help--browse: add '--config' option to check a config option for a browser.

The value of this new command line option will be used as a key to
check the configuration for an help browser.

This should remove the last bit in 'git-help--browse' that was
specific to 'git-help', so that other git command can use
'git-help--browse'.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-help--browse.sh

@@ -16,7 +16,7 @@
 # git maintainer.
 #
 
-USAGE='[--browser=browser|--tool=browser] url/file ...'
+USAGE='[--browser=browser|--tool=browser] [--config=conf.var] url/file ...'
 
 # This must be capable of running outside of git directory, so
 # the vanilla git-sh-setup should not be used.
@@ -53,6 +53,18 @@ do
 		    shift ;;
 	    esac
 	    ;;
+	-c|--config*)
+	    case "$#,$1" in
+		*,*=*)
+		    conf=`expr "z$1" : 'z-[^=]*=\(.*\)'`
+		    ;;
+		1,*)
+		    usage ;;
+		*)
+		    conf="$2"
+		    shift ;;
+	    esac
+	    ;;
 	--)
 	    break
 	    ;;
@@ -70,15 +82,16 @@ test $# = 0 && usage
 
 if test -z "$browser"
 then
-    for opt in "help.browser" "web.browser"
+    for opt in "$conf" "web.browser"
     do
+	test -z "$opt" && continue
 	browser="`git config $opt`"
 	test -z "$browser" || break
     done
     if test -n "$browser" && ! valid_tool "$browser"; then
-	    echo >&2 "git config option $opt set to unknown browser: $browser"
+	echo >&2 "git config option $opt set to unknown browser: $browser"
-	    echo >&2 "Resetting to default..."
+	echo >&2 "Resetting to default..."
-	    unset browser
+	unset browser
     fi
 fi
 

help.c

@@ -347,7 +347,7 @@ static void show_html_page(const char *git_cmd)
 
 	get_html_page_path(&page_path, page);
 
-	execl_git_cmd("help--browse", page_path.buf, NULL);
+	execl_git_cmd("help--browse", "-c", "help.browser", page_path.buf, NULL);
 }
 
 void help_unknown_cmd(const char *cmd)