[PATCH 2/5] add the ability to select more email header fields to output

[Don Zickus <dzickus@redhat.com>]

This is useful when scripts need more than just the basic email headers to
parse.  By specifying the "-x=" option, one can search and output any header
field they want.

Signed-off-by: Don Zickus <dzickus@redhat.com>
---
 builtin-mailinfo.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/builtin-mailinfo.c b/builtin-mailinfo.c
index dacdf77..dd0f563 100644
--- a/builtin-mailinfo.c
+++ b/builtin-mailinfo.c
@@ -856,11 +856,12 @@ int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
 }
 
 static const char mailinfo_usage[] =
-	"git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
+	"git-mailinfo [-k] [-u | --encoding=<encoding>] [-x=<field>] msg patch <mail >info";
 
 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 {
 	const char *def_charset;
+	int top;
 
 	/* NEEDSWORK: might want to do the optional .git/ directory
 	 * discovery
@@ -870,6 +871,8 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 	def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
 	metainfo_charset = def_charset;
 
+	for (top=0; header[top]; top++){ ; }
+
 	while (1 < argc && argv[1][0] == '-') {
 		if (!strcmp(argv[1], "-k"))
 			keep_subject = 1;
@@ -879,7 +882,10 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 			metainfo_charset = NULL;
 		else if (!prefixcmp(argv[1], "--encoding="))
 			metainfo_charset = argv[1] + 11;
-		else
+		else if (!prefixcmp(argv[1], "-x=")) {
+			header[top] = xmalloc(256*sizeof(char));
+			strncpy(header[top++], argv[1]+3, 256);
+		} else
 			usage(mailinfo_usage);
 		argc--; argv++;
 	}
-- 
1.5.0.2.211.g2ca9-dirty