introduced .tar.bz2 snapshots

- reworked write_tar_gzip_archive to handle arbitrary filter as a
   write_compressed_tar_archive
 - reformatted whitespaces in the said function to adhere to common cgit
   standards
 - added wrappers around write_compressed_tar_archive for .tar.gz and .tar.bz2
 - added a hint for vim to use 8 characters shift width by default

Signed-off-by: Michael Krelin <hacker@klever.net>

ui-snapshot.c

@@ -8,7 +8,7 @@
 
 #include "cgit.h"
 
-static int write_tar_gzip_archive(struct archiver_args *args)
+static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
 {
 	int rw[2];
 	pid_t gzpid;
@@ -24,7 +24,7 @@ static int write_tar_gzip_archive(struct archiver_args *args)
 		chk_zero(close(rw[1]), "Closing write end of pipe in child");
 		chk_zero(close(STDIN_FILENO), "Closing STDIN");
 		chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
-	    execlp("gzip","gzip",NULL);
+		execlp(filter,filter,NULL);
 		_exit(-1);
 	}
 	/* parent */
@@ -44,13 +44,23 @@ static int write_tar_gzip_archive(struct archiver_args *args)
 	return rv;
 }
 
+static int write_tar_gzip_archive(struct archiver_args *args)
+{
+	return write_compressed_tar_archive(args,"gzip");
+}
+static int write_tar_bzip2_archive(struct archiver_args *args)
+{
+	return write_compressed_tar_archive(args,"bzip2");
+}
+
 static const struct snapshot_archive_t {
     	const char *suffix;
 	const char *mimetype;
 	write_archive_fn_t write_func;
 }	snapshot_archives[] = {
 	{ ".zip", "application/x-zip", write_zip_archive },
-	{ ".tar.gz", "application/x-gzip", write_tar_gzip_archive }
+	{ ".tar.gz", "application/x-tar", write_tar_gzip_archive },
+	{ ".tar.bz2", "application/x-tar", write_tar_bzip2_archive }
 };
 
 void cgit_print_snapshot(struct cacheitem *item, const char *hex, 
@@ -102,3 +112,4 @@ void cgit_print_snapshot_links(const char *repo,const char *hex)
 			    fmt("id=%s&name=%s",hex,filename)), filename);
 	}
 }
+/* vim:set sw=8: */