From b9dbf59a986cd219097c8cbccc75cff224f6a866 Mon Sep 17 00:00:00 2001
From: Martin Thomson <mt@lowentropy.net>
Date: Tue, 9 Jan 2024 02:41:11 +1100
Subject: [PATCH] Run pre-commit using a python venv

This ensures that you don't need to rely on the environment quite so
much.

Also: Add .gitignore for venv dir
---
 .gitignore |  3 +++
 pre-commit | 16 +++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..bb03f1e9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.swp
+*~
+/venv/
diff --git a/pre-commit b/pre-commit
index 6f728692..f292f581 100755
--- a/pre-commit
+++ b/pre-commit
@@ -7,6 +7,7 @@
 # $ ln -s ../../hooks/pre-commit .git/pre-commit
 
 root="$(git rev-parse --show-toplevel 2>/dev/null)"
+venv="$root/venv"
 
 # Some sanity checking.
 hash python3 || exit 1
@@ -17,7 +18,7 @@ if [[ "$1" == "install" ]]; then
     hook="$root"/.git/hooks/pre-commit
     if [[ -e "$hook" ]]; then
         echo "Hook already installed:"
-	ls -l "$hook"
+        ls -l "$hook"
     else
         ln -s ../../pre-commit "$hook"
         echo "Installed git pre-commit hook at $hook"
@@ -25,6 +26,19 @@ if [[ "$1" == "install" ]]; then
     exit
 fi
 
+# venv setup
+if [ ! -d "$venv" ]; then
+    echo "Setting up python venv"
+    python3 -m venv "$venv"
+    source "$venv/bin/activate"
+    pip3 install -r requirements.txt
+elif [ requirements.txt -nt "$venv" ]; then
+    source "$venv/bin/activate"
+    pip3 install --upgrade --upgrade-stategy eager -r requirements.txt
+else
+    source "$venv/bin/activate"
+fi
+
 exec 1>&2
 
 # Perform validation.