diff.c: add emit_del_line() and emit_context_line()
Traditionally, we only had emit_add_line() helper, which knows how
to find and paint whitespace breakages on the given line, because we
only care about whitespace breakages introduced in new lines. The
context lines and old (i.e. deleted) lines are emitted with a
simpler emit_line_0() that paints the entire line in plain or old
colors.
Identify callers of emit_line_0() that show deleted lines and
context lines, have them call new helpers, emit_del_line() and
emit_context_line(), so that we can later tweak what is done to
these two classes of lines.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/diff.c b/diff.c
index d1bd534..c575c45 100644
--- a/diff.c
+++ b/diff.c
@@ -498,6 +498,24 @@
}
}
+static void emit_del_line(const char *reset,
+ struct emit_callback *ecbdata,
+ const char *line, int len)
+{
+ const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_OLD);
+
+ emit_line_0(ecbdata->opt, set, reset, '-', line, len);
+}
+
+static void emit_context_line(const char *reset,
+ struct emit_callback *ecbdata,
+ const char *line, int len)
+{
+ const char *set = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
+
+ emit_line_0(ecbdata->opt, set, reset, ' ', line, len);
+}
+
static void emit_hunk_header(struct emit_callback *ecbdata,
const char *line, int len)
{
@@ -603,7 +621,6 @@
{
const char *endp = NULL;
static const char *nneof = " No newline at end of file\n";
- const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
while (0 < size) {
@@ -613,8 +630,7 @@
len = endp ? (endp - data + 1) : size;
if (prefix != '+') {
ecb->lno_in_preimage++;
- emit_line_0(ecb->opt, old, reset, '-',
- data, len);
+ emit_del_line(reset, ecb, data, len);
} else {
ecb->lno_in_postimage++;
emit_add_line(reset, ecb, data, len);
@@ -1250,17 +1266,27 @@
return;
}
- if (line[0] != '+') {
- const char *color =
- diff_get_color(ecbdata->color_diff,
- line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
- ecbdata->lno_in_preimage++;
- if (line[0] == ' ')
- ecbdata->lno_in_postimage++;
- emit_line(ecbdata->opt, color, reset, line, len);
- } else {
+ switch (line[0]) {
+ case '+':
ecbdata->lno_in_postimage++;
emit_add_line(reset, ecbdata, line + 1, len - 1);
+ break;
+ case '-':
+ ecbdata->lno_in_preimage++;
+ emit_del_line(reset, ecbdata, line + 1, len - 1);
+ break;
+ case ' ':
+ ecbdata->lno_in_postimage++;
+ ecbdata->lno_in_preimage++;
+ emit_context_line(reset, ecbdata, line + 1, len - 1);
+ break;
+ default:
+ /* incomplete line at the end */
+ ecbdata->lno_in_preimage++;
+ emit_line(ecbdata->opt,
+ diff_get_color(ecbdata->color_diff, DIFF_PLAIN),
+ reset, line, len);
+ break;
}
}
