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#!/usr/bin/env bash
# This may be included with or without `set -euE`
# Copyright (C) 2011 Joshua Ismael Haase Hernández (xihh) <hahj87@gmail.com>
# Copyright (C) 2012 Nicolás Reynolds <fauno@parabola.nu>
# Copyright (C) 2012-2014, 2016 Luke Shumaker <lukeshu@sbcglobal.net>
#
# For just the setup_traps() function:
# Copyright (C) 2002-2006 Judd Vinet <jvinet@zeroflux.org>
# Copyright (C) 2006-2010 Pacman Development Team <pacman-dev@archlinux.org>
# Copyright (C) 2005 Aurelien Foret <orelien@chez.com>
# Copyright (C) 2005 Christian Hamar <krics@linuxforum.hu>
# Copyright (C) 2006 Alex Smith <alex@alex-smith.me.uk>
# Copyright (C) 2006 Andras Voroskoi <voroskoi@frugalware.org>
# Copyright (C) 2006 Miklos Vajna <vmiklos@frugalware.org>
#
# License: GNU GPLv2+
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
################################################################################
# Inherit most functions from devtools #
################################################################################
. "$(librelib common)"
################################################################################
# Own functions #
################################################################################
# Usage: panic
#
# For programming errors, bails immediately with little fanfare.
panic() {
echo "$(_l _ 'panic: malformed call to internal function')" >&2
exit 1
}
# Usage: print MESG [ARGS...]
#
# Like printf, but gettext-aware, and prints a trailing newline
print() {
[[ $# -ge 1 ]] || panic
local mesg="$(_ "$1")"
shift
printf -- "$mesg\n" "$@"
}
# Usage: whitespace_collapse <<<STRING
#
# Collapses whitespace on stadard I/O, similar to HTML whitespace
# collapsing, with the exception that it puts two spaces between
# sentences. It considers newline, tab, and space to be whitespace.
whitespace_collapse() {
[[ $# == 0 ]] || panic
tr '\n' '\r' | sed -r \
-e 's/\r/ /g' -e 's/\t/ /g' \
-e 's/(^|[^.!? ]) +/\1 /g' -e 's/([.!?]) +/\1 /g'
}
# Usage: prose MESG [ARGS...]
#
# Do HTML-style whitespace collapsing on the first argument, translate
# it (gettext), then word-wrap it to 75 columns. This is useful for
# printing a paragraph of prose in --help text.
prose() {
[[ $# -ge 1 ]] || panic
local mesg="$(_ "$(whitespace_collapse <<<"$1")")"; shift
printf -- "$mesg" "$@" | fmt -u
}
# Usage: bullet MESG [ARGS...]
# Like prose, but print a bullet "-" before the first line, and indent the
# remaining lines.
bullet() {
[[ $# -ge 1 ]] || panic
local mesg="$(_ "$(whitespace_collapse <<<"$1")")"; shift
# Wrap the text to 71 columns; 75 (the default) minus a 4 column indent
printf -- "$mesg" "$@" | fmt -u -w 71 | sed -e '1s/^/ - /' -e '2,$s/^/ /'
}
# Usage: flag [FLAG DESCRIPTION|HEADING:]...
#
# Print a flag and description formatted for --help text.
#
# ex: flag '-C <FILE>' 'Use this file instead of pacman.conf'
#
# The descriptions and headings are fed through gettext, the flags ar
# not, so if part of a flag needs to be translated, you must do that
# yourself:
#
# ex: flag "-C <$(_ FILE)>" 'Use this file instead of pacman.conf'
#
# If you want to line-break the description in the source, so it isn't
# crazy-long, feel free, it is reflowed/wrapped the same way as prose
# and bullet. If you pass in multiple flag/description pairs at once,
# the descriptions are all alligned together.
#
# A heading MUST end with a colon (':'), this is how it knows that it
# is a heading. Similarly, a flag MUST NOT end with a colon.
flag() {
local args=("$@")
declare -i flaglen=0
while [[ $# -gt 0 ]]; do
if [[ $1 == *: ]]; then
shift 1
else
if [[ ${#1} -gt $flaglen ]]; then
flaglen=${#1}
fi
shift 2
fi
done
set -- "${args[@]}"
# Unless the $flaglen is extra-wide, the $desc should start at
# column 16 (that is two literal-tabs). If $flaglen is wide,
# this should be increased in increments of 8 (that is, a
# literal-tab). Everything should be wrapped to 75 columns.
# The printf-format we use has 4 spaces built into it (two at
# the beginning, and two for a seperator). Therefore, the
# default indent is 16-4=12 columns. And the width left for
# $desc is (75-4)-indent = 71-indent.
declare -i indent=12
while [[ $indent -lt $flaglen ]]; do
indent+=8
done
local fmt2 fmt1
fmt2=" %-${indent}s %s\n"
printf -v fmt1 " %-${indent}s %%s\n" ''
while [[ $# -gt 0 ]]; do
if [[ $1 == *: ]]; then
printf -- ' %s\n' "$(_ "$1")"
shift
else
[[ $# -gt 1 ]] || panic
local flag=$1
local desc="$(_ "$(whitespace_collapse <<<"$2")")"
shift 2
local lines
IFS=$'\n' lines=($(fmt -u -w $((71-indent)) <<<"$desc"))
printf -- "$fmt2" "$flag" "${lines[0]}"
[[ ${#lines[@]} -lt 2 ]] || printf -- "$fmt1" "${lines[@]:1}"
fi
done
}
# Usage: term_title MESG [ARGS...]
#
# Sets the terminal title.
term_title() {
[[ $# -ge 1 ]] || panic
local fmt=''
case "$TERM" in
screen|tmux) fmt='\ek%s\e\\';;
xterm*|rxvt*) fmt='\e]0;%s\a';;
esac
printf "$fmt" "$(printf -- "$@")"
}
# Usage: setup_traps [handler]
#
# Sets up traps on TERM, HUP, QUIT and INT signals, as well as the ERR
# event, similar to makepkg.
#
# If `handler` is specified, instead of using the default handler
# (which is good for most purposes), it will call the command handler
# with the arguments:
#
# ${handler} SIGNAL_NAME MESSAGE_FMT [MESSAGE_PARAMS...]
#
# where MESSAGE_* are printf-like stuff.
#
# This function is based on code from pacman:makepkg
setup_traps() {
[[ $# -le 1 ]] || panic
if [[ $# == 1 ]]; then
eval "_libremessages_trap_exit() { $1 \"\$@\"; }"
else
_libremessages_trap_exit() {
local signal=$1; shift
echo
error "$@"
trap -- "$signal"
kill "-$signal" "$$"
}
fi
set -E
for signal in TERM HUP QUIT; do
trap "_libremessages_trap_exit $signal '%s signal caught. Exiting...' $signal" $signal
done
trap '_libremessages_trap_exit INT "Aborted by user! Exiting..."' INT
trap '_libremessages_trap_exit USR1 "An unknown error has occurred. Exiting..."' ERR
}
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