X-Git-Url: http://git.tuebingen.mpg.de/?p=gsu.git;a=blobdiff_plain;f=funcs%2Fgsu;h=63e0acf7dfb705047efb1f4809c9af3282fbe9a3;hp=f53671774a36e5e4054ad227143f2ce0136b4071;hb=c54761ffae2f3fd24db97a447a6db5d90959a1d6;hpb=859161e1efa39afbb8368c8cf64f9d310aae69e7;ds=sidebyside

diff --git a/funcs/gsu b/funcs/gsu
index f536717..63e0acf 100644
--- a/funcs/gsu
+++ b/funcs/gsu
@@ -1,6 +1,6 @@
 #!/bin/bash
 # gsu -- the global subcommand utility
-# (C) 2006-2010 Andre Noll
+# (C) 2006-2011 Andre Noll
 
 _gsu_init_errors()
 {
@@ -15,6 +15,7 @@ E_GSU_BAD_OPTION_TYPE		invalid option type
 E_GSU_BAD_ARG_COUNT		invalid number of arguments
 E_GSU_EDITOR			failed to execute editor
 E_GSU_MKDIR			failed to create directory
+E_GSU_GETOPTS			getopts error
 $gsu_errors
 "
 	local a b i=0
@@ -136,13 +137,16 @@ _gsu_usage()
 }
 export -f _gsu_usage
 
+# Each line matching this is recognized as a subcommand. The name
+# of the subcommand is the first subexpression.
+export gsu_command_regex='^com_\([a-zA-Z_0-9]\+\)()'
+
 _gsu_available_commands()
 {
-	result="$( (printf "help\nman\nprefs\n"; grep "^com_[a-z_]\+()" $0) \
-		| sed -e 's/^com_//' -e 's/()//' \
-		| sort \
-		| tr '\n' ' ')"
-	ret=$GSU_SUCCESS
+	result="$({
+		printf "help\nman\nprefs\n"
+		sed -ne "s/$gsu_command_regex/\1/g;T;p" $0
+		} | sort | tr '\n' ' ')"
 }
 export -f _gsu_available_commands
 
@@ -280,13 +284,13 @@ _com_help()
 			printf "com_help()\n$gsu_help_txt" | head -n 4; echo "--"
 			printf "com_man()\n$gsu_man_txt" | head -n 4; echo "--"
 			printf "com_prefs()\n$gsu_prefs_txt" | head -n 4; echo "--"
-			grep -A 2 "^com_\([a-zA-Z_0-9]\+\)()" $0
+			grep -A 2 "$gsu_command_regex" $0
 		} | grep -v -- '--' \
-			| sed -e '/^com_\([a-zA-Z_0-9]\+\)()/bs' \
+			| sed -e "/$gsu_command_regex/bs" \
 				-e 'H;$!d;x;s/\n//g;b' \
 				-e :s \
 				-e 'x;s/\n//g;${p;x;}' \
-			| sed -e 's/^com_\([a-zA-Z_0-9]\+\)()#*/\1\t/' \
+			| sed -e "s/${gsu_command_regex}#*/\1\t/" \
 			| sort \
 			| while read a b; do
 				printf "$a\t"
@@ -377,7 +381,7 @@ _gsu_check_options()
 			return
 		esac
 
-		eval ${gsu_config_var_prefix}_$name='"'${val:=$default_value}'"'
+		eval ${gsu_config_var_prefix}_$name='"'\${val:=$default_value}'"'
 		# Check option type. ATM, only num and string are supported
 		# Other types may be added without breaking compatibility
 		case "$option_type" in
@@ -397,20 +401,96 @@ _gsu_check_options()
 }
 export -f _gsu_check_options
 
-gsu()
+# Wrapper for bash's getopts.
+#
+# Aborts on programming errors such as missing or invalid option string.  On
+# success $result contains shell code that can be eval'ed. For each defined
+# option x, the local variable o_x will be created when calling eval "$result".
+# o_x contains true/false for options without an argument or the emtpy string/the
+# given argument, depending on whether this option was contained in the "$@"
+# array.
+#
+# Example:
+# 	gsu_getopts abc:x:y
+# 	eval "$result"
+# 	[[ $ret -lt 0 ]] && return
+#
+# 	[[ "$o_a" = "true ]] && echo "The -a flag was given"
+# 	[[ -n "$o_c" ]] && echo "The -c option was given with arg $o_c"
+gsu_getopts()
 {
-	local i
+	local i c tab='	' cr='
+'
 
-	gsu_is_a_number "${BASH_VERSINFO[0]}"
+	gsu_check_arg_count $# 1 1
 	if [[ $ret -lt 0 ]]; then
-		gsu_msg "fatal: failed to determine bash version"
+		gsu_err_msg
 		exit 1
 	fi
 
-	if [[ "${BASH_VERSINFO[0]}" -lt 4 ]]; then
-		gsu_msg "fatal: This script requires at least bash 4.0"
+	ret=-$E_GSU_GETOPTS
+	result="invalid optstring $1"
+	if [[ -z "$1" ]] || grep -q '::' <<< "$1" ; then
+		gsu_err_msg
 		exit 1
 	fi
+
+	for ((i=0; i < ${#1}; i++)); do
+		c=${1:$i:1}
+		case "$c" in
+		[a-zA-Z:]);;
+		*)
+			ret=-$E_GSU_GETOPTS
+			result="invalid character $c in optstring"
+			gsu_err_msg
+			exit 1
+		esac
+	done
+	result="local opt"
+	for ((i=0; i < ${#1}; i++)); do
+		c1=${1:$i:1}
+		c2=${1:$(($i + 1)):1}
+		result+=" o_$c1"
+		if [[ "$c2" = ":" ]]; then
+			let i++
+		else
+			result+="=false"
+		fi
+	done
+	result+="
+	OPTIND=1
+	while getopts $1 opt \"\$@\"; do
+		case \"\$opt\" in
+"
+	for ((i=0; i < ${#1}; i++)); do
+		c1=${1:$i:1}
+		c2=${1:$(($i + 1)):1}
+		result+="$tab$tab$c1) o_$c1="
+		if [[ "$c2" = ":" ]]; then
+			result+="\"\$OPTARG\""
+			let i++
+		else
+			result+="true"
+		fi
+		result+=";;$cr"
+	done
+	result+="
+		*)
+			ret=-\$E_GSU_GETOPTS
+			result=\"invalid option given\"
+			return
+			;;
+		esac
+	done
+	shift \$((\$OPTIND - 1))
+"
+	ret=$GSU_SUCCESS
+}
+export -f gsu_getopts
+
+gsu()
+{
+	local i
 	_gsu_self="$(basename $0)"
 	gsu_name="${gsu_name:=$_gsu_self}"
 	gsu_config_var_prefix="${gsu_config_var_prefix:=$gsu_name}"