Implement properties to get info from SnapshotProvider instance

lib/tfw/components/snapshot_provider.py

@@ -4,6 +4,7 @@
 from subprocess import run
 from getpass import getuser
 from os.path import isdir
+from datetime import datetime
 
 
 class SnapshotProvider:
@@ -15,7 +16,8 @@ class SnapshotProvider:
             'GIT_AUTHOR_NAME': author,
             'GIT_AUTHOR_EMAIL': '',
             'GIT_COMMITTER_NAME': author,
-            'GIT_COMMITTER_EMAIL': ''
+            'GIT_COMMITTER_EMAIL': '',
+            'GIT_PAGER': 'cat'
         }
 
         self._check_environment()
@@ -58,7 +60,7 @@ class SnapshotProvider:
 
     def restore_snapshot(self, date):
         commit = self._get_commit_from_timestamp(date)
-        self._checkout_commit(commit)
+        self._checkout(commit)
         self._head_detached = True
 
     def _get_commit_from_timestamp(self, date):
@@ -70,10 +72,10 @@ class SnapshotProvider:
             self._branch
         ))
 
-    def _checkout_commit(self, commit):
+    def _checkout(self, what):
         self._run((
             'git', 'checkout',
-            commit
+            what
         ))
 
     def _get_stdout(self, *args, **kwargs):
@@ -85,3 +87,35 @@ class SnapshotProvider:
         if 'env' not in kwargs:
             kwargs['env'] = self.gitenv
         return run(*args, **kwargs)
+
+    @property
+    def all_timelines(self):
+        return self._branches
+
+    @property
+    def timeline(self):
+        return self._branch
+
+    @timeline.setter
+    def timeline(self, value):
+        self._checkout(value)
+
+    @property
+    def snapshots(self):
+        return self._pretty_log_branch()
+
+    def _pretty_log_branch(self):
+        git_log_output = self._get_stdout((
+            'git', 'log',
+            '--pretty=%H@%aI'
+        ))
+
+        commits = []
+        for line in git_log_output.splitlines():
+            commit_hash, timestamp = line.split('@')
+            commits.append({
+                'hash': commit_hash,
+                'timestamp': datetime.fromisoformat(timestamp)
+            })
+
+        return commits