emit_line_0 has no nested conditions, but puts out all its arguments
(if set) in order. There is still a slight confusion with set
and set_sign, but let's defer that to a later patch.
'first' used be output always no matter if it was 0, but that got lost
at "diff: add an internal option to dual-color diffs of diffs",
2018-07-21), as there we broadened the meaning of 'first' to also
signal an early return.
The change in 'emit_line' makes sure that 'first' is never content, but
always under our control, a sign or special character in the beginning
of the line (or 0, in which case we ignore it).
Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
diff.c | 73 +++++++++++++++++++++++++++++++++-------------------------
1 file changed, 41 insertions(+), 32 deletions(-)
diff --git a/diff.c b/diff.c
index f565a2c0c2b..2bd4d3d6839 100644
--- a/diff.c
+++ b/diff.c
@@ -580,43 +580,52 @@ static void emit_line_0(struct diff_options *o,
int first, const char *line, int len)
{
int has_trailing_newline, has_trailing_carriage_return;
- int nofirst;
int reverse = !!set && !!set_sign;
+ int needs_reset = 0;
+
FILE *file = o->file;
fputs(diff_line_prefix(o), file);
- if (len == 0) {
- has_trailing_newline = (first == '\n');
- has_trailing_carriage_return = (!has_trailing_newline &&
- (first == '\r'));
- nofirst = has_trailing_newline || has_trailing_carriage_return;
- } else {
- has_trailing_newline = (len > 0 && line[len-1] == '\n');
- if (has_trailing_newline)
- len--;
- has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
- if (has_trailing_carriage_return)
- len--;
- nofirst = 0;
- }
-
- if (len || !nofirst) {
- if (reverse && want_color(o->use_color))
- fputs(GIT_COLOR_REVERSE, file);
- if (set_sign || set)
- fputs(set_sign ? set_sign : set, file);
- if (first && !nofirst)
- fputc(first, file);
- if (len) {
- if (set_sign && set && set != set_sign)
- fputs(reset, file);
- if (set)
- fputs(set, file);
- fwrite(line, len, 1, file);
- }
- fputs(reset, file);
+ has_trailing_newline = (len > 0 && line[len-1] == '\n');
+ if (has_trailing_newline)
+ len--;
+
+ has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
+ if (has_trailing_carriage_return)
+ len--;
+
+ if (!len && !first)
+ goto end_of_line;
+
+ if (reverse && want_color(o->use_color)) {
+ fputs(GIT_COLOR_REVERSE, file);
+ needs_reset = 1;
+ }
+
+ if (set_sign || set) {
+ fputs(set_sign ? set_sign : set, file);
+ needs_reset = 1;
}
+
+ if (first)
+ fputc(first, file);
+
+ if (!len)
+ goto end_of_line;
+
+ if (set) {
+ if (set_sign && set != set_sign)
+ fputs(reset, file);
+ fputs(set, file);
+ needs_reset = 1;
+ }
+ fwrite(line, len, 1, file);
+ needs_reset |= len > 0;
+
+end_of_line:
+ if (needs_reset)
+ fputs(reset, file);
if (has_trailing_carriage_return)
fputc('\r', file);
if (has_trailing_newline)
@@ -626,7 +635,7 @@ static void emit_line_0(struct diff_options *o,
static void emit_line(struct diff_options *o, const char *set, const char *reset,
const char *line, int len)
{
- emit_line_0(o, set, NULL, reset, line[0], line+1, len-1);
+ emit_line_0(o, set, NULL, reset, 0, line, len);
}
enum diff_symbol {
--
2.18.0.132.g195c49a2227
