From 04b1febd46b3edf2c47ad5d39d6b974bda7ec071 Mon Sep 17 00:00:00 2001
From: Jonas Fonseca <fonseca@diku.dk>
Date: Tue, 22 Jun 2010 22:52:58 -0400
Subject: [PATCH] Fall back to retry if no diff will be shown

This can happen if a file spec was passed on the command line and
the diff view is opened from the blame view with a different path.
---
 NEWS  |  8 ++++++++
 tig.c | 29 ++++++++++++++++++++++++++++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/NEWS b/NEWS
index af9312d..41729f7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,14 @@
 Release notes
 =============
 
+tig master
+----------
+
+Bug fixes:
+
+ - Fix problem with empty diff views when file specs were passed on the
+   command line.
+
 tig-0.16
 --------
 
diff --git a/tig.c b/tig.c
index e2e83ff..5f4c263 100644
--- a/tig.c
+++ b/tig.c
@@ -4194,11 +4194,38 @@ static const char *diff_argv[SIZEOF_ARG] = {
 		"%(diffargs)", "%(commit)", "--", "%(fileargs)", NULL
 };
 
+static bool
+diff_read(struct view *view, char *data)
+{
+	if (!data) {
+		/* Fall back to retry if no diff will be shown. */
+		if (view->lines == 0 && opt_file_args) {
+			int pos = argv_size(view->argv)
+				- argv_size(opt_file_args) - 1;
+
+			if (pos > 0 && !strcmp(view->argv[pos], "--")) {
+				for (; view->argv[pos]; pos++) {
+					free((void *) view->argv[pos]);
+					view->argv[pos] = NULL;
+				}
+
+				if (view->pipe)
+					io_done(view->pipe);
+				if (io_run(&view->io, IO_RD, view->dir, view->argv))
+					return FALSE;
+			}
+		}
+		return TRUE;
+	}
+
+	return pager_read(view, data);
+}
+
 static struct view_ops diff_ops = {
 	"line",
 	diff_argv,
 	NULL,
-	pager_read,
+	diff_read,
 	pager_draw,
 	pager_request,
 	pager_grep,
-- 
2.30.2