stealed some code and put it into 'git' files

include/git.h

@@ -1,6 +1,8 @@
 #ifndef WHY2_GIT_H
 #define WHY2_GIT_H
 
+#include <git2.h>
 
+int cloneRepository(git_repository *repo, int argc, char **argv); // CLONES GIT REPOSITORY
 
 #endif

src/lib/git.c

@@ -0,0 +1,145 @@
+/*
+
+    NOTE: This is (almost) completely copied from: https://github.com/libgit2/libgit2/blob/main/examples/clone.c
+
+    I HAVE NO IDEA HOW THIS SHIT WORKS!!!
+
+*/
+
+#include <why2/git.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef PRIuZ
+#if defined(_MSC_VER) || defined(__MINGW32__)
+#	define PRIuZ "Iu"
+#else
+#	define PRIuZ "zu"
+#endif
+#endif
+
+extern int cred_acquire_cb
+(
+    git_credential **out,
+	const char *url,
+	const char *username_from_url,
+	unsigned int allowed_types,
+	void *payload
+);
+
+typedef struct progress_data
+{
+	git_indexer_progress fetch_progress;
+	size_t completed_steps;
+	size_t total_steps;
+	const char *path;
+} progress_data;
+
+static void print_progress(const progress_data *pd)
+{
+	int network_percent = pd -> fetch_progress.total_objects > 0 ?
+		(100*pd->fetch_progress.received_objects) / pd->fetch_progress.total_objects :
+		0;
+	int index_percent = pd -> fetch_progress.total_objects > 0 ?
+		(100*pd->fetch_progress.indexed_objects) / pd->fetch_progress.total_objects :
+		0;
+
+	int checkout_percent = pd -> total_steps > 0
+		? (int)((100 * pd->completed_steps) / pd->total_steps)
+		: 0;
+
+	size_t kbytes = pd->fetch_progress.received_bytes / 1024;
+
+	if (pd->fetch_progress.total_objects && pd -> fetch_progress.received_objects == pd->fetch_progress.total_objects)
+    {
+		printf
+        (
+            "Resolving deltas %u/%u\r",
+		    pd->fetch_progress.indexed_deltas,
+		    pd->fetch_progress.total_deltas
+        );
+	}
+    else
+    {
+		printf
+        (
+            "net %3d%% (%4" PRIuZ " kb, %5u/%5u)  /  idx %3d%% (%5u/%5u)  /  chk %3d%% (%4" PRIuZ "/%4" PRIuZ")%s\n",
+		    network_percent, kbytes,
+		    pd->fetch_progress.received_objects, pd->fetch_progress.total_objects,
+		    index_percent, pd->fetch_progress.indexed_objects, pd->fetch_progress.total_objects,
+		    checkout_percent,
+		    pd->completed_steps, pd->total_steps,
+		    pd->path
+        );
+	}
+}
+
+static int sideband_progress(const char *str, int len, void *payload)
+{
+	(void) payload;
+
+	printf("remote: %.*s", len, str);
+	fflush(stdout);
+	return 0;
+}
+
+static int fetch_progress(const git_indexer_progress *stats, void *payload)
+{
+	progress_data *pd = (progress_data*)payload;
+	pd->fetch_progress = *stats;
+	print_progress(pd);
+	return 0;
+}
+
+static void checkout_progress(const char *path, size_t cur, size_t tot, void *payload)
+{
+    progress_data *pd = (progress_data*)payload;
+	pd->completed_steps = cur;
+	pd->total_steps = tot;
+	pd->path = path;
+	print_progress(pd);
+}
+
+
+int cloneRepository(git_repository *repo, int argc, char **argv)
+{
+	progress_data pd = {{0}};
+	git_repository *cloned_repo = NULL;
+	git_clone_options clone_opts = GIT_CLONE_OPTIONS_INIT;
+	git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
+	const char *url = argv[1];
+	const char *path = argv[2];
+	int error;
+
+	(void) repo;
+
+	if (argc < 3)
+    {
+		printf ("USAGE: %s <url> <path>\n", argv[0]);
+		return -1;
+	}
+
+	checkout_opts.checkout_strategy = GIT_CHECKOUT_SAFE;
+	checkout_opts.progress_cb = checkout_progress;
+	checkout_opts.progress_payload = &pd;
+	clone_opts.checkout_opts = checkout_opts;
+	clone_opts.fetch_opts.callbacks.sideband_progress = sideband_progress;
+	clone_opts.fetch_opts.callbacks.transfer_progress = &fetch_progress;
+	clone_opts.fetch_opts.callbacks.credentials = cred_acquire_cb;
+	clone_opts.fetch_opts.callbacks.payload = &pd;
+
+	error = git_clone(&cloned_repo, url, path, &clone_opts);
+
+	printf("\n");
+
+	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);
+	}
+	else if (cloned_repo) git_repository_free(cloned_repo);
+
+	return error;
+}