column: use utf8_strnwidth() to strip out ANSI color escapes

Make use of utf8_strnwidth()'s feature to skip ANSI escape sequences
instead of open-coding it.  This shortens the code and makes it more
consistent.

This changes the behavior, though: The old code skips all kinds of
Control Sequence Introducer sequences, while utf8_strnwidth() only skips
the Select Graphic Rendition kind, i.e. those ending with "m".  They are
used for specifying color and font attributes like boldness.  The only
other kind of escape sequence we print in Git is Erase in Line, ending
with "K".  That's not used for columnar output, so this difference
actually doesn't matter here.

Signed-off-by: René Scharfe <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: rscharfe

column.c

@@ -23,18 +23,7 @@ struct column_data {
 /* return length of 's' in letters, ANSI escapes stripped */
 static int item_length(const char *s)
 {
-	int len, i = 0;
-	struct strbuf str = STRBUF_INIT;
-
-	strbuf_addstr(&str, s);
-	while ((s = strstr(str.buf + i, "\033[")) != NULL) {
-		int len = strspn(s + 2, "0123456789;");
-		i = s - str.buf;
-		strbuf_remove(&str, i, len + 3); /* \033[<len><func char> */
-	}
-	len = utf8_strwidth(str.buf);
-	strbuf_release(&str);
-	return len;
+	return utf8_strnwidth(s, -1, 1);
 }
 
 /*