examples: create common lg2 executable

Inside of our networking example code, we have a git2 executable
that acts as an entry point to all the different network
examples. As such, it is kind of the same like the normal git(1)
executable in that it simply arbitrates to the respective
subcommands.

Let's extend this approach and merge all examples into a single
standalone lg2 executable. Instead of building an executable
for all the existing examples we have, we now bundle them all
inside of the lg2 one and let them be callable via subcommands.

In the process, we can get rid of duplicated library
initialization, deinitialization and repository discovery code.
Instead of having each subcommand handle these on its own, we
simply do it inside of the single main function now.

1 files changed, 1 insertions, 11 deletions

diff --git a/examples/diff.c b/examples/diff.c
index 1de0483a3..e8ba918f6 100644
--- a/examples/diff.c
+++ b/examples/diff.c
@@ -67,9 +67,8 @@ static int color_printer(
 	const git_diff_delta*, const git_diff_hunk*, const git_diff_line*, void*);
 static void diff_print_stats(git_diff *diff, struct opts *o);
 
-int main(int argc, char *argv[])
+int lg2_diff(git_repository *repo, int argc, char *argv[])
 {
-	git_repository *repo = NULL;
 	git_tree *t1 = NULL, *t2 = NULL;
 	git_diff *diff;
 	struct opts o = {
@@ -77,13 +76,8 @@ int main(int argc, char *argv[])
 		-1, 0, 0, GIT_DIFF_FORMAT_PATCH, NULL, NULL, "."
 	};
 
-	git_libgit2_init();
-
 	parse_opts(&o, argc, argv);
 
-	check_lg2(git_repository_open_ext(&repo, o.dir, 0, NULL),
-		"Could not open repository", o.dir);
-
 	/**
 	 * Possible argument patterns:
 	 *
@@ -157,13 +151,9 @@ int main(int argc, char *argv[])
 	}
 
 	/** Cleanup before exiting. */
-
 	git_diff_free(diff);
 	git_tree_free(t1);
 	git_tree_free(t2);
-	git_repository_free(repo);
-
-	git_libgit2_shutdown();
 
 	return 0;
 }