#!/bin/sh
#
-# Copyright © 2019 Nick Bowler
+# Copyright © 2019-2020 Nick Bowler
#
# Generate thumbnails for cover art retrieved from MPD.
#
: "${THUMBNAILDIR=$XDG_CACHE_HOME/mpdthumb}"
# Try to find mpdexec...
-case $0 in
-/*) self=$0 ;;
-*/*) self=$PWD/${0#./} ;;
-*) self=`command -v $0` ;;
+argv0=$0
+case $argv0 in
+/*) self=$argv0 ;;
+*/*) self=$PWD/${argv0#./} ;;
+*) self=`command -v $argv0` ;;
esac
owndir=${self%/*}
: "${CONVERT=convert}"
fi
-size=x128
+print_version () {
+ cat <<'EOF'
+mpdthumb.sh 0.8
+Copyright © 2020 Nick Bowler
+License GPLv3+: GNU General Public License version 3 or any later version.
+This is free software: you are free to change and redistribute it.
+There is NO WARRANTY, to the extent permitted by law.
+EOF
+}
+
+print_usage () {
+ test $# -eq 0 || { printf '%s: ' "$argv0"; printf "$@"; }
+ printf 'Usage: %s [options] file [file ...]\n' "$argv0"
+ test $# -eq 0 || printf 'Try %s --help for more information.\n' "$argv0"
+}
+
+print_help () {
+ print_usage
+ cat <<EOF
+This is "mpdthumb": a tool to retrieve cover art thumbnails from MPD.
+
+One or more filenames may be specified. The cover art (if any) for each
+file is retrieved and scaled to the requested size. The thumbnails are
+cached locally so that subsequent lookups return results very quickly.
+
+The filenames of the generated thumbnails are printed one per line in
+the same order of the associated files specified on the command line.
+If a given file has no cover art, then a blank line is printed.
+
+Options:
+ --size=[W][xH] Specify the dimensions (in pixels) of a bounding rectangle
+ into which the image will be scaled to fit. One (but not
+ both) of the dimensions may be omitted to indicate no limit
+ in that direction. The default size is x128.
+ --small Equivalent to --size=56
+ --version Print a version message and then exit.
+ --help Print this message and then exit.
+
+Report bugs to <nbowler@draconx.ca>.
+EOF
+}
+size=x128
lastarg=
dashdash=
for arg; do
--size=*) size=${arg#--size=} ;;
--small) size=56 ;;
--size) lastarg=$arg ;;
+ --version) print_version; exit ;;
+ --help) print_help; exit ;;
--) dashdash=: ;;
- -*) printf '%s: unrecognized argument: %s\n' "$0" "$arg" 1>&2; exit 1 ;;
+ -*) print_usage 'unrecognized argument: %s\n' "$arg" 1>&2; exit 1 ;;
*) set x "$@" "$arg"; shift
esac
w=${size%x*} h=${size#*x}
if expr "$w$h" : '[0-9][0-9]*$' >/dev/null; then :; else
- printf '%s: invalid --size setting: %s\n' "$0" "$size" 1>&2
+ print_usage 'invalid --size setting: %s\n' "$size" 1>&2
exit 1
fi
case $# in 0)
- printf 'usage: %s [options] file [file ...]\n' "$0" 1>&2
+ print_usage 'at least one filename is required\n' 1>&2
exit 1
esac
arg=${arg%/*}/
shift; set x "$@" "$arg"; shift
- printf '%s\n' "$arg" | sed '/[ \\"]/ {
+ printf '%s\n' "$arg" | sed '/[ \\"'\'']/ {
s/[\\"]/\\&/g
s/.*/"&"/
}