Split out mailmap handling out of shortlog

This splits out a few functions to deal with mailmap from
shortlog and makes it a bit more usable from other programs.
Most notably, it does not clobber input e-mail address anymore.

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

1 files changed, 88 insertions, 0 deletions

diff --git a/mailmap.c b/mailmap.c
new file mode 100644
index 0000000000..af187a3826
--- /dev/null
+++ b/mailmap.c
@@ -0,0 +1,88 @@
+#include "cache.h"
+#include "path-list.h"
+
+int read_mailmap(struct path_list *map, const char *filename, char **repo_abbrev)
+{
+	char buffer[1024];
+	FILE *f = fopen(filename, "r");
+
+	if (f == NULL)
+		return 1;
+	while (fgets(buffer, sizeof(buffer), f) != NULL) {
+		char *end_of_name, *left_bracket, *right_bracket;
+		char *name, *email;
+		int i;
+		if (buffer[0] == '#') {
+			static const char abbrev[] = "# repo-abbrev:";
+			int abblen = sizeof(abbrev) - 1;
+			int len = strlen(buffer);
+
+			if (len && buffer[len - 1] == '\n')
+				buffer[--len] = 0;
+			if (!strncmp(buffer, abbrev, abblen)) {
+				char *cp;
+
+				if (repo_abbrev)
+					free(*repo_abbrev);
+				*repo_abbrev = xmalloc(len);
+
+				for (cp = buffer + abblen; isspace(*cp); cp++)
+					; /* nothing */
+				strcpy(*repo_abbrev, cp);
+			}
+			continue;
+		}
+		if ((left_bracket = strchr(buffer, '<')) == NULL)
+			continue;
+		if ((right_bracket = strchr(left_bracket + 1, '>')) == NULL)
+			continue;
+		if (right_bracket == left_bracket + 1)
+			continue;
+		for (end_of_name = left_bracket; end_of_name != buffer
+				&& isspace(end_of_name[-1]); end_of_name--)
+			/* keep on looking */
+		if (end_of_name == buffer)
+			continue;
+		name = xmalloc(end_of_name - buffer + 1);
+		strlcpy(name, buffer, end_of_name - buffer + 1);
+		email = xmalloc(right_bracket - left_bracket);
+		for (i = 0; i < right_bracket - left_bracket - 1; i++)
+			email[i] = tolower(left_bracket[i + 1]);
+		email[right_bracket - left_bracket - 1] = '\0';
+		path_list_insert(email, map)->util = name;
+	}
+	fclose(f);
+	return 0;
+}
+
+int map_email(struct path_list *map, const char *email, char *name, int maxlen)
+{
+	char *p;
+	struct path_list_item *item;
+	char buf[1024], *mailbuf;
+	int i;
+
+	/* autocomplete common developers */
+	p = strchr(email, '>');
+	if (!p)
+		return 0;
+	if (p - email + 1 < sizeof(buf))
+		mailbuf = buf;
+	else
+		mailbuf = xmalloc(p - email + 1);
+
+	/* downcase the email address */
+	for (i = 0; i < p - email; i++)
+		mailbuf[i] = tolower(email[i]);
+	mailbuf[i] = 0;
+	item = path_list_lookup(mailbuf, map);
+	if (mailbuf != buf)
+		free(mailbuf);
+	if (item != NULL) {
+		const char *realname = (const char *)item->util;
+		strncpy(name, realname, maxlen);
+		return 1;
+	}
+	return 0;
+}
+