blame: show "previous" information in --porcelain/--incremental format

diff --git a/ws.c b/ws.c
index ba7e834ca819b1d2ccce6cf125aa9f34efea8d5c..b1efcd9d753a29d295702b36fb1beba58fb16995 100644 (file)
--- a/ws.c
+++ b/ws.c
@@ -99,8 +99,7 @@ unsigned whitespace_rule(const char *pathname)
 /* The returned string should be freed by the caller. */
 char *whitespace_error_string(unsigned ws)
 {
-       struct strbuf err;
-       strbuf_init(&err, 0);
+       struct strbuf err = STRBUF_INIT;
        if (ws & WS_TRAILING_SPACE)
                strbuf_addstr(&err, "trailing whitespace");
        if (ws & WS_SPACE_BEFORE_TAB) {
@@ -117,9 +116,9 @@ char *whitespace_error_string(unsigned ws)
 }
 
 /* If stream is non-NULL, emits the line after checking. */
-unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
-                            FILE *stream, const char *set,
-                            const char *reset, const char *ws)
+static unsigned ws_check_emit_1(const char *line, int len, unsigned ws_rule,
+                               FILE *stream, const char *set,
+                               const char *reset, const char *ws)
 {
        unsigned result = 0;
        int written = 0;
@@ -213,6 +212,33 @@ unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
        return result;
 }
 
+void ws_check_emit(const char *line, int len, unsigned ws_rule,
+                  FILE *stream, const char *set,
+                  const char *reset, const char *ws)
+{
+       (void)ws_check_emit_1(line, len, ws_rule, stream, set, reset, ws);
+}
+
+unsigned ws_check(const char *line, int len, unsigned ws_rule)
+{
+       return ws_check_emit_1(line, len, ws_rule, NULL, NULL, NULL, NULL);
+}
+
+int ws_blank_line(const char *line, int len, unsigned ws_rule)
+{
+       /*
+        * We _might_ want to treat CR differently from other
+        * whitespace characters when ws_rule has WS_CR_AT_EOL, but
+        * for now we just use this stupid definition.
+        */
+       while (len-- > 0) {
+               if (!isspace(*line))
+                       return 0;
+               line++;
+       }
+       return 1;
+}
+
 /* Copy the line to the buffer while fixing whitespaces */
 int ws_fix_copy(char *dst, const char *src, int len, unsigned ws_rule, int *error_count)
 {