From 4e7e1184d5b8b1d067134e7c7459f1c610ac55e6 Mon Sep 17 00:00:00 2001
From: Galin Simeonov <gts@volconst.com>
Date: Sat, 25 Sep 2021 11:09:51 +0300
Subject: basic git-log functionality

---
 volgit.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

(limited to 'volgit.c')

diff --git a/volgit.c b/volgit.c
index f279e55..27b96fb 100644
--- a/volgit.c
+++ b/volgit.c
@@ -1,11 +1,51 @@
 #include <stdio.h>
 #include <git2.h>
 
+int print_diff_line(const git_diff_delta *delta,const git_diff_hunk *hunk,const git_diff_line *line,void *payload)
+{
+	size_t i;
+	for(i=0;i<line->content_len;++i)
+		printf("%c",line->content[i]);
+	printf("\n"); 
+	return 0;
+}
+
+void print_diff(git_tree *parent_tree,git_tree *current_tree,git_repository *repo)
+{
+	git_diff *diff_from_parent;
+	size_t number_of_deltas=0;
+	size_t i;
+
+	git_diff_tree_to_tree(&diff_from_parent,repo,current_tree,parent_tree,NULL);
+
+	git_diff_print(diff_from_parent,GIT_DIFF_FORMAT_PATCH,print_diff_line,NULL);
+
+	if(diff_from_parent)
+		git_diff_free(diff_from_parent);
+}
+void print_headers_and_commit_message(git_commit *current_commit,git_oid *current)
+{
+	const git_signature *who_commited;
+	printf("COMMIT: %s\n",git_oid_tostr_s(current));
+
+	who_commited=git_commit_committer(current_commit);
+
+	printf("AUTHOR: %s <%s>\n",who_commited->name,who_commited->email);
+
+	printf("DATE: %s\n",ctime(&who_commited->when.time));
+
+
+	printf("\t%s\n",git_commit_message(current_commit));
+}
 void print_commits(const git_reference *branch, git_repository *repo)
 {
 	const git_oid *id;
 	git_revwalk *walker;
 	git_oid current;
+	git_commit *current_commit;
+	git_time_t time_of_commit;
+	git_tree *parent_tree=NULL;
+	git_tree *current_tree;
 
 	git_revwalk_new(&walker,repo);
 	id=git_reference_target(branch);
@@ -13,7 +53,18 @@ void print_commits(const git_reference *branch, git_repository *repo)
 	
 	while(!git_revwalk_next(&current,walker))
 	{
-		printf("%s\n",git_oid_tostr_s(&current));
+		git_commit_lookup(&current_commit,repo,&current);
+		git_commit_tree(&current_tree,current_commit);
+		if(parent_tree!=NULL)
+		{
+			print_diff(current_tree,parent_tree,repo);
+			git_tree_free(parent_tree);
+		}
+		
+		print_headers_and_commit_message(current_commit,&current);
+
+		parent_tree=current_tree;
+		git_commit_free(current_commit);
 	}
 
 
-- 
cgit v1.2.3