From 367cb0b2358be04d18dfea963d1c42044893e3b4 Mon Sep 17 00:00:00 2001
From: Katharina Fey <kookie@spacekookie.de>
Date: Mon, 22 Jun 2020 10:17:52 +0200
Subject: git/log: adding a lot of parsing code to make libgit2 useful

---
 src/git/log.rs | 63 +++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 54 insertions(+), 9 deletions(-)

diff --git a/src/git/log.rs b/src/git/log.rs
index dab9e69..97101cf 100644
--- a/src/git/log.rs
+++ b/src/git/log.rs
@@ -15,18 +15,20 @@ use std::collections::{BTreeMap, BTreeSet};
 /// heavily parse the log.  This type here is the result of this
 /// parsing: you can ask it smart questions like "when did this file
 /// change" and it will tell you (sort of).
-#[derive(Default)]
+#[derive(Debug, Default)]
 pub(crate) struct CommitGraph {
     order: Vec<String>,
     file_refs: BTreeMap<String, BTreeSet<String>>,
     commit_refs: BTreeMap<String, CommitNode>,
 }
 
+#[derive(Debug)]
 pub(crate) struct CommitNode {
     id: String,
     author: String,
+    message: String,
     touches: BTreeSet<String>,
-    date: String,
+    time: i64,
 }
 
 fn build_diff_log(repo: &Repository, log: Vec<(String, Vec<FileNode>)>) -> Vec<CommitNode> {
@@ -37,25 +39,68 @@ fn build_diff_log(repo: &Repository, log: Vec<(String, Vec<FileNode>)>) -> Vec<C
 pub(crate) fn create_commit_log(id: String, repo: &Repository) -> CommitGraph {
     let mut walker = repo.revwalk().unwrap();
     walker.push(Oid::from_str(id.as_str()).unwrap()).unwrap();
-    let mut v = walker
+    let mut commits = walker
         .into_iter()
         .map(|oid| {
             let oid = oid.unwrap();
             repo.find_commit(oid).unwrap()
         })
         .collect::<Vec<_>>();
-    v.reverse();
+    commits.reverse();
 
-    let log: Vec<_> = v
+    let mut initial: Vec<(_, _)> = commits
         .into_iter()
         .map(|commit| {
             let id = format!("{}", commit.id());
-            let tree_u = git::repo::get_tree(&repo, id.as_str());
-            let tree = git::tree::parse_tree(tree_u, &repo);
-            (id, tree.flatten())
+            (id.clone(), git::repo::get_tree(&repo, id.as_str()))
         })
         .collect();
 
-    let diffs = build_diff_log(&repo, log);
+    // split off rest of the diffs and dissolve the len(1) vec
+    let log = initial.split_off(1);
+    let previous = initial.remove(0).1;
+
+    let mut order = vec![];
+    let (commit_refs, file_refs) = log.into_iter().fold(
+        (BTreeMap::new(), BTreeMap::new()),
+        |(mut cm, mut fm), (cid, current)| {
+            let d = repo
+                .diff_tree_to_tree(Some(&previous), Some(&current), None)
+                .unwrap();
+            let files = d.deltas().fold(BTreeSet::new(), |mut set, delta| {
+                set.insert(format!("{}", delta.new_file().id()));
+                set
+            });
+
+            order.push(cid.clone());
+            fm.insert(cid.clone(), files.clone());
+
+            let commit_u = repo
+                .find_commit(Oid::from_str(cid.as_str()).unwrap())
+                .unwrap();
+            let author_u = commit_u.author();
+            let commit = CommitNode {
+                id: cid.clone(),
+                message: commit_u.message().unwrap().to_owned(),
+                author: format!("{} {}", author_u.name().unwrap(), author_u.email().unwrap()),
+                touches: files,
+                time: author_u.when().seconds(),
+            };
+
+            cm.insert(cid.clone(), commit);
+
+            (cm, fm)
+        },
+    );
+
+    let graph = CommitGraph {
+        order,
+        file_refs,
+        commit_refs,
+    };
+
+    dbg!(graph);
+
+    // let diffs = build_diff_log(&repo, log);
     todo!()
 }
-- 
cgit v1.2.3