Add and document a global --no-pager option for git.

To keep the change small, this is done by setting GIT_PAGER to "cat".

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Brian Gernhardt <benji@silverinsanity.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git.txt

@@ -9,7 +9,8 @@ git - the stupid content tracker
 SYNOPSIS
 --------
 [verse]
-'git' [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate]
+'git' [--version] [--exec-path[=GIT_EXEC_PATH]]
+    [-p|--paginate|--no-pager]
     [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE]
     [--help] COMMAND [ARGS]
 
@@ -103,6 +104,9 @@ OPTIONS
 -p|--paginate::
 	Pipe all output into 'less' (or if set, $PAGER).
 
+--no-pager::
+	Do not pipe git output into a pager.
+
 --git-dir=<path>::
 	Set the path to the repository. This can also be controlled by
 	setting the GIT_DIR environment variable.

git.c

@@ -4,7 +4,7 @@
 #include "quote.h"
 
 const char git_usage_string[] =
-	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
+	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
 
 static void prepend_to_path(const char *dir, int len)
 {
@@ -58,6 +58,10 @@ static int handle_options(const char*** argv, int* argc, int* envchanged)
 			}
 		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 			setup_pager();
+		} else if (!strcmp(cmd, "--no-pager")) {
+			setenv("GIT_PAGER", "cat", 1);
+			if (envchanged)
+				*envchanged = 1;
 		} else if (!strcmp(cmd, "--git-dir")) {
 			if (*argc < 2) {
 				fprintf(stderr, "No directory given for --git-dir.\n" );