Add clang-format and markdownlint (#9)

Author: kahrendt

.clang-format

@@ -0,0 +1,100 @@
+# time-filter clang-format configuration
+
+Language: Cpp
+Standard: c++20
+
+# Base style
+BasedOnStyle: Google
+
+# Indentation
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+ContinuationIndentWidth: 4
+IndentCaseLabels: true
+IndentPPDirectives: None
+NamespaceIndentation: None
+
+# Line width
+ColumnLimit: 100
+
+# Braces
+BreakBeforeBraces: Attach
+Cpp11BracedListStyle: true
+
+# Alignment
+AlignAfterOpenBracket: Align
+AlignConsecutiveAssignments: false
+AlignConsecutiveDeclarations: false
+AlignEscapedNewlines: Left
+AlignOperands: true
+AlignTrailingComments: true
+
+# Short forms
+AllowShortBlocksOnASingleLine: Empty
+AllowShortCaseLabelsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLoopsOnASingleLine: false
+AllowShortLambdasOnASingleLine: All
+
+# Breaking
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+BinPackArguments: true
+BinPackParameters: true
+BreakBeforeBinaryOperators: None
+BreakBeforeTernaryOperators: true
+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: BeforeColon
+BreakStringLiterals: true
+
+# Constructor initializers
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ConstructorInitializerIndentWidth: 4
+
+# Spaces
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: true
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+SpacesBeforeTrailingComments: 2
+SpacesInAngles: false
+SpacesInCStyleCastParentheses: false
+SpacesInContainerLiterals: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+
+# Pointer/Reference alignment
+DerivePointerAlignment: false
+PointerAlignment: Left
+
+# Include sorting
+IncludeBlocks: Regroup
+IncludeCategories:
+  # Project headers (quoted)
+  - Regex: '^"'
+    Priority: 1
+  # Standard library headers
+  - Regex: '^<[a-z_]+>'
+    Priority: 3
+  # Other headers
+  - Regex: '.*'
+    Priority: 2
+SortIncludes: true
+
+# Other
+AccessModifierOffset: -4
+CompactNamespaces: false
+FixNamespaceComments: true
+MaxEmptyLinesToKeep: 1
+ReflowComments: true
+SortUsingDeclarations: true

.github/workflows/ci.yml

@@ -0,0 +1,41 @@
+---
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  pre-commit:
+    name: Pre-commit checks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: '3.12'
+
+      - uses: esphome/pre-commit-action@43cd1109c09c544d97196f7730ee5b2e0cc6d81e # v3.0.1 fork with pinned actions/cache
+
+  ci:
+    name: CI
+    needs: [pre-commit]
+    runs-on: ubuntu-latest
+    if: always()
+    steps:
+      - name: Verify all jobs passed
+        run: |
+          if [[ "${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}" == "true" ]]; then
+            echo "One or more jobs failed or were cancelled"
+            exit 1
+          fi

.markdownlint.yaml

@@ -0,0 +1,3 @@
+# Markdownlint configuration
+default: true
+MD013: false  # Disable line length limit

.pre-commit-config.yaml

@@ -0,0 +1,23 @@
+---
+# See https://pre-commit.com for more information
+
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v18.1.8
+    hooks:
+      - id: clang-format
+        types_or: [c, c++]
+        # Only format our own code, not submodules or build directories
+        files: ^cpp/
+        exclude: (build/|\.pio/)
+
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.42.0
+    hooks:
+      - id: markdownlint-fix