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>

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];
@@ -441,16 +441,26 @@ 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);
+	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) {
-			fprintf(stderr, "cannot convert from %s to utf-8\n",
-				charset);
+		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;
+		}
+		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;
@@ -464,7 +474,6 @@ static void convert_to_utf8(char *line, char *charset)
 	*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++;