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feat: add frontmatter validation for new docs
Validates title, description, keywords (1-3 items) in new docs files. Signed-off-by: Marcin Skalski <skalskimarcin33@gmail.com>
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‎.github/workflows/ci.yml‎

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@@ -198,3 +198,20 @@ jobs:
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env:
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BASE_BRANCH: origin/${{ github.base_ref }}
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run: mise vale:version-urls
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frontmatter:
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name: Validate frontmatter
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runs-on: ubuntu-24.04
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steps:
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- uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
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with:
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fetch-depth: 0
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- uses: jdx/mise-action@be3be2260bc02bc3fbf94c5e2fed8b7964baf074 # v3.4.0
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env:
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GITHUB_TOKEN: ${{ github.token }}
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- name: Fetch base branch
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run: git fetch origin ${{ github.base_ref }}:${{ github.base_ref }}
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- name: Validate frontmatter in new docs
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env:
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BASE_BRANCH: origin/${{ github.base_ref }}
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run: mise frontmatter:validate

‎.github/workflows/test-tools.yml‎

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name: Test tools
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on:
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push:
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branches: [master]
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paths: [tools/**]
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pull_request:
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paths: [tools/**]
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jobs:
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test-tools:
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name: Test tool scripts
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runs-on: ubuntu-24.04
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steps:
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- uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
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- uses: jdx/mise-action@be3be2260bc02bc3fbf94c5e2fed8b7964baf074 # v3.4.0
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env:
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GITHUB_TOKEN: ${{ github.token }}
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- name: Run tool tests
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run: mise test:tools

‎mise.toml‎

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@@ -106,6 +106,14 @@ git diff --name-only --diff-filter=d origin/master...HEAD | \
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description = "Check for hardcoded version URLs in changed files"
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run = "tools/check-version-urls.sh"
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[tasks."frontmatter:validate"]
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description = "Validate frontmatter in new docs files"
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run = "tools/validate-frontmatter.sh"
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[tasks."test:tools"]
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description = "Run all tool tests (tools/test-*.sh)"
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run = "for f in tools/test-*.sh; do [ -x \"$f\" ] && \"$f\"; done"
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[tasks.check]
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description = "Run vale and link checker (requires dev server running at localhost:7777)"
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depends = ["vale:branch", "vale:version-urls", "links:check"]
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description = "Run necessary checks"
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depends = ["vale:branch", "vale:version-urls", "frontmatter:validate"]

‎tools/test-validate-frontmatter.sh‎

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#!/usr/bin/env bash
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set -euo pipefail
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# Tests for validate-frontmatter.sh
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# Runs validation logic against fixture files without git
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SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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FIXTURES_DIR="$SCRIPT_DIR/test-fixtures/frontmatter"
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PASSED=0
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FAILED=0
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# Create fixtures directory
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mkdir -p "$FIXTURES_DIR"
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# Helper to run validation on a single file
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validate_file() {
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local file="$1"
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local ERRORS=0
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FRONTMATTER=$(awk '/^---$/{if(++c==2)exit; next}c==1' "$file")
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if [ -z "$FRONTMATTER" ]; then
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echo "no-frontmatter"
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return
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fi
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if ! echo "$FRONTMATTER" | grep -qE '^title:'; then
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ERRORS=$((ERRORS + 1))
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fi
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if ! echo "$FRONTMATTER" | grep -qE '^description:'; then
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ERRORS=$((ERRORS + 1))
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fi
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if ! echo "$FRONTMATTER" | grep -qE '^keywords:'; then
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ERRORS=$((ERRORS + 1))
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else
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KEYWORDS_COUNT=$(echo "$FRONTMATTER" | awk '/^keywords:/{f=1;next} f && /^[a-z]/{exit} f && /^ *-/' | wc -l | tr -d ' ')
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if [ "$KEYWORDS_COUNT" -lt 1 ]; then
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ERRORS=$((ERRORS + 1))
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elif [ "$KEYWORDS_COUNT" -gt 3 ]; then
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ERRORS=$((ERRORS + 1))
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fi
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fi
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echo "$ERRORS"
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}
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# Test helper
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test_case() {
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local name="$1"
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local expected="$2"
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local file="$3"
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result=$(validate_file "$file")
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if [ "$result" = "$expected" ]; then
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echo "✓ $name"
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PASSED=$((PASSED + 1))
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else
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echo "✗ $name (expected: $expected, got: $result)"
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FAILED=$((FAILED + 1))
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fi
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}
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echo "Creating test fixtures..."
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# Valid file with all fields
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cat > "$FIXTURES_DIR/valid.md" << 'EOF'
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---
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title: Valid Page
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description: This is a valid page with all required fields
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keywords:
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- test
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- valid
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---
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# Content
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EOF
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# Valid with 1 keyword
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cat > "$FIXTURES_DIR/valid-1-keyword.md" << 'EOF'
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---
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title: Valid Page
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description: This is valid
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keywords:
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- single
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---
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# Content
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EOF
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# Valid with 3 keywords
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cat > "$FIXTURES_DIR/valid-3-keywords.md" << 'EOF'
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---
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title: Valid Page
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description: This is valid
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keywords:
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- one
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- two
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- three
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---
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# Content
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EOF
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# Missing description
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cat > "$FIXTURES_DIR/missing-description.md" << 'EOF'
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---
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title: Missing Description
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keywords:
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- test
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---
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# Content
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EOF
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# Missing keywords
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cat > "$FIXTURES_DIR/missing-keywords.md" << 'EOF'
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---
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title: Missing Keywords
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description: No keywords here
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---
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# Content
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EOF
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# Missing title
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cat > "$FIXTURES_DIR/missing-title.md" << 'EOF'
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---
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description: No title here
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keywords:
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- test
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---
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# Content
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EOF
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# Too many keywords (4)
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cat > "$FIXTURES_DIR/too-many-keywords.md" << 'EOF'
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---
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title: Too Many Keywords
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description: Has 4 keywords
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keywords:
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- one
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- two
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- three
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- four
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---
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# Content
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EOF
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# Empty keywords array
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cat > "$FIXTURES_DIR/empty-keywords.md" << 'EOF'
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---
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title: Empty Keywords
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description: Keywords field exists but empty
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keywords:
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---
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# Content
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EOF
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# No frontmatter
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cat > "$FIXTURES_DIR/no-frontmatter.md" << 'EOF'
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# Just Content
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No frontmatter here
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EOF
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# All fields missing
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cat > "$FIXTURES_DIR/all-missing.md" << 'EOF'
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---
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layout: page
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---
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# Content
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EOF
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echo ""
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echo "Running tests..."
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echo ""
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# Run tests
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test_case "valid file with all fields" "0" "$FIXTURES_DIR/valid.md"
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test_case "valid with 1 keyword" "0" "$FIXTURES_DIR/valid-1-keyword.md"
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test_case "valid with 3 keywords" "0" "$FIXTURES_DIR/valid-3-keywords.md"
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test_case "missing description" "1" "$FIXTURES_DIR/missing-description.md"
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test_case "missing keywords" "1" "$FIXTURES_DIR/missing-keywords.md"
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test_case "missing title" "1" "$FIXTURES_DIR/missing-title.md"
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test_case "too many keywords (4)" "1" "$FIXTURES_DIR/too-many-keywords.md"
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test_case "empty keywords array" "1" "$FIXTURES_DIR/empty-keywords.md"
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test_case "no frontmatter" "no-frontmatter" "$FIXTURES_DIR/no-frontmatter.md"
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test_case "all fields missing" "3" "$FIXTURES_DIR/all-missing.md"
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echo ""
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echo "Results: $PASSED passed, $FAILED failed"
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# Cleanup
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rm -rf "$FIXTURES_DIR"
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if [ $FAILED -gt 0 ]; then
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exit 1
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fi

‎tools/validate-frontmatter.sh‎

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#!/usr/bin/env bash
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set -euo pipefail
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# Validate frontmatter in new documentation files
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# Checks for required fields: title, description, keywords (1-3 items)
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# Usage: ./validate-frontmatter.sh [base-branch]
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BASE_BRANCH="${1:-${BASE_BRANCH:-origin/master}}"
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echo "Validating frontmatter in new docs files..."
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FILES_FOUND=0
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ERRORS=0
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# Get only NEW (added) markdown files in app/_src/
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while IFS= read -r file; do
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# Skip if no files
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[ -z "$file" ] && continue
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FILES_FOUND=1
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FILE_ERRORS=0
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# Extract frontmatter (between first two ---)
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FRONTMATTER=$(awk '/^---$/{if(++c==2)exit; next}c==1' "$file")
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if [ -z "$FRONTMATTER" ]; then
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echo "ERROR: $file - no frontmatter found"
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ERRORS=$((ERRORS + 1))
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continue
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fi
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# Check for title
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if ! echo "$FRONTMATTER" | grep -qE '^title:'; then
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echo "ERROR: $file - missing 'title' field"
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FILE_ERRORS=$((FILE_ERRORS + 1))
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fi
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# Check for description
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if ! echo "$FRONTMATTER" | grep -qE '^description:'; then
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echo "ERROR: $file - missing 'description' field"
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FILE_ERRORS=$((FILE_ERRORS + 1))
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fi
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# Check for keywords
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if ! echo "$FRONTMATTER" | grep -qE '^keywords:'; then
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echo "ERROR: $file - missing 'keywords' field"
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FILE_ERRORS=$((FILE_ERRORS + 1))
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else
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# Count keywords (lines starting with " - " after "keywords:")
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KEYWORDS_SECTION=$(echo "$FRONTMATTER" | awk '/^keywords:/{f=1;next} f && /^[a-z]/{exit} f && /^ *-/' | wc -l | tr -d ' ')
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if [ "$KEYWORDS_SECTION" -lt 1 ]; then
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echo "ERROR: $file - keywords must have at least 1 item"
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FILE_ERRORS=$((FILE_ERRORS + 1))
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elif [ "$KEYWORDS_SECTION" -gt 3 ]; then
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echo "ERROR: $file - keywords must have at most 3 items (found $KEYWORDS_SECTION)"
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FILE_ERRORS=$((FILE_ERRORS + 1))
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fi
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fi
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if [ $FILE_ERRORS -gt 0 ]; then
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ERRORS=$((ERRORS + FILE_ERRORS))
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fi
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done < <(git diff --name-only --diff-filter=A "${BASE_BRANCH}...HEAD" 2>/dev/null | \
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grep -E '^app/_src/.*\.(md|markdown)$' | \
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grep -v '/generated/' | \
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grep -v '/raw/' || true)
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if [ $FILES_FOUND -eq 0 ]; then
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echo "No new docs files found"
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exit 0
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fi
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if [ $ERRORS -gt 0 ]; then
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echo ""
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echo "Found $ERRORS frontmatter error(s)"
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echo ""
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echo "Required frontmatter format:"
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echo "---"
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echo "title: Page Title"
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echo "description: 1-2 sentence description for SEO"
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echo "keywords:"
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echo " - keyword1"
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echo " - keyword2"
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echo "---"
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exit 1
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fi
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echo "All frontmatter valid"

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