From: martin f. krafft <madduck@debian.org>
Date: Thu, 20 Nov 2008 11:31:09 +0000 (+0100)
Subject: implement a check function
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topgit.git;a=commitdiff_plain;h=26db970f2a1dedda0bc784474d592798e5267ea6

implement a check function

Signed-off-by: martin f. krafft <madduck@debian.org>
---

diff --git a/tg.sh b/tg.sh
index da3366d..258f8ce 100644
--- a/tg.sh
+++ b/tg.sh
@@ -235,24 +235,36 @@ do_help()
 	fi
 }
 
+# Check whether we are supposed to output the help message
+should_do_help()
+{
+	# we are being sourced for utility functions, never run help
+	[ -z "$tg__include" ] || return 1
+
+	local prev
+	while [ -n "$1" ]; do
+		case "$1" in
+		help|--help|-h)
+			shift
+			echo "${1:-$prev}"
+			return 0
+		esac
+		prev="$1"
+		shift
+	done
+
+	# run help when there was no previous topic, meaning that there where
+	# no arguments at all
+	test -z "$prev"
+}
 
 ## Startup
 
 [ -d "@cmddir@" ] ||
 	die "No command directory: '@cmddir@'"
 
-args_saved="$@"
-while [ -n "$1" ]; do
-	case "$1" in
-	help|--help|-h)
-		shift
-		do_help "$1"
-		exit 0;;
-	esac
-	shift
-done
-set -- $args_saved
-unset args_saved
+# check if we should run help and get the topic while we're at it
+help_topic="$(should_do_help "$@")" && { do_help "$help_topic"; exit 0; }
 
 ## Initial setup