From 2502c5d513d81fbafce63f81ea4c42ab880838fd Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Thu, 7 Jul 2022 23:41:42 +0200
Subject: Moved lg2 error handling into a try-or-die function

---
 pkgrel.c | 74 +++++++++++++++++++++-------------------------------------------
 1 file changed, 24 insertions(+), 50 deletions(-)

diff --git a/pkgrel.c b/pkgrel.c
index 5c1d348..d3b2749 100644
--- a/pkgrel.c
+++ b/pkgrel.c
@@ -62,11 +62,17 @@ relative_path_in_current_dir(git_repository* repo, const char* filename)
 }
 
 
-void
-gerror(void)
+int
+try_git(const int err, const char* optional_prefix)
 {
-	const git_error* err = git_error_last();
-	dprintf(2, "%s\n", err->message);
+	if (0 > err) {
+		const git_error* e = git_error_last();
+		if (NULL != optional_prefix)
+			dprintf(2, "%s: ", optional_prefix);
+		dprintf(2, "%s\n", e->message);
+		exit(1);
+	}
+	return err;
 }
 
 
@@ -96,61 +102,37 @@ main(int argc, char* argv[])
 {
 	git_libgit2_init();
 	git_repository* repo = NULL;
-	int err = git_repository_open_ext(&repo, NULL, GIT_REPOSITORY_OPEN_FROM_ENV, NULL);
-	if (0 > err) {
-		gerror();
-		return 1;
-	}
+	try_git(git_repository_open_ext(&repo, NULL, GIT_REPOSITORY_OPEN_FROM_ENV, NULL), "opening repo");
 	git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
-	diffopts.pathspec.strings = (char*[]){relative_path_in_current_dir(repo, "PKGBUILD")};
+	diffopts.pathspec.strings = (char*[1]){relative_path_in_current_dir(repo, "PKGBUILD")};
 	diffopts.pathspec.count = 1;
-	git_pathspec* pathspec = NULL;
-	err = git_pathspec_new(&pathspec, &diffopts.pathspec);
-	if (0 > err) {
-		gerror();
-		return 1;
+	if (NULL == diffopts.pathspec.strings[0]) {
+		dprintf(2, "finding PKGBUILD in repo\n");
+		exit(1);
 	}
+	git_pathspec* pathspec = NULL;
+	try_git(git_pathspec_new(&pathspec, &diffopts.pathspec), "creating pathspec");
 	git_revwalk* walker = NULL;
-	err = git_revwalk_new(&walker, repo);
-	if (0 > err) {
-		gerror();
-		return 1;
-	}
-	err = git_revwalk_push_head(walker);
-	if (0 > err) {
-		gerror();
-		return 1;
-	}
+	try_git(git_revwalk_new(&walker, repo), "creating revwalker");
+	try_git(git_revwalk_push_head(walker), "finding head");
 	git_oid oid;
 	git_tree* earlier = NULL;
 	git_tree* later = NULL;
 	int rel = 1;
 	while (0 == git_revwalk_next(&oid, walker)) {
 		git_commit* commit;
-		err = git_commit_lookup(&commit, repo, &oid);
-		if (0 > err) {
-			gerror();
-			return 1;
-		}
+		try_git(git_commit_lookup(&commit, repo, &oid), "finding commit");
 		if (NULL != earlier)
 			git_tree_free(earlier);
 		earlier = later;
-		err = git_commit_tree(&later, commit);
-		if (0 > err) {
-			gerror();
-			return 1;
-		}
+		try_git(git_commit_tree(&later, commit), "finding tree");
 		git_diff* diff;
 		if (NULL == earlier)
-			err = git_diff_tree_to_workdir_with_index(&diff, repo, later, &diffopts);
+			try_git(git_diff_tree_to_workdir_with_index(&diff, repo, later, &diffopts), "diff");
 		else
-			err = git_diff_tree_to_tree(&diff, repo, later, earlier, &diffopts);
-		if (0 > err) {
-			gerror();
-			return 1;
-		}
+			try_git(git_diff_tree_to_tree(&diff, repo, later, earlier, &diffopts), "diff");
 		enum match_result matched = MATCH_RESULT_INITIAL;
-		git_diff_foreach(diff, NULL, NULL, NULL, &line_line, &matched);
+		try_git(git_diff_foreach(diff, NULL, NULL, NULL, &line_line, &matched), "searching lines");
 		git_diff_free(diff);
 		git_commit_free(commit);
 		if (MATCH_RESULT_FOUND == matched)
@@ -158,13 +140,5 @@ main(int argc, char* argv[])
 		if (MATCH_RESULT_INITIAL != matched)
 			rel++;
 	}
-	if (NULL != earlier)
-		git_tree_free(earlier);
-	if (NULL != later)
-		git_tree_free(later);
-	git_revwalk_free(walker);
-	git_pathspec_free(pathspec);
-	free(diffopts.pathspec.strings[0]);
-	git_repository_free(repo);
 	printf("%d\n", rel);
 }
-- 
cgit v1.1