[PATCH] diff: handle lines containing only whitespace better

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When a line contains nothing but whitespace and the core.whitespace config
option contains blank-at-eol, the whitespace on the line is being printed
twice, once unhighlighted (unless otherwise matched by one of the other
core.whitespace values), and a second time highlighted for blank-at-eol.

Update the leading indentation check to stop checking when it reaches
the trailing whitespace.

Signed-off-by: Kevin Ballard <kevin@xxxxxx>
---
 ws.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/ws.c b/ws.c
index d7b8c33..7302f8f 100644
--- a/ws.c
+++ b/ws.c
@@ -174,8 +174,11 @@ static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
 		}
 	}
 
+	if (trailing_whitespace == -1)
+		trailing_whitespace = len;
+
 	/* Check indentation */
-	for (i = 0; i < len; i++) {
+	for (i = 0; i < trailing_whitespace; i++) {
 		if (line[i] == ' ')
 			continue;
 		if (line[i] != '\t')
@@ -218,8 +221,6 @@ static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
 		 * Now the rest of the line starts at "written".
 		 * The non-highlighted part ends at "trailing_whitespace".
 		 */
-		if (trailing_whitespace == -1)
-			trailing_whitespace = len;
 
 		/* Emit non-highlighted (middle) segment. */
 		if (trailing_whitespace - written > 0) {
-- 
1.7.3.1.211.g81fee.dirty

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