Implement commit view

7 files changed, 284 insertions, 76 deletions

diff --git a/gitsrht/blueprints/repo.py b/gitsrht/blueprints/repo.py
index 0ae2185..511272d 100644
--- a/gitsrht/blueprints/repo.py
+++ b/gitsrht/blueprints/repo.py
@@ -9,7 +9,7 @@ from flask_login import current_user
 from gitsrht.access import get_repo, has_access, UserAccess
 from gitsrht.editorconfig import EditorConfig
 from gitsrht.redis import redis
-from gitsrht.git import CachedRepository, commit_time, annotate_tree
+from gitsrht.git import CachedRepository, commit_time, annotate_tree, diffstat
 from gitsrht.types import User, Repository
 from io import BytesIO
 from pygments import highlight
@@ -89,29 +89,6 @@ def summary(owner, repo):
             clone_urls=clone_urls, latest_tag=latest_tag,
             default_branch=default_branch)
 
-def resolve_ref(git_repo, ref):
-    commit = None
-    if ref is None:
-        branch = git_repo.default_branch()
-        ref = branch.name[len("refs/heads/"):]
-        commit = git_repo.get(branch.target)
-    else:
-        if f"refs/heads/{ref}" in git_repo.references:
-            branch = git_repo.references[f"refs/heads/{ref}"]
-            commit = git_repo.get(branch.target)
-        elif f"refs/tags/{ref}" in git_repo.references:
-            _ref = git_repo.references[f"refs/tags/{ref}"]
-            tag = git_repo.get(_ref.target)
-            commit = git_repo.get(tag.target)
-        else:
-            try:
-                ref = git_repo.get(ref)
-            except:
-                abort(404)
-    if not commit:
-        abort(404)
-    return ref, commit
-
 @repo.route("/<owner>/<repo>/tree", defaults={"ref": None, "path": ""})
 @repo.route("/<owner>/<repo>/tree/<ref>", defaults={"path": ""})
 @repo.route("/<owner>/<repo>/tree/<ref>/<path:path>")
@@ -122,7 +99,10 @@ def tree(owner, repo, ref, path):
     if not has_access(repo, UserAccess.read):
         abort(401)
     git_repo = CachedRepository(repo.path)
-    ref, commit = resolve_ref(git_repo, ref)
+    ref = ref or git_repo.default_branch().name[len("refs/heads/"):]
+    commit = git_repo.revparse_single(ref)
+    if commit is pygit2.Tag:
+        commit = git_repo.get(commit.target)
 
     tree = commit.tree
     editorconfig = EditorConfig(git_repo, tree, path)
@@ -165,7 +145,10 @@ def raw_blob(owner, repo, ref, path):
     if not has_access(repo, UserAccess.read):
         abort(401)
     git_repo = CachedRepository(repo.path)
-    ref, commit = resolve_ref(git_repo, ref)
+    ref = ref or git_repo.default_branch().name[len("refs/heads/"):]
+    commit = git_repo.revparse_single(ref)
+    if commit is pygit2.Tag:
+        commit = git_repo.get(commit.target)
 
     blob = None
     entry = None
@@ -198,7 +181,10 @@ def archive(owner, repo, ref):
     if not has_access(repo, UserAccess.read):
         abort(401)
     git_repo = CachedRepository(repo.path)
-    ref, commit = resolve_ref(git_repo, ref)
+    ref = ref or git_repo.default_branch().name[len("refs/heads/"):]
+    commit = git_repo.revparse_single(ref)
+    if commit is pygit2.Tag:
+        commit = git_repo.get(commit.target)
 
     path = f"/tmp/{commit.id.hex}.tar.gz"
     try:
@@ -253,6 +239,17 @@ class _AnnotatedRef:
         else:
             self.type = None
 
+def collect_refs(git_repo):
+    refs = {}
+    for _ref in git_repo.references:
+        _ref = _AnnotatedRef(git_repo, git_repo.references[_ref])
+        if not _ref.type:
+            continue
+        if _ref.commit.id.hex not in refs:
+            refs[_ref.commit.id.hex] = []
+        refs[_ref.commit.id.hex].append(_ref)
+    return refs
+
 @repo.route("/<owner>/<repo>/log", defaults={"ref": None, "path": ""})
 @repo.route("/<owner>/<repo>/log/<ref>", defaults={"path": ""})
 @repo.route("/<owner>/<repo>/log/<ref>/<path:path>")
@@ -263,17 +260,11 @@ def log(owner, repo, ref, path):
     if not has_access(repo, UserAccess.read):
         abort(401)
     git_repo = CachedRepository(repo.path)
-    ref, commit = resolve_ref(git_repo, ref)
-
-    refs = {}
-    for _ref in git_repo.references:
-        _ref = _AnnotatedRef(git_repo, git_repo.references[_ref])
-        if not _ref.type:
-            continue
-        print(_ref.commit.id.hex, _ref.name)
-        if _ref.commit.id.hex not in refs:
-            refs[_ref.commit.id.hex] = []
-        refs[_ref.commit.id.hex].append(_ref)
+    ref = ref or git_repo.default_branch().name[len("refs/heads/"):]
+    commit = git_repo.revparse_single(ref)
+    if commit is pygit2.Tag:
+        commit = git_repo.get(commit.target)
+    refs = collect_refs(git_repo)
 
     from_id = request.args.get("from")
     if from_id:
@@ -289,3 +280,26 @@ def log(owner, repo, ref, path):
     return render_template("log.html", view="log",
             owner=owner, repo=repo, ref=ref, path=path,
             commits=commits, refs=refs)
+
+@repo.route("/<owner>/<repo>/commit/<ref>")
+def commit(owner, repo, ref):
+    owner, repo = get_repo(owner, repo)
+    if not repo:
+        abort(404)
+    if not has_access(repo, UserAccess.read):
+        abort(401)
+    git_repo = CachedRepository(repo.path)
+    commit = git_repo.revparse_single(ref)
+    if commit is pygit2.Tag:
+        ref = git_repo.get(commit.target)
+    try:
+        parent = git_repo.revparse_single(ref + "^")
+        diff = git_repo.diff(parent, ref)
+    except KeyError:
+        diff = ref.tree.diff_to_tree()
+    diff.find_similar(pygit2.GIT_DIFF_FIND_RENAMES)
+    refs = collect_refs(git_repo)
+    return render_template("commit.html", view="log",
+        owner=owner, repo=repo, ref=ref, refs=refs,
+        commit=commit, parent=parent,
+        diff=diff, diffstat=diffstat, pygit2=pygit2)
diff --git a/gitsrht/git.py b/gitsrht/git.py
index ac00fef..257e954 100644
--- a/gitsrht/git.py
+++ b/gitsrht/git.py
@@ -3,6 +3,8 @@ from datetime import datetime, timedelta, timezone
 from functools import lru_cache
 from gitsrht.redis import redis
 from pygit2 import Repository, Tag
+from jinja2 import Markup, escape
+from stat import filemode
 import pygit2
 import json
 
@@ -131,3 +133,52 @@ def annotate_tree(repo, tree, commit):
     redis.setex(key, cache, timedelta(days=30))
 
     return [entry.fetch_blob() for entry in tree.values()]
+
+def _diffstat_name(delta):
+    if delta.status == pygit2.GIT_DELTA_DELETED:
+        return Markup(escape(delta.old_file.path))
+    if delta.old_file.path == delta.new_file.path:
+        return Markup(
+                f"<a href='#{escape(delta.old_file.path)}'>" +
+                f"{escape(delta.old_file.path)}" +
+                f"</a>")
+    # Based on git/diff.c
+    pfx_length = 0
+    old_path = delta.old_file.path
+    new_path = delta.new_file.path
+    for i in range(max(len(old_path), len(new_path))):
+        if i >= len(old_path) or i >= len(new_path):
+            break
+        if old_path[i] == '/':
+            pfx_length = i + 1
+    # TODO: detect common suffix
+    if pfx_length != 0:
+        return (f"{delta.old_file.path[:pfx_length]}{{" +
+            f"{delta.old_file.path[pfx_length:]} =&gt; {delta.new_file.path[pfx_length:]}" +
+            f"}}")
+    return f"{delta.old_file.path} => {delta.new_file.path}"
+
+def _diffstat_line(delta, patch):
+    name = _diffstat_name(delta)
+    change = ""
+    if delta.status not in [
+                pygit2.GIT_DELTA_ADDED,
+                pygit2.GIT_DELTA_DELETED,
+            ]:
+        if delta.old_file.mode != delta.new_file.mode:
+            change = Markup(
+                f" <span title='{delta.old_file.mode}'>" +
+                f"{filemode(delta.old_file.mode)}</span> => " +
+                f"<span title='{delta.new_file.mode}'>" +
+                f"{filemode(delta.new_file.mode)}</span>")
+    return Markup(f"{delta.status_char()} {name}{change}\n")
+
+def diffstat(diff):
+    stat = Markup(f"""{diff.stats.files_changed} files changed, <strong
+        class="text-success">{diff.stats.insertions
+        }</strong> insertions(+), <strong
+        class="text-danger">{diff.stats.deletions
+        }</strong> deletions(-)\n\n""")
+    for delta, patch in zip(diff.deltas, diff):
+        stat += _diffstat_line(delta, patch)
+    return stat
diff --git a/gitsrht/templates/commit.html b/gitsrht/templates/commit.html
new file mode 100644
index 0000000..88b9f37
--- /dev/null
+++ b/gitsrht/templates/commit.html
@@ -0,0 +1,100 @@
+{% extends "repo.html" %}
+{% import "utils.html" as utils %}
+{% block content %}
+<div class="container">
+  <div class="row">
+    <div class="col-md-10">
+      <div class="event-list">
+        <div class="event">
+          {{ utils.commit_event(repo, commit, commit_time, trim_commit,
+              full_body=True, full_id=True, refs=refs, parents=True,
+              any=any) }}
+        </div>
+      </div>
+    </div>
+    <div class="col-md-2">
+      <a href="#" class="btn btn-primary btn-block">
+        browse {{icon("caret-right")}}
+      </a>
+      <a href="#" class="btn btn-default btn-block">
+        patch {{icon("caret-right")}}
+      </a>
+    </div>
+  </div>
+  <div class="row">
+    <div class="col-md-12">
+      <div class="event-list">
+        <div class="event">
+          <pre>{{diffstat(diff)}}</pre>
+        </div>
+        {# God, working with <pre> tags is such a fucking mess #}
+        {% for patch in diff %}
+        <pre style="margin-bottom: 0;"
+        >{#
+          #}{{patch.delta.status_char()}} {% if parent %}<a
+           href="{{url_for("repo.tree",
+              owner=repo.owner.canonical_name,
+              repo=repo.name,
+              ref=parent.id.hex,
+              path=patch.delta.old_file.path)}}"
+           id="{{patch.delta.old_file.path}}"
+         >{{patch.delta.old_file.path}}</a>{#
+         #}{% endif %} =&gt; {#
+         #}<a
+           href="{{url_for("repo.tree",
+              owner=repo.owner.canonical_name,
+              repo=repo.name,
+              ref=commit.id.hex,
+              path=patch.delta.new_file.path)}}"
+           id="{{patch.delta.new_file.path}}"
+         >{{patch.delta.new_file.path}}</a>{#
+         #} <span class="pull-right"><span class="text-success">+{{patch.line_stats[1]}}</span>{#
+         #} <span class="text-danger">-{{patch.line_stats[2]}}</span></span>{%
+            if patch.delta.old_file.mode != patch.delta.new_file.mode %}{#
+          #}{#
+          #}{% endif %}</pre>
+        <div class="event diff">
+          <pre>{% for hunk in patch.hunks %}
+{% set hunk_index = loop.index %}<strong
+  class="text-info"
+>@@ {#
+#}{% if parent %}<a
+  style="text-decoration: underline"
+  href="{{url_for("repo.tree",
+    owner=repo.owner.canonical_name,
+    repo=repo.name,
+    ref=parent.id.hex,
+    path=patch.delta.old_file.path)}}#L{{hunk.old_start}}"
+>{{hunk.old_start}}</a>,{{hunk.old_lines}} {#
+#}{% endif %}<a
+  style="text-decoration: underline"
+  href="{{url_for("repo.tree",
+    owner=repo.owner.canonical_name,
+    repo=repo.name,
+    ref=commit.id.hex,
+    path=patch.delta.new_file.path)}}#L{{hunk.new_start}}"
+>{{hunk.new_start}}</a>,{{hunk.new_lines}} {#
+#}@@</strong
+>{% if hunk.old_start == 0 %}
+{% endif %}{% for line in hunk.lines
+%}<span class="{{({
+  "+":"text-success",
+  "-":"text-danger",
+  }).get(line.origin) or ""}}"><a
+    href="#{{patch.delta.old_file.path}}-{{hunk_index}}-{{loop.index}}"
+    id="{{patch.delta.old_file.path}}-{{hunk_index}}-{{loop.index}}"
+    style="color: inherit"
+>{{line.origin}}</a>{%
+  if loop.first and hunk.old_start != 0
+%}{{line.content.lstrip()}}{%
+  else
+%} {{line.content}}{%
+  endif
+%}</span>{% endfor %}
+{% endfor %}</pre>
+        </div>
+        {% endfor %}
+      </div>
+    </div>
+</div>
+{% endblock %}
diff --git a/gitsrht/templates/log.html b/gitsrht/templates/log.html
index 07d8b7a..ae99229 100644
--- a/gitsrht/templates/log.html
+++ b/gitsrht/templates/log.html
@@ -6,7 +6,9 @@
     <div class="col-md-12">
       <div class="event-list">
         {% for c in commits[:-1] %}
-        {{ utils.commit_event(repo, c, commit_time, None, True, refs) }}
+        <div class="event">
+          {{ utils.commit_event(repo, c, commit_time, None, True, refs) }}
+        </div>
         {% endfor %}
       </div>
       <a
diff --git a/gitsrht/templates/summary.html b/gitsrht/templates/summary.html
index 89dda4b..19a565d 100644
--- a/gitsrht/templates/summary.html
+++ b/gitsrht/templates/summary.html
@@ -13,7 +13,9 @@
     <div class="col-md-6">
       <div class="event-list" style="margin-bottom: 0.5rem">
         {% for c in commits %}
-        {{ utils.commit_event(repo, c, commit_time, trim_commit) }}
+        <div class="event">
+          {{ utils.commit_event(repo, c, commit_time, trim_commit) }}
+        </div>
         {% endfor %}
       </div>
     </div>
diff --git a/gitsrht/templates/utils.html b/gitsrht/templates/utils.html
index 629d0e2..80cbd76 100644
--- a/gitsrht/templates/utils.html
+++ b/gitsrht/templates/utils.html
@@ -17,43 +17,63 @@
 endif %}{% endfor %}
 {% endmacro %}
 
-{% macro commit_event(repo, c, commit_time, trim_commit, full_body=False, refs={}) %}
-<div class="event">
-  <div>
-    <a
-      href="#"
-      title="{{c.id.hex}}"
-    >{{c.id.hex[:8]}}</a> &mdash;
-    <a href="#">{{c.author.name}}</a>
-    <a
-      id="log-{{c.id}}"
-      href="#log-{{c.id}}"
-      class="text-muted pull-right"
-    >{{ commit_time(c) | date }}</a>
-    {% if c.id.hex in refs %}
-    {% for ref in refs[c.id.hex] %}
-    <a
-      class="ref {{ref.type}}
-        {{"annotated" if ref.type == "tag" and ref.tag.message else ""}}"
-      {% if ref.type == "branch" %}
-      href="{{url_for("repo.tree",
-        owner=repo.owner.canonical_name, repo=repo.name, ref=ref.name)}}"
-      {% else %}
-      {# TODO: Annotated tag page #}
-      href="#"
-      {% endif %}
-    >{{ref.name}}</a>
+{% macro commit_event(
+  repo, c, commit_time, trim_commit,
+  full_body=False, refs={}, full_id=False, parents=False,
+  any=None) %}
+<div>
+  {% if full_id %}
+  {{c.id.hex}}
+  {% else %}
+  <a
+    href="{{url_for("repo.commit", owner=repo.owner.canonical_name,
+      repo=repo.name, ref=c.id.hex)}}"
+    title="{{c.id.hex}}"
+  >{{c.id.hex[:8]}}</a>
+  {% endif %}
+  &mdash;
+  <a href="#">{{c.author.name}}</a>
+  <a
+    id="log-{{c.id}}"
+    href="#log-{{c.id}}"
+    class="text-muted pull-right"
+  >{{ commit_time(c) | date }}</a>
+
+  {% if parents and any(c.parents) %}
+  <span style="margin-left: 0.5rem">
+    {{icon('code-branch', cls="sm")}}
+    {% for parent in c.parents %}
+    <a href="{{url_for("repo.commit",
+      owner=repo.owner.canonical_name,
+      repo=repo.name,
+      ref=parent.id.hex)}}"
+    >{{parent.short_id}}</a>
+    {% if not loop.last %}
+    +
+    {% endif %}
     {% endfor %}
+  </span>
+  {% endif %}
+
+  {% if c.id.hex in refs %}
+  {% for ref in refs[c.id.hex] %}
+  <a
+    class="ref {{ref.type}}
+      {{"annotated" if ref.type == "tag" and ref.tag.message else ""}}"
+    {% if ref.type == "branch" %}
+    href="{{url_for("repo.tree",
+      owner=repo.owner.canonical_name, repo=repo.name, ref=ref.name)}}"
+    {% else %}
+    {# TODO: Annotated tag page #}
+    href="#"
     {% endif %}
-  </div>
-  {% if full_body %}
-  <pre
-    style="padding-left: 0; padding-right: 0; background: transparent"
-  >{{c.message}}</pre>
-  {% else %}
-  <pre
-    style="padding-left: 0; padding-right: 0; background: transparent"
-  >{{ trim_commit(c.message) }}</pre>
+  >{{ref.name}}</a>
+  {% endfor %}
   {% endif %}
 </div>
+{% if full_body %}
+<pre>{{c.message}}</pre>
+{% else %}
+<pre>{{ trim_commit(c.message) }}</pre>
+{% endif %}
 {% endmacro %}
diff --git a/scss/main.scss b/scss/main.scss
index 4a2a7cd..4eeb3da 100644
--- a/scss/main.scss
+++ b/scss/main.scss
@@ -16,6 +16,12 @@
   background: #ddd;
 }
 
+pre {
+  padding-left: 0;
+  padding-right: 0;
+  background: transparent;
+}
+
 .tree-list {
   display: grid;
   // mode name
@@ -72,6 +78,9 @@
     grid-row-start: 1;
     border-right: 1px solid #444;
     text-align: right;
+    padding-left: 0.5rem;
+    padding-right: 0.5rem;
+    background: #eee;
   }
 
   .highlight {
@@ -110,7 +119,7 @@
 .ref {
   border-width: 1px;
   border-style: solid;
-  padding: 0.2rem;
+  padding: 0.1rem 0.2rem;
 
   &.branch {
     border-color: darken($info, 20);
@@ -130,3 +139,13 @@
     color: $white;
   }
 }
+
+.diff {
+  .text-danger {
+    color: darken($danger, 10) !important;
+  }
+
+  .text-success {
+    color: darken($success, 10) !important;
+  }
+}