fnr=.SH \"$_hdr\"$nl$_buf"
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esac
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break
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}; do
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case $line in
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'['*']')
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case $_hdr in *?*)
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fnr "$_hdr" ' ' _
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export "HELP_$_fnr=.SH \"$_hdr\"$nl$_buf"
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esac
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fnr "$line" '[' '' ']' ''
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_hdr=$_fnr
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_buf=
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;;
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*?*) _buf=$_buf$line$nl ;;
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esac
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done
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}
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main() {
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set -e
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nl="
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"
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args "$@"
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get_help
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get_version
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cmd_date=$(date +'%B %Y')
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get_sections
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get_includes
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: "${HELP_NAME:=".SH NAME$nl$cmd_name ${_arg_name:+"\\- $_arg_name"}"}"
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: "${HELP_SYNOPSIS:="${sect_usage:+".SH SYNOPSIS$nl$sect_usage"}"}"
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: "${HELP_DESCRIPTION:="${sect_desc:+".SH DESCRIPTION$nl$sect_desc"}"}"
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: "${HELP_OPTIONS:="${sect_opt:+".SH OPTIONS$nl$sect_opt"}"}"
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: "${HELP_REPORTING_BUGS:="${sect_bug:+".SH \"REPORTING BUGS\"$nl$sect_bug"}"}"
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cat <<EOF > "${_arg_output:-/dev/stdout}"
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.\\" DO NOT MODIFY THIS FILE! It was generated by ${0##*/} 1.48.3.
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.TH $cmd_NAME "${_arg_section:-1}" "$cmd_date"\
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"${_arg_source:-$cmd_version_raw}" "${_arg_manual:-User Commands}"
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${HELP_NAME:+"$nl$HELP_NAME"}\
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${HELP_SYNOPSIS:+"$nl$HELP_SYNOPSIS"}\
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${HELP_DESCRIPTION:+"$nl$HELP_DESCRIPTION"}\
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${HELP_OPTIONS:+"$nl$HELP_OPTIONS"}\
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${HELP_REPORTING_BUGS:+"$nl$HELP_REPORTING_BUGS"}\
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${HELP_SEE_ALSO:+"$nl$HELP_SEE_ALSO"}
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EOF
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}
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main "$@"
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