Re: [PATCH] pager: config variable pager.color

[Junio C Hamano <junkio@cox.net>]

Juergen Ruehle <j.ruehle@bmiag.de> writes:

> AFAICS Matthias' patch has the added benefit of moving setup_pager to
> before large files (i.e. packs) are mapped. This helps non-COW-fork
> (i.e. cygwin) tremendously. Actually with Linus' setup refactoring
> this could probably be easily moved to the wrapper,...

Hmph.  Never thought about that.  Something like this?

-- >8 --
Builtins: control the use of pager from the command table.

This moves the built-in "always-use-pager" logic for log family
to the command dispatch table of git wrapper.  This makes it
easier to change the default use of pager, and has an added
benefit that we fork and exec the pager early before packs are
mmapped.

Pointed out by Juergen Ruehle <j.ruehle@bmiag.de>.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---
diff --git a/builtin-log.c b/builtin-log.c
index 82c69d1..bba1496 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -34,7 +34,6 @@ static int cmd_log_walk(struct rev_info 
 	struct commit *commit;
 
 	prepare_revision_walk(rev);
-	setup_pager();
 	while ((commit = get_revision(rev)) != NULL) {
 		log_tree_commit(rev, commit);
 		free(commit->buffer);
diff --git a/git.c b/git.c
index 7321d6c..d031eb9 100644
--- a/git.c
+++ b/git.c
@@ -211,6 +211,7 @@ static int handle_alias(int *argcp, cons
 const char git_version_string[] = GIT_VERSION;
 
 #define NEEDS_PREFIX 1
+#define USE_PAGER 2
 
 static void handle_internal_command(int argc, const char **argv, char **envp)
 {
@@ -218,13 +219,13 @@ static void handle_internal_command(int 
 	static struct cmd_struct {
 		const char *cmd;
 		int (*fn)(int, const char **, const char *);
-		int prefix;
+		int option;
 	} commands[] = {
 		{ "version", cmd_version },
 		{ "help", cmd_help },
-		{ "log", cmd_log, NEEDS_PREFIX },
-		{ "whatchanged", cmd_whatchanged, NEEDS_PREFIX },
-		{ "show", cmd_show, NEEDS_PREFIX },
+		{ "log", cmd_log, NEEDS_PREFIX | USE_PAGER },
+		{ "whatchanged", cmd_whatchanged, NEEDS_PREFIX | USE_PAGER },
+		{ "show", cmd_show, NEEDS_PREFIX | USE_PAGER },
 		{ "push", cmd_push },
 		{ "format-patch", cmd_format_patch, NEEDS_PREFIX },
 		{ "count-objects", cmd_count_objects },
@@ -275,8 +276,10 @@ static void handle_internal_command(int 
 			continue;
 
 		prefix = NULL;
-		if (p->prefix)
+		if (p->option & NEEDS_PREFIX)
 			prefix = setup_git_directory();
+		if (p->option & USE_PAGER)
+			setup_pager();
 		if (getenv("GIT_TRACE")) {
 			int i;
 			fprintf(stderr, "trace: built-in: git");