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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>
This commit is contained in:
Karthik Nayak 2015-09-10 21:18:19 +05:30 committed by Junio C Hamano
parent 574e96a241
commit 110dcda50d
2 changed files with 36 additions and 0 deletions
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21
utf8.c
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@ -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);
}

15
utf8.h
View File

@ -55,4 +55,19 @@ int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding);
*/
int is_hfs_dotgit(const char *path);
typedef enum {
ALIGN_LEFT,
ALIGN_MIDDLE,
ALIGN_RIGHT
} align_type;
/*
* Align the string given and store it into a strbuf as per the
* 'position' and 'width'. If the given string length is larger than
* 'width' than then the input string is not truncated and no
* alignment is done.
*/
void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
const char *s);
#endif