utf8: add function to align a string into given strbuf

Add strbuf_utf8_align() which will align a given string into a strbuf
as per given align_type and width. If the width is greater than the
string length then no alignment is performed.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/utf8.c b/utf8.c
index 28e6d76..00e10c8 100644
--- a/utf8.c
+++ b/utf8.c
@@ -644,3 +644,24 @@ int skip_utf8_bom(char **text, size_t len)
 	*text += strlen(utf8_bom);
 	return 1;
 }
+
+void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
+		       const char *s)
+{
+	int slen = strlen(s);
+	int display_len = utf8_strnwidth(s, slen, 0);
+	int utf8_compensation = slen - display_len;
+
+	if (display_len >= width) {
+		strbuf_addstr(buf, s);
+		return;
+	}
+
+	if (position == ALIGN_LEFT)
+		strbuf_addf(buf, "%-*s", width + utf8_compensation, s);
+	else if (position == ALIGN_MIDDLE) {
+		int left = (width - display_len) / 2;
+		strbuf_addf(buf, "%*s%-*s", left, "", width - left + utf8_compensation, s);
+	} else if (position == ALIGN_RIGHT)
+		strbuf_addf(buf, "%*s", width + utf8_compensation, s);
+}