Simplify dotfile utilities

.github/workflows/ci.yml

@@ -0,0 +1,67 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install linters
+        run: |
+          sudo apt-get update
+          sudo apt-get install --yes fish shellcheck
+
+      - name: Check Bash
+        run: |
+          bash -n bin/* bootstrap/linux/* bootstrap/macos/*
+          shellcheck --external-sources --exclude=SC2155 bin/* bootstrap/linux/* bootstrap/macos/*
+
+      - name: Check Fish
+        run: fish -n fish/config.fish fish/conf.d/*.fish fish/functions/*.fish
+
+      - name: Check PowerShell
+        shell: pwsh
+        run: |
+          $tokens = $null
+          $errors = $null
+          [System.Management.Automation.Language.Parser]::ParseFile(
+            (Resolve-Path ./windows.ps1),
+            [ref]$tokens,
+            [ref]$errors
+          ) | Out-Null
+
+          if ($errors.Count -gt 0) {
+            $errors | ForEach-Object { Write-Error $_ }
+            exit 1
+          }
+
+      - name: Check TOML
+        run: |
+          python3 - <<'PY'
+          import pathlib
+          import subprocess
+          import tomllib
+
+          paths = [pathlib.Path(filename) for filename in subprocess.check_output(
+              ['git', 'ls-files', '--', '*.toml'],
+              text=True,
+          ).splitlines()]
+
+          for path in paths:
+              with path.open('rb') as config:
+                  tomllib.load(config)
+          PY
+
+      - name: Check whitespace
+        run: git diff --check

README.md

@@ -76,3 +76,13 @@ Preview bootstrap changes or inspect current state:
 mise bootstrap --dry-run
 mise bootstrap status
 ```
+
+## Utilities
+
+Rename photos from their EXIF timestamps, without changing anything first:
+
+```sh
+photon /path/to/photos --dry-run
+```
+
+Remove `--dry-run` to apply names in the `IMG_yyyyMMdd_HHmmss` format. Duplicate timestamps receive a numeric suffix.

bin/git-update

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# Fetch updates and delete local branches whose upstream no longer exists.
+
+set -euo pipefail
+
+git fetch --prune
+git for-each-ref --format='%(refname:short) %(upstream:track)' refs/heads |
+  awk '$NF == "[gone]" {print $1}' |
+  while IFS= read -r branch; do
+    git branch -D -- "$branch"
+  done