[PATCH 4/8] svn-fe: add usage and unpositional arguments versions

[Dmitry Ivankov <divanorama@gmail.com>]

There will be more command line options for svn-fe so support
unpositional version for flexibility. Also clarify the meaning
of url parameter.

$ svn-fe --git-svn-id-url=url
does the same thing as
$ svn-fe url
i.e., url is used to generate git-svn-id: lines, if url is set.

Signed-off-by: Dmitry Ivankov <divanorama@gmail.com>
---
 contrib/svn-fe/Makefile   |    2 +-
 contrib/svn-fe/svn-fe.c   |   30 +++++++++++++++++++++++++++---
 contrib/svn-fe/svn-fe.txt |   17 +++++++++++++----
 3 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/contrib/svn-fe/Makefile b/contrib/svn-fe/Makefile
index bf1625c..3e18395 100644
--- a/contrib/svn-fe/Makefile
+++ b/contrib/svn-fe/Makefile
@@ -41,7 +41,7 @@ svn-fe$X: svn-fe.o $(VCSSVN_LIB) $(GIT_LIB)
 		$(ALL_LDFLAGS) $(LIBS)
 
 svn-fe.o: svn-fe.c ../../vcs-svn/svndump.h
-	$(QUIET_CC)$(CC) -I../../vcs-svn -o $*.o -c $(ALL_CFLAGS) $<
+	$(QUIET_CC)$(CC) -I../../vcs-svn -I../.. -o $*.o -c $(ALL_CFLAGS) $<
 
 svn-fe.html: svn-fe.txt
 	$(QUIET_SUBDIR0)../../Documentation $(QUIET_SUBDIR1) \
diff --git a/contrib/svn-fe/svn-fe.c b/contrib/svn-fe/svn-fe.c
index 11d7128..033dd5b 100644
--- a/contrib/svn-fe/svn-fe.c
+++ b/contrib/svn-fe/svn-fe.c
@@ -3,12 +3,36 @@
  * You may freely use, modify, distribute, and relicense it.
  */
 
-#include <stdlib.h>
+#include "git-compat-util.h"
+#include "parse-options.h"
 #include "svndump.h"
 
-int main(int argc, char **argv)
+static const char * const svn_fe_usage[] = {
+	"svn-fe [options] [git-svn-id-url] < dump | fast-import-backend",
+	NULL
+};
+
+static const char *url;
+
+static struct option svn_fe_options[] = {
+	OPT_STRING(0, "git-svn-id-url", &url, "url",
+		"append git-svn metadata line to commit messages"),
+	OPT_END()
+};
+
+int main(int argc, const char **argv)
 {
-	if (svndump_init(NULL, (argc > 1) ? argv[1] : NULL))
+	argc = parse_options(argc, argv, NULL, svn_fe_options,
+						svn_fe_usage, 0);
+	if (argc == 1) {
+		if (url)
+			usage_msg_opt("git-svn-id-url is set twice: as a "
+					"--parameter and as a [parameter]",
+					svn_fe_usage, svn_fe_options);
+		url = argv[0];
+	} else if (argc)
+		usage_with_options(svn_fe_usage, svn_fe_options);
+	if (svndump_init(NULL, url))
 		return 1;
 	svndump_read();
 	svndump_deinit();
diff --git a/contrib/svn-fe/svn-fe.txt b/contrib/svn-fe/svn-fe.txt
index 2dd27ce..8c6d347 100644
--- a/contrib/svn-fe/svn-fe.txt
+++ b/contrib/svn-fe/svn-fe.txt
@@ -10,7 +10,7 @@ SYNOPSIS
 [verse]
 mkfifo backchannel &&
 svnadmin dump --deltas REPO |
-	svn-fe [url] 3<backchannel |
+	svn-fe [options] [git-svn-id-url] 3<backchannel |
 	git fast-import --cat-blob-fd=3 3>backchannel
 
 DESCRIPTION
@@ -25,6 +25,14 @@ command.
 Note: this tool is very young.  The details of its commandline
 interface may change in backward incompatible ways.
 
+OPTIONS
+-------
+
+--git-svn-id-url=<url>::
+	Url to be used in git-svn-id: lines in git-svn
+	metadata lines format. See NOTES for more detailed
+	description.
+
 INPUT FORMAT
 ------------
 Subversion's repository dump format is documented in full in
@@ -50,9 +58,10 @@ user <user@UUID>
 as committer, where 'user' is the value of the `svn:author` property
 and 'UUID' the repository's identifier.
 
-To support incremental imports, 'svn-fe' puts a `git-svn-id` line at
-the end of each commit log message if passed an url on the command
-line.  This line has the form `git-svn-id: URL@REVNO UUID`.
+'svn-fe' can be used in preparing a repository for 'git-svn' as follows.
+If `git-svn-id-url` is specified, 'svn-fe' will put `git-svn-id` line at
+the end of each commit log message.
+This line has the form `git-svn-id: URL@REVNO UUID`.
 
 The resulting repository will generally require further processing
 to put each project in its own repository and to separate the history
-- 
1.7.3.4