examples: additions and fixes

add example for git commit
fix example for git add
add example for git push

Author: petersalomonsen

examples/add.c

@@ -48,9 +48,11 @@ int lg2_add(git_repository *repo, int argc, char **argv)
 	git_index_matched_path_cb matched_cb = NULL;
 	git_index *index;
 	git_strarray array = {0};
-	struct index_options options;
+	struct index_options options = {0};
 	struct args_info args = ARGS_INFO_INIT;
 
+	options.mode = INDEX_ADD;
+
 	/* Parse the options & arguments. */
 	parse_opts(NULL, &options, &args);
 	strarray_from_args(&array, &args);

examples/commit.c

@@ -0,0 +1,84 @@
+/*
+ * libgit2 "commit" example - shows how to create a git commit
+ *
+ * Written by the libgit2 contributors
+ *
+ * To the extent possible under law, the author(s) have dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide. This software is distributed without any warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication along
+ * with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#include "common.h"
+
+/**
+ * This example demonstrates the libgit2 commit APIs to roughly
+ * simulate `git commit` with the commit message argument.
+ *
+ * This does not have:
+ *
+ * - Robust error handling
+ * - Most of the `git commit` options
+ *
+ * This does have:
+ *
+ * - Example of performing a git commit with a comment
+ * 
+ */
+int lg2_commit(git_repository *repo, int argc, char **argv)
+{
+	const char *opt = argv[1];
+	const char *comment = argv[2];
+	int error;
+
+	git_oid commit_oid,tree_oid;
+	git_tree *tree;
+	git_index *index;	
+	git_object *parent = NULL;
+	git_reference *ref = NULL;
+	git_signature *signature;	
+
+	/* Validate args */
+	if (argc < 3 || strcmp(opt, "-m") != 0) {
+		printf ("USAGE: %s -m <comment>\n", argv[0]);
+		return -1;
+	}
+
+	error = git_revparse_ext(&parent, &ref, repo, "HEAD");
+	if (error == GIT_ENOTFOUND) {
+		printf("HEAD not found. Creating first commit\n");
+		error = 0;
+	} else if (error != 0) {
+		const git_error *err = git_error_last();
+		if (err) printf("ERROR %d: %s\n", err->klass, err->message);
+		else printf("ERROR %d: no detailed info\n", error);
+	}
+
+	check_lg2(git_repository_index(&index, repo), "Could not open repository index", NULL);
+	check_lg2(git_index_write_tree(&tree_oid, index), "Could not write tree", NULL);;
+	check_lg2(git_index_write(index), "Could not write index", NULL);;
+
+	check_lg2(git_tree_lookup(&tree, repo, &tree_oid), "Error looking up tree", NULL);
+	
+	check_lg2(git_signature_default(&signature, repo), "Error creating signature", NULL);
+	
+	check_lg2(git_commit_create_v(
+		&commit_oid,
+		repo,
+		"HEAD",
+		signature,
+		signature,
+		NULL,
+		comment,
+		tree,
+		parent ? 1 : 0, parent), "Error creating commit", NULL);
+
+	git_index_free(index);
+	git_signature_free(signature);
+	git_tree_free(tree);	
+
+	return error;
+}

examples/common.h

@@ -59,6 +59,7 @@ extern int lg2_blame(git_repository *repo, int argc, char **argv);
 extern int lg2_cat_file(git_repository *repo, int argc, char **argv);
 extern int lg2_checkout(git_repository *repo, int argc, char **argv);
 extern int lg2_clone(git_repository *repo, int argc, char **argv);
+extern int lg2_commit(git_repository *repo, int argc, char **argv);
 extern int lg2_config(git_repository *repo, int argc, char **argv);
 extern int lg2_describe(git_repository *repo, int argc, char **argv);
 extern int lg2_diff(git_repository *repo, int argc, char **argv);
@@ -71,6 +72,7 @@ extern int lg2_log(git_repository *repo, int argc, char **argv);
 extern int lg2_ls_files(git_repository *repo, int argc, char **argv);
 extern int lg2_ls_remote(git_repository *repo, int argc, char **argv);
 extern int lg2_merge(git_repository *repo, int argc, char **argv);
+extern int lg2_push(git_repository *repo, int argc, char **argv);
 extern int lg2_remote(git_repository *repo, int argc, char **argv);
 extern int lg2_rev_list(git_repository *repo, int argc, char **argv);
 extern int lg2_rev_parse(git_repository *repo, int argc, char **argv);

examples/lg2.c

@@ -15,6 +15,7 @@ struct {
 	{ "cat-file",     lg2_cat_file,     1 },
 	{ "checkout",     lg2_checkout,     1 },
 	{ "clone",        lg2_clone,        0 },
+	{ "commit",       lg2_commit,       1 },
 	{ "config",       lg2_config,       1 },
 	{ "describe",     lg2_describe,     1 },
 	{ "diff",         lg2_diff,         1 },
@@ -27,6 +28,7 @@ struct {
 	{ "ls-files",     lg2_ls_files,     1 },
 	{ "ls-remote",    lg2_ls_remote,    1 },
 	{ "merge",        lg2_merge,        1 },
+	{ "push",         lg2_push,        1  },
 	{ "remote",       lg2_remote,       1 },
 	{ "rev-list",     lg2_rev_list,     1 },
 	{ "rev-parse",    lg2_rev_parse,    1 },

examples/push.c

@@ -0,0 +1,56 @@
+/*
+ * libgit2 "push" example - shows how to push to remote
+ *
+ * Written by the libgit2 contributors
+ *
+ * To the extent possible under law, the author(s) have dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide. This software is distributed without any warranty.
+ *
+ * You should have received a copy of the CC0 Public Domain Dedication along
+ * with this software. If not, see
+ * <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#include "common.h"
+
+/**
+ * This example demonstrates the libgit2 push API to roughly
+ * simulate `git push`.
+ *
+ * This does not have:
+ *
+ * - Robust error handling
+ * - Any of the `git push` options
+ *
+ * This does have:
+ *
+ * - Example of push to origin/master
+ * 
+ */
+
+/** Entry point for this command */
+int lg2_push(git_repository *repo, int argc, char **argv) {
+	git_push_options options;
+	git_remote* remote = NULL;
+	char *refspec = "refs/heads/master";
+	const git_strarray refspecs = {
+		&refspec,
+		1
+	};
+
+    /* Validate args */
+	if (argc > 1) {
+		printf ("USAGE: %s\n\nsorry, no arguments supported yet\n", argv[0]);
+		return -1;
+	}
+
+	check_lg2(git_remote_lookup(&remote, repo, "origin" ), "Unable to lookup remote", NULL);
+	
+	check_lg2(git_push_options_init(&options, GIT_PUSH_OPTIONS_VERSION ), "Error initializing push", NULL);
+
+	check_lg2(git_remote_push(remote, &refspecs, &options), "Error pushing", NULL);
+
+	printf("pushed\n");
+	return 0;
+}