WIP improved context-sensitive view-blob

[rolandwalker]

I would like to improve the sensitivity of some tig actions to their context.

This is expressed here as three TODO tests which call view-blob from the diff view.

Tig already adopts the model of context-sensitive action here, but it depends on the cursor directly touching a line which it can associate to a blob. When that is not true, tig opens the last blob it can remember, or opens the file finder.

Neither of those is likely to match user expectations. But when viewing a diff, the cursor is always either on a blob-associated line, or before some blob-associated line. So I propose that the simplest intuitive context-sensitive view-blob is

• view this line's blob, or failing that
• scan forward by lines and view the next associated blob

[jonas]

This makes sense and sounds like it will bring view-blob more in line with how the edit action works. However it is a bit hard to understand the behavior from only looking at the todo tests.

[rolandwalker]

I got as far as the following, which passes the included todos, but fails many others.

diff --git a/src/diff.c b/src/diff.c
index 583f1e0e0..29e002691 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -624,16 +624,16 @@ diff_get_pathname(struct view *view, struct line *line)
 	int i;

 	header = find_prev_line_by_type(view, line, LINE_DIFF_HEADER);
-	if (!header)
-		return NULL;

-	for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
-		dst = strstr(box_text(header), prefixes[i]);
-		if (dst)
-			return dst + strlen(prefixes[i]);
-	}
+	if (header)
+		for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
+			dst = strstr(box_text(header), prefixes[i]);
+			if (dst)
+				return dst + strlen(prefixes[i]);
+		}
+
+	header = find_next_line_by_type(view, header ? header : line, LINE_DIFF_ADD_FILE);

-	header = find_next_line_by_type(view, header, LINE_DIFF_ADD_FILE);
 	if (!header)
 		return NULL;