mailinfo: allow -u to fall back on latin1 to utf8 conversion.

When the message body does not identify what encoding it is in,
-u assumes it is in latin-1 and converts it to utf8, which is
the recommended encoding for git commit log messages.

With -u=<encoding>, the conversion is made into the specified
one, instead of utf8, to allow project-local policies.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/mailinfo.c b/mailinfo.c
index cb853df..6d8c933 100644 (file)
--- a/mailinfo.c
+++ b/mailinfo.c
@@ -16,7 +16,7 @@ extern char *gitstrcasestr(const char *haystack, const char *needle);
 static FILE *cmitmsg, *patchfile;
 
 static int keep_subject = 0;
-static int metainfo_utf8 = 0;
+static char *metainfo_charset = NULL;
 static char line[1000];
 static char date[1000];
 static char name[1000];
@@ -441,29 +441,38 @@ static int decode_b_segment(char *in, char *ot, char *ep)
 
 static void convert_to_utf8(char *line, char *charset)
 {
-       if (*charset) {
-               char *in, *out;
-               size_t insize, outsize, nrc;
-               char outbuf[4096]; /* cheat */
-               iconv_t conv = iconv_open("utf-8", charset);
-
-               if (conv == (iconv_t) -1) {
-                       fprintf(stderr, "cannot convert from %s to utf-8\n",
-                               charset);
+       char *in, *out;
+       size_t insize, outsize, nrc;
+       char outbuf[4096]; /* cheat */
+       static char latin_one[] = "latin-1";
+       char *input_charset = *charset ? charset : latin_one;
+       iconv_t conv = iconv_open(metainfo_charset, input_charset);
+
+       if (conv == (iconv_t) -1) {
+               static int warned_latin1_once = 0;
+               if (input_charset != latin_one) {
+                       fprintf(stderr, "cannot convert from %s to %s\n",
+                               input_charset, metainfo_charset);
                        *charset = 0;
-                       return;
                }
-               in = line;
-               insize = strlen(in);
-               out = outbuf;
-               outsize = sizeof(outbuf);
-               nrc = iconv(conv, &in, &insize, &out, &outsize);
-               iconv_close(conv);
-               if (nrc == (size_t) -1)
-                       return;
-               *out = 0;
-               strcpy(line, outbuf);
+               else if (!warned_latin1_once) {
+                       warned_latin1_once = 1;
+                       fprintf(stderr, "tried to convert from %s to %s, "
+                               "but your iconv does not work with it.\n",
+                               input_charset, metainfo_charset);
+               }
+               return;
        }
+       in = line;
+       insize = strlen(in);
+       out = outbuf;
+       outsize = sizeof(outbuf);
+       nrc = iconv(conv, &in, &insize, &out, &outsize);
+       iconv_close(conv);
+       if (nrc == (size_t) -1)
+               return;
+       *out = 0;
+       strcpy(line, outbuf);
 }
 
 static void decode_header_bq(char *it)
@@ -511,7 +520,7 @@ static void decode_header_bq(char *it)
                }
                if (sz < 0)
                        return;
-               if (metainfo_utf8)
+               if (metainfo_charset)
                        convert_to_utf8(piecebuf, charset_q);
                strcpy(out, piecebuf);
                out += strlen(out);
@@ -590,7 +599,7 @@ static int handle_commit_msg(void)
                 * normalize the log message to UTF-8.
                 */
                decode_transfer_encoding(line);
-               if (metainfo_utf8)
+               if (metainfo_charset)
                        convert_to_utf8(line, charset);
                fputs(line, cmitmsg);
        } while (fgets(line, sizeof(line), stdin) != NULL);
@@ -720,7 +729,9 @@ int main(int argc, char **argv)
                if (!strcmp(argv[1], "-k"))
                        keep_subject = 1;
                else if (!strcmp(argv[1], "-u"))
-                       metainfo_utf8 = 1;
+                       metainfo_charset = "utf-8";
+               else if (!strncmp(argv[1], "-u=", 3))
+                       metainfo_charset = argv[1] + 3;
                else
                        usage();
                argc--; argv++;