Add prek-based pre-commit workflow

.gitignore

@@ -4,6 +4,7 @@
 .python-version
 .idea/
 .direnv/
+/var/
 
 # ignore roles pulled by ansible-galaxy
 /roles/galaxy/*

.pre-commit-config.yaml

@@ -1,7 +1,6 @@
 ---
-default_install_hook_types: [pre-push]
 
-exclude: "LICENSES/"
+exclude: "^(LICENSES/|var/)"
 
 # See: https://pre-commit.com/hooks.html
 repos:
@@ -24,3 +23,10 @@ repos:
     rev: v6.2.0
     hooks:
       - id: reuse
+  - repo: https://github.com/ansible/ansible-lint
+    rev: v26.3.0
+    hooks:
+      - id: ansible-lint
+        files: '^roles/custom/'
+        args: ['roles/custom']
+        pass_filenames: false

flake.nix

@@ -19,6 +19,7 @@
           devShells.default = mkShell {
             buildInputs = [
               just
+              mise
               ansible
             ];
             shellHook = ''

justfile

@@ -4,6 +4,11 @@
 #
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
+# mise (dev tool version manager)
+mise_data_dir := env("MISE_DATA_DIR", justfile_directory() / "var/mise")
+mise_trusted_config_paths := justfile_directory() / "mise.toml"
+prek_home := env("PREK_HOME", justfile_directory() / "var/prek")
+
 # Shows help
 default:
     @{{ just_executable() }} --list --justfile "{{ justfile() }}"
@@ -39,9 +44,39 @@ update-playbook-only:
     @git pull -q
     @-git stash pop -q
 
-# Runs ansible-lint against all roles in the playbook
-lint:
-    ansible-lint
+# Invokes mise with the project-local data directory
+mise *args: _ensure_mise_data_directory
+    #!/bin/sh
+    export MISE_DATA_DIR="{{ mise_data_dir }}"
+    export MISE_TRUSTED_CONFIG_PATHS="{{ mise_trusted_config_paths }}"
+    export MISE_YES=1
+    export PREK_HOME="{{ prek_home }}"
+    mise {{ args }}
+
+# Runs prek (pre-commit hooks manager) with the given arguments
+prek *args: _ensure_mise_tools_installed
+    @{{ just_executable() }} --justfile "{{ justfile() }}" mise exec -- prek {{ args }}
+
+# Runs pre-commit hooks on staged files
+prek-run-on-staged *args: _ensure_mise_tools_installed
+    @{{ just_executable() }} --justfile "{{ justfile() }}" prek run {{ args }}
+
+# Runs pre-commit hooks on all files
+prek-run-on-all *args: _ensure_mise_tools_installed
+    @{{ just_executable() }} --justfile "{{ justfile() }}" prek run --all-files {{ args }}
+
+# Installs the git pre-commit hook
+prek-install-git-pre-commit-hook: _ensure_mise_tools_installed
+    #!/usr/bin/env sh
+    set -eu
+    {{ just_executable() }} --justfile "{{ justfile() }}" mise exec -- prek install
+    hook="{{ justfile_directory() }}/.git/hooks/pre-commit"
+    # The installed git hook runs later under Git, outside this just/mise environment.
+    # Injecting PREK_HOME keeps prek's cache under var/prek instead of a global home dir,
+    # which is more predictable and works better in sandboxed tools like Codex/OpenCode.
+    if [ -f "$hook" ] && ! grep -q '^export PREK_HOME=' "$hook"; then
+        sed -i '2iexport PREK_HOME="{{ prek_home }}"' "$hook"
+    fi
 
 # Runs the playbook with --tags=install-all,ensure-matrix-users-created,start and optional arguments
 install-all *extra_args: (run-tags "install-all,ensure-matrix-users-created,start" extra_args)
@@ -84,3 +119,12 @@ stop-group group *extra_args:
 # Rebuilds the mautrix-meta-instagram Ansible role using the mautrix-meta-messenger role as a source
 rebuild-mautrix-meta-instagram:
     /bin/bash "{{ justfile_directory() }}/bin/rebuild-mautrix-meta-instagram.sh" "{{ justfile_directory() }}/roles/custom"
+
+# Internal - ensures var/mise and var/prek directories exist
+_ensure_mise_data_directory:
+    @mkdir -p "{{ mise_data_dir }}"
+    @mkdir -p "{{ prek_home }}"
+
+# Internal - ensures mise tools are installed
+_ensure_mise_tools_installed: _ensure_mise_data_directory
+    @{{ just_executable() }} --justfile "{{ justfile() }}" mise install --quiet

mise.toml

@@ -0,0 +1,9 @@
+# SPDX-FileCopyrightText: 2026 Slavi Pantaleev
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+[tools]
+prek = "0.3.2"
+
+[settings]
+yes = true