From b2748a6cf3bee48cd2b426c3b407b6e28b9a46b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Corentin=20S=C3=A9chet?= <corentin@ki-dour.org>
Date: Tue, 21 May 2024 01:22:20 +0200
Subject: [PATCH] feat: add git_creation_date method

---
 jwebsite/git.py  | 26 ++++++++++++++++++++++++++
 jwebsite/site.py |  3 ++-
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 jwebsite/git.py

diff --git a/jwebsite/git.py b/jwebsite/git.py
new file mode 100644
index 0000000..8b4bfc1
--- /dev/null
+++ b/jwebsite/git.py
@@ -0,0 +1,26 @@
+from datetime import datetime
+from subprocess import check_output
+
+from jwebsite.content import Content
+
+
+def git_creation_date(content: Content) -> datetime:
+    git_dir = check_output(["git", "rev-parse", "--show-toplevel"], encoding="utf-8")
+    git_dir = git_dir.strip()
+    log = check_output(
+        [
+            "git",
+            "log",
+            "--pretty=format:%ad",
+            "--date=iso-strict",
+            "--diff-filter=A",
+            "--",
+            str(content.path.relative_to(git_dir)),
+        ],
+        encoding="utf-8",
+    )
+    log_lines = log.splitlines()
+    if len(log_lines) == 0:
+        return datetime.now()
+
+    return datetime.fromisoformat(log_lines[0])
diff --git a/jwebsite/site.py b/jwebsite/site.py
index 93de39d..a2b22d4 100644
--- a/jwebsite/site.py
+++ b/jwebsite/site.py
@@ -6,6 +6,7 @@ from jinja2.environment import Environment
 from jinja2.loaders import FileSystemLoader
 
 from jwebsite.content import ContentDirectory
+from jwebsite.git import git_creation_date
 
 
 class Site:
@@ -13,7 +14,7 @@ class Site:
         self.__root_directory = root_directory
         self.__output_directory = root_directory / "build"
         self.__environment = Environment(loader=FileSystemLoader(searchpath=root_directory / "src"))
-        self.__environment.filters.update({"output": self.__output})
+        self.__environment.filters.update({"output": self.__output, "git_creation_date": git_creation_date})
         self.__content = ContentDirectory(root_directory / "content")
 
     @property