Setup toml formatting with taplo

In the Justfile, this is run via `uvx`
to avoid adding a build dependency

Author: Techcable

.taplo.toml

@@ -0,0 +1,7 @@
+[formatting]
+indent_string = "    "
+array_auto_collapse = false
+column_width = 120
+# this tries to line up comments after entries in a nice little table
+# these sorts of ASCII tables are far too fragile for my taste
+align_comments = false

Justfile

@@ -54,6 +54,9 @@ fix-spelling:
     # Fix obvious spelling issues
     typos --write-changes
 
+# taplo logging is excessively verbose (prints 'file detection' but not files changed)
+export RUST_LOG := "taplo=warn"
+
 # Checks for formatting issues
 check-format: && spellcheck
     @# Invoking ruff directly instead of through uv tool run saves ~12ms per command,
@@ -63,9 +66,13 @@ check-format: && spellcheck
     @# project dependencies, which can add an additional 100+ ms
     ruff format --check .
     ruff check --select I --output-format concise .
+    # check toml formatting
+    uvx taplo format --check
 
 format: _format && spellcheck
 
 _format:
     ruff format .
     ruff check --select 'I' --fix .
+    # format toml
+    uvx taplo format

_typos.toml

@@ -1,5 +1,5 @@
 [files]
-ignore-hidden = false  # we want dotfiles
+ignore-hidden = false # we want dotfiles
 extend-exclude = [
     ".git", # needed because we 'ignore-hidden'
 ]

lefthook.yml

@@ -16,6 +16,14 @@ pre-commit:
       tags: formatter
       glob: "*.{py,pyi}"
       run: ruff check --select 'I' --output-format 'concise' -- {staged_files}
+    taplo:
+      tags: formatter
+      glob: "*.toml"
+      # No need to --force-exclude for taplo
+      run: taplo format --check -- {staged_files}
+      env:
+        # without this, taplo is very verbose
+        RUST_LOG: warn
     typos:
       tags: spellcheck
       run: typos --force-exclude -- {staged_files}

pyproject.toml

@@ -23,15 +23,15 @@ pydantic = [
 ]
 
 [dependency-groups]
-mypy = ["mypy~=1.0", {include-group = "typing"}]
+mypy = ["mypy~=1.0", { include-group = "typing" }]
 test = [
     "pytest~=8.3",
     "pytest-asyncio>=0.26",
     "pytest-sugar~=1.0",
-    "techcable.orderedset[pydantic]"
+    "techcable.orderedset[pydantic]",
 ]
 typing = ["typing-extensions~=4.12", "techcable.orderedset[pydantic]"]
-dev = [{include-group = "mypy"}, {include-group = "test"}]
+dev = [{ include-group = "mypy" }, { include-group = "test" }]
 
 [project.urls]
 Source = "https://github.com/Techcable/orderedset.py"