From 0d5de751e67f400dd1415992d08c84c08e477efa Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Thu, 20 Mar 2008 20:35:51 +0000
Subject: Implement a bunch of options, and only stay awake with --watch
 enabled.

---
 localwebgallerydaemon | 132 +++++++++++++++++++++++++++++++++++---------------
 1 file changed, 93 insertions(+), 39 deletions(-)

(limited to 'localwebgallerydaemon')

diff --git a/localwebgallerydaemon b/localwebgallerydaemon
index f0bc0d1..a43da53 100755
--- a/localwebgallerydaemon
+++ b/localwebgallerydaemon
@@ -3,18 +3,11 @@
 # /usr/local/bin/localwebgalleryupdate
 # Copyright 2008 Jonas Smedegaard <dr@jones.dk>
 #
-# $Id: localwebgallerydaemon,v 1.1 2008-03-18 23:22:03 jonas Exp $
+# $Id: localwebgallerydaemon,v 1.2 2008-03-20 20:35:51 jonas Exp $
 #
 # (Re)generate web gallery whenever source directory changes
 #
 # TODO: Implement options:
-#   --help
-#   --sourcedir
-#   --targetdir
-#   --run-once
-#   --now
-#   --verbose
-#   --debug
 #   --init (create targetdir if missing, fail if exists and non-empty)
 #
 # TODO: implement ask() and the following options:
@@ -23,11 +16,10 @@
 #
 # TODO: Support more gallery engines
 #
-# TODO: Support overriding defaults in rc-file
+# TODO: Support system-wide and per-user config overrides
 #
 
 set -e
-#set -bm
 
 # Defaults options
 SOURCEDIR="$HOME/public_media"
@@ -35,31 +27,31 @@ TARGETDIR="$HOME/public_html/gallery"
 GENERATOR="lazygal"
 THEME="image-index"
 
-# Use defaults if not overridden
-sourcedir="${1:-$SOURCEDIR}"
-targetdir="${2:-$TARGETDIR}"
-
 PRG=$(basename "$0")
 
-# Required external programs
-EXTPRG="/usr/bin/fileschanged"
-case $GENERATOR in
-    lazygal)
-    	EXTPRG="$EXTPRG /usr/bin/$GENERATOR"
-	;;
-esac
-
 showhelp() {
 	cat <<EOF
-Usage:   $PRG [ SOURCEDIR ] [ TARGETDIR ]
+Usage:   $PRG [ SOURCEDIR [ TARGETDIR ] ]
+
+Options:
+  -g, --generator Gallery generator to use (default: $GENERATOR)
+  -w, --watch     Watch source, updating each time something changes
+  -n, --now       Update once
+  -v, --verbose   Print activities to stderr while running
+  -h, --help      This text
 
-Defaults:
-    SOURCEDIR:  $SOURCEDIR
-    TARGETDIR:  $TARGETDIR
+The following directories are used if not provided on commandline:
+    SOURCEDIR: $SOURCEDIR
+    TARGETDIR: $TARGETDIR
+
+If --watch is not supplied, --now is implied.
+
+Use --generator=list to get a list of locally supported generators.
 
 Examples:
-    $PRG ~/my/images /var/www/gallery &
-    daemon -u me -n gallery-me -- $PRG ~/my/images /var/www/gallery
+    $PRG ~/my/images /var/www/gallery
+    daemon -u me -n gallery-me -- $PRG --watch
+
 EOF
 }
 
@@ -69,31 +61,91 @@ exit1()	{
 	exit 1
 }
 
-lazygal_opts="--quiet --check-all-dirs --clean-destination ${THEME:+--theme $THEME}"
+TEMP="`getopt -s sh -o g:wnvh -l generator:,watch,now,verbose,help -n "$PRG" -- "$@"`"
+if [ $? != 0 ] ; then exit1 " Internal getopt error."; fi
+eval set -- "$TEMP"
+
+watch=
+now=
+verbose=
+while true ; do
+	case "$1" in
+		-g|--generator) generator="$2"; shift 2;;
+		-w|--watch) watch="yes"; shift;;
+		-n|--now) now="yes"; shift;;
+		-v|--verbose) verbose="yes"; shift;;
+		-h|--help) showhelp; exit 0;;
+		--) shift; break;;
+		*) exit1 "Internal error resolving options.";;
+	esac
+done
+
+# Use defaults if not overridden
+generator="${generator:-$GENERATOR}"
+sourcedir="${1:-$SOURCEDIR}"
+targetdir="${2:-$TARGETDIR}"
+
+generators="lazygal"
+if [ "list" = "$generator" ]; then
+	echo "The following gallery generators are supported on this system:"
+	echo
+	for generator in $generators; do
+		if which $generator >/dev/null; then
+			echo "    $generator"
+		fi
+	done
+	echo
+exit 0
+fi
+
+# Check if generator is supported and declare needed external programs
+case $generator in
+	lazygal) which "$generator" >/dev/null \
+		|| exit1 "Unsupported generator \"$generator\" (try --generator=list).";;
+	*) exit1 "Unsupported generator \"$generator\".";;
+esac
+
+# Static defaults
+lazygal_opts="--quiet --check-all-dirs --clean-destination"
+lazygal_theme_opts="${THEME:+--theme $THEME}"
 
 # Sanity checks
 [ -d "$sourcedir" ] || exit1 "Source directory \"$sourcedir\" is not a directory"
 [ -d "$targetdir" ] || exit1 "Target directory \"$targetdir\" is not a directory"
-for prg in $EXTPRG; do
-	[ -x "$prg" ] || exit1 "Required program \"$prg\" not installed"
-done
+[ -z "$watch" ] || which fileschanged >/dev/null \
+	|| exit1 "Helper tool \"fileschanged\" needed for --watch mode is unavailable."
 
+# TODO: Make it work to signal status to parent proces
+#trap 'echo >&2 "Starting gallery update as requested."' USR1
 updategallery() {
 	onemoretime=yes
 	trap 'onemoretime=yes' USR1
 	while [ -n "$onemoretime" ]; do
+#		[ -z "$verbose" ] || kill -USR1 $PPID
 		onemoretime=
-		case "$GENERATOR" in
+		case "$generator" in
 		    lazygal)
-			lazygal $lazygal_opts -o "$targetdir" "$sourcedir"
+			lazygal $lazygal_opts $lazygal_theme_opts -o "$targetdir" "$sourcedir"
 			;;
 		esac
-		sleep 10
+		[ "--once" = "$1" ] || sleep 10
 	done
 }
 
-pid=
-fileschanged -r -s created,changed,deleted "$sourcedir" | while read file; do
+started=
+# Update immediately if requested or if watch mode isn't requested
+if [ -n "$now" ] || [ -z "$watch" ]; then
+	if [ -z "$watch" ]; then
+		[ -z "$verbose" ] || echo >&2 "Starting gallery update once."
+		updategallery --once
+	else
+		started=yes
+		[ -z "$verbose" ] || echo >&2 "Starting gallery update before invoking watch mode."
+		updategallery &
+	fi
+fi
+[ -z "$watch" ]	|| [ -z "$verbose" ] || echo >&2 "Invoking watch mode."
+[ -z "$watch" ] || fileschanged -r -s created,changed,deleted "$sourcedir" | while read file; do
 
 	# Ignore hidden files (used for temporary files by rsync)
 	case "$file" in
@@ -103,8 +155,10 @@ fileschanged -r -s created,changed,deleted "$sourcedir" | while read file; do
 	esac
 
 	# Invoke update if not active or telling to take another spin fails
-	if [ -z "$progress" ] || ! kill -USR1 $(jobs -p) 2>/dev/null; then
-		progress=yes
+	[ -z "$verbose" ] || echo >&2 "Update request triggered by \"$file\""
+	if [ -z "$started" ] || ! kill -USR1 $(jobs -p) 2>/dev/null; then
+		started=yes
+		[ -z "$verbose" ] || echo >&2 "Request gallery update."
 		updategallery &
 	fi
 done
-- 
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