Move 'builtin-*' into a 'builtin/' subdirectory

This shrinks the top-level directory a bit, and makes it much more
pleasant to use auto-completion on the thing. Instead of

	[torvalds@nehalem git]$ em buil<tab>
	Display all 180 possibilities? (y or n)
	[torvalds@nehalem git]$ em builtin-sh
	builtin-shortlog.c     builtin-show-branch.c  builtin-show-ref.c
	builtin-shortlog.o     builtin-show-branch.o  builtin-show-ref.o
	[torvalds@nehalem git]$ em builtin-shor<tab>
	builtin-shortlog.c  builtin-shortlog.o
	[torvalds@nehalem git]$ em builtin-shortlog.c

you get

	[torvalds@nehalem git]$ em buil<tab>		[type]
	builtin/   builtin.h
	[torvalds@nehalem git]$ em builtin		[auto-completes to]
	[torvalds@nehalem git]$ em builtin/sh<tab>	[type]
	shortlog.c     shortlog.o     show-branch.c  show-branch.o  show-ref.c     show-ref.o
	[torvalds@nehalem git]$ em builtin/sho		[auto-completes to]
	[torvalds@nehalem git]$ em builtin/shor<tab>	[type]
	shortlog.c  shortlog.o
	[torvalds@nehalem git]$ em builtin/shortlog.c

which doesn't seem all that different, but not having that annoying
break in "Display all 180 possibilities?" is quite a relief.

NOTE! If you do this in a clean tree (no object files etc), or using an
editor that has auto-completion rules that ignores '*.o' files, you
won't see that annoying 'Display all 180 possibilities?' message - it
will just show the choices instead.  I think bash has some cut-off
around 100 choices or something.

So the reason I see this is that I'm using an odd editory, and thus
don't have the rules to cut down on auto-completion.  But you can
simulate that by using 'ls' instead, or something similar.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/builtin/var.c b/builtin/var.c
new file mode 100644
index 0000000000..2280518190
--- /dev/null
+++ b/builtin/var.c
@@ -0,0 +1,99 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Eric Biederman, 2005
+ */
+#include "cache.h"
+#include "exec_cmd.h"
+
+static const char var_usage[] = "git var [-l | <variable>]";
+
+static const char *editor(int flag)
+{
+	const char *pgm = git_editor();
+
+	if (!pgm && flag & IDENT_ERROR_ON_NO_NAME)
+		die("Terminal is dumb, but EDITOR unset");
+
+	return pgm;
+}
+
+static const char *pager(int flag)
+{
+	const char *pgm = git_pager();
+
+	if (!pgm)
+		pgm = "cat";
+	return pgm;
+}
+
+struct git_var {
+	const char *name;
+	const char *(*read)(int);
+};
+static struct git_var git_vars[] = {
+	{ "GIT_COMMITTER_IDENT", git_committer_info },
+	{ "GIT_AUTHOR_IDENT",   git_author_info },
+	{ "GIT_EDITOR", editor },
+	{ "GIT_PAGER", pager },
+	{ "", NULL },
+};
+
+static void list_vars(void)
+{
+	struct git_var *ptr;
+	const char *val;
+
+	for (ptr = git_vars; ptr->read; ptr++)
+		if ((val = ptr->read(0)))
+			printf("%s=%s\n", ptr->name, val);
+}
+
+static const char *read_var(const char *var)
+{
+	struct git_var *ptr;
+	const char *val;
+	val = NULL;
+	for (ptr = git_vars; ptr->read; ptr++) {
+		if (strcmp(var, ptr->name) == 0) {
+			val = ptr->read(IDENT_ERROR_ON_NO_NAME);
+			break;
+		}
+	}
+	return val;
+}
+
+static int show_config(const char *var, const char *value, void *cb)
+{
+	if (value)
+		printf("%s=%s\n", var, value);
+	else
+		printf("%s\n", var);
+	return git_default_config(var, value, cb);
+}
+
+int cmd_var(int argc, const char **argv, const char *prefix)
+{
+	const char *val;
+	int nongit;
+	if (argc != 2) {
+		usage(var_usage);
+	}
+
+	setup_git_directory_gently(&nongit);
+	val = NULL;
+
+	if (strcmp(argv[1], "-l") == 0) {
+		git_config(show_config, NULL);
+		list_vars();
+		return 0;
+	}
+	git_config(git_default_config, NULL);
+	val = read_var(argv[1]);
+	if (!val)
+		usage(var_usage);
+
+	printf("%s\n", val);
+
+	return 0;
+}