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821 lines (707 loc) · 26.3 KB
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// @purpose Writer tool
// @description Expand and restore Liquid data references in content files
// Usage: npm run liquid-tags -- expand --paths content/pull-requests/about.md
// Usage: npm run liquid-tags -- restore --paths content/pull-requests/about.md
import { Command } from 'commander'
import fs from 'fs'
import path from 'path'
import { load, dump } from 'js-yaml'
import chalk from 'chalk'
interface ExpandOptions {
paths: string[]
verbose?: boolean
markers?: boolean
dryRun?: boolean
reusablesOnly?: boolean
variablesOnly?: boolean
shallow?: boolean
}
interface LiquidReference {
original: string
type: 'reusable' | 'variable'
path: string
startIndex: number
endIndex: number
}
const ROOT = process.env.ROOT || '.'
const DATA_ROOT = path.resolve(path.join(ROOT, 'data'))
const REUSABLES_ROOT = path.join(DATA_ROOT, 'reusables')
const VARIABLES_ROOT = path.join(DATA_ROOT, 'variables')
function getErrorMessage(error: unknown): string {
return error instanceof Error ? error.message : String(error)
}
const EXPANDED_PATTERN = /<!-- begin (reusable|variable)s\.([^>]+) -->(.+?)<!-- end \1s\.\2 -->/gs
// Reject absolute, traversal, empty, and unsafe data paths before resolving under data root.
function getDataFilePath(type: 'reusable' | 'variable', dataPath: string): string {
if (path.isAbsolute(dataPath)) {
throw new Error(`Invalid ${type} data path: absolute paths are not allowed: ${dataPath}`)
}
const segments = dataPath.split(/[\\/]/)
if (segments.some((segment) => segment === '..' || segment === '')) {
throw new Error(`Invalid ${type} data path: contains disallowed segments: ${dataPath}`)
}
// Restrict data paths to filename characters used by reusables and variables.
if (!/^[A-Za-z0-9_.\-/]+$/.test(dataPath)) {
throw new Error(`Invalid ${type} data path: contains disallowed characters: ${dataPath}`)
}
if (type === 'reusable') {
const baseRoot = path.resolve(REUSABLES_ROOT)
const relativePath = dataPath.replace(/\./g, '/')
const candidatePath = path.resolve(baseRoot, `${relativePath}.md`)
if (!candidatePath.startsWith(baseRoot + path.sep)) {
throw new Error(`Invalid reusable data path: escapes reusables root: ${dataPath}`)
}
return candidatePath
} else {
const baseRoot = path.resolve(VARIABLES_ROOT)
const fileName = dataPath.split('.')[0]
const candidatePath = path.resolve(baseRoot, `${fileName}.yml`)
if (!candidatePath.startsWith(baseRoot + path.sep)) {
throw new Error(`Invalid variable data path: escapes variables root: ${dataPath}`)
}
return candidatePath
}
}
function convertFilePathToDataPath(filePath: string): string {
const normalizedPath = path.normalize(filePath)
if (normalizedPath.includes('reusables')) {
const relativePath = path.relative(REUSABLES_ROOT, normalizedPath)
return `reusables.${relativePath.replace(/\.md$/, '').replace(/[\\/]/g, '.')}`
} else if (normalizedPath.includes('variables')) {
const relativePath = path.relative(VARIABLES_ROOT, normalizedPath)
return `variables.${relativePath.replace(/\.yml$/, '').replace(/[\\/]/g, '.')}`
}
return filePath
}
const program = new Command()
program
.name('liquid-tags')
.description('Tools to expand and restore Liquid data references in content files')
program
.command('expand')
.description('Expand {% data reusables %} and {% data variables %} statements to their content')
.option('--paths <paths...>', 'Content file paths to process', [])
.option('-v, --verbose', 'Verbose output', false)
.option('--no-markers', 'Skip HTML comment markers (output cannot be restored to Liquid)', true)
.option('--reusables-only', 'Process only reusables (skip variables)', false)
.option('--variables-only', 'Process only variables (skip reusables)', false)
.option('--shallow', 'Expand only one level (do not expand nested references)', false)
.action((options: ExpandOptions) => expandReferences(options))
program
.command('restore')
.description('Restore original Liquid statements from HTML comment markers')
.option('--paths <paths...>', 'Content file paths to process', [])
.option('-v, --verbose', 'Verbose output', false)
.option('--reusables-only', 'Process only reusables (skip variables)', false)
.option('--variables-only', 'Process only variables (skip reusables)', false)
.action((options: ExpandOptions) => restoreReferences(options))
program.parse()
function getAllowedTypes(options: ExpandOptions): Array<'reusable' | 'variable'> {
if (options.reusablesOnly && options.variablesOnly) {
console.log(
chalk.yellow(
'Warning: Both --reusables-only and --variables-only specified. Processing both types.',
),
)
return ['reusable', 'variable']
}
if (options.reusablesOnly) {
return ['reusable']
}
if (options.variablesOnly) {
return ['variable']
}
return ['reusable', 'variable']
}
async function expandReferences(options: ExpandOptions): Promise<void> {
const { paths, verbose, markers, shallow } = options
// --no-markers sets markers to false; missing flag leaves it true.
const withMarkers = markers !== false
const recursive = !shallow // Omitting --shallow enables recursive expansion.
const allowedTypes = getAllowedTypes(options)
const maxIterations = 10 // Stop recursive expansion after 10 passes to avoid circular references.
if (paths.length === 0) {
console.error(chalk.red('Error: No paths provided. Use --paths option.'))
process.exit(1)
}
for (const filePath of paths) {
try {
let iteration = 0
let hasRemainingRefs = true
while (hasRemainingRefs && iteration < maxIterations) {
iteration++
if (verbose && recursive && iteration > 1) {
console.log(chalk.blue(`Processing (iteration ${iteration}): ${filePath}`))
} else if (verbose) {
console.log(chalk.blue(`Processing: ${filePath}`))
if (allowedTypes.length < 2) {
console.log(chalk.dim(` Only processing: ${allowedTypes.join(', ')}`))
}
}
if (!fs.existsSync(filePath)) {
console.error(chalk.red(`Error: File not found: ${filePath}`))
break
}
const content = fs.readFileSync(filePath, 'utf-8')
const expandedContent = await expandFileContent(
content,
filePath,
verbose,
withMarkers,
allowedTypes,
)
if (expandedContent !== content) {
fs.writeFileSync(filePath, expandedContent, 'utf-8')
if (iteration === 1 || !recursive) {
console.log(chalk.green(`✓ Expanded references in: ${filePath}`))
}
} else {
if (verbose && iteration === 1) {
console.log(chalk.gray(` No references found in: ${filePath}`))
}
}
const remainingRefs = findLiquidReferences(expandedContent, allowedTypes)
hasRemainingRefs = remainingRefs.length > 0
if (shallow) {
if (hasRemainingRefs) {
console.log(
chalk.yellow(
`👉 FYI: ${remainingRefs.length} Liquid reference(s) remain in ${filePath}`,
),
)
console.log(
chalk.yellow(
' These come from reusables/variables that contain references to other reusables/variables',
),
)
console.log(
chalk.yellow(
' Run the expand command again to expand them, or omit --shallow for full expansion',
),
)
if (verbose) {
for (const ref of remainingRefs) {
console.log(chalk.dim(` ${ref.original}`))
}
} else {
console.log(chalk.dim(' Use --verbose to see the specific references'))
}
}
break
}
if (hasRemainingRefs && iteration >= maxIterations) {
console.log(
chalk.yellow(`⚠️ Reached maximum iterations (${maxIterations}) for ${filePath}`),
)
console.log(
chalk.yellow(
` ${remainingRefs.length} reference(s) still remain - there may be circular references`,
),
)
if (verbose) {
for (const ref of remainingRefs) {
console.log(chalk.dim(` ${ref.original}`))
}
}
} else if (!hasRemainingRefs && iteration > 1) {
console.log(
chalk.green(
`✓ Fully expanded all references in: ${filePath} (${iteration} iterations)`,
),
)
}
}
} catch (error: unknown) {
console.error(chalk.red(`Error processing ${filePath}: ${getErrorMessage(error)}`))
}
}
}
async function restoreReferences(options: ExpandOptions): Promise<void> {
const { paths, verbose } = options
const allowedTypes = getAllowedTypes(options)
if (paths.length === 0) {
console.error(chalk.red('Error: No paths provided. Use --paths option.'))
process.exit(1)
}
// Compare every file with pre-restore data so a later unedited copy cannot overwrite an edit.
const restorePaths: string[] = []
const updates: ReturnType<typeof extractDataUpdates> = []
let hasAnyEdits = false
for (const filePath of paths) {
try {
if (verbose) {
console.log(chalk.blue(`Restoring: ${filePath}`))
if (allowedTypes.length < 2) {
console.log(chalk.dim(` Only processing: ${allowedTypes.join(', ')}`))
}
}
if (!fs.existsSync(filePath)) {
console.error(chalk.red(`Error: File not found: ${filePath}`))
continue
}
const content = fs.readFileSync(filePath, 'utf-8')
const hasEdits = await detectContentEdits(content, verbose, allowedTypes)
if (hasEdits) {
hasAnyEdits = true
console.log(
chalk.blue(
`${filePath} contains expanded references; any edits made will be preserved in data files`,
),
)
if (!verbose) {
console.log(chalk.dim(' Use --verbose to see details of the edits'))
}
updates.push(...extractDataUpdates(content, allowedTypes))
}
restorePaths.push(filePath)
} catch (error: unknown) {
console.error(chalk.red(`Error restoring ${filePath}: ${getErrorMessage(error)}`))
}
}
if (hasAnyEdits) {
// Write edited expanded blocks back to data files before restoring Liquid tags.
const updatedDataFiles = updateDataFiles(updates, verbose, false)
// Restore updated data files so nested references return to Liquid tags too.
if (updatedDataFiles.length > 0) {
if (verbose) console.log(chalk.blue(' Restoring updated data files back to liquid tags...'))
for (const dataFile of updatedDataFiles) {
try {
const dataContent = fs.readFileSync(dataFile, 'utf-8')
// Data files should never keep markers, whichever types were selected.
const restoredDataContent = restoreFileContent(dataContent, verbose)
if (restoredDataContent !== dataContent) {
fs.writeFileSync(dataFile, restoredDataContent, 'utf-8')
if (verbose) {
const dataPath = convertFilePathToDataPath(dataFile)
console.log(chalk.green(` Restored: ${dataPath}`))
}
}
} catch (error) {
if (verbose) {
const dataPath = convertFilePathToDataPath(dataFile)
console.log(chalk.yellow(` Could not restore ${dataPath}: ${error}`))
}
}
}
}
}
for (const filePath of restorePaths) {
try {
// Re-read so an input that is also an updated data file keeps its saved edit.
const content = fs.readFileSync(filePath, 'utf-8')
// Restore the main file even when no data file changed.
const restoredContent = restoreFileContent(content, verbose, allowedTypes)
if (restoredContent !== content) {
fs.writeFileSync(filePath, restoredContent, 'utf-8')
console.log(chalk.green(`✓ Restored references in: ${filePath}`))
} else {
console.log(chalk.gray(`No expanded references found in: ${filePath}`))
}
} catch (error: unknown) {
console.error(chalk.red(`Error restoring ${filePath}: ${getErrorMessage(error)}`))
}
}
}
async function expandFileContent(
content: string,
filePath: string,
verbose?: boolean,
withMarkers?: boolean,
allowedTypes?: Array<'reusable' | 'variable'>,
): Promise<string> {
const references = findLiquidReferences(content, allowedTypes)
if (references.length === 0) {
return content
}
let expandedContent = content
let offset = 0
for (const ref of references) {
try {
const resolvedValue = await resolveLiquidReference(ref, verbose)
if (resolvedValue !== null) {
const originalText = ref.original
let replacement: string
if (withMarkers) {
const commentStart = `<!-- begin ${ref.type}s.${ref.path} -->`
const commentEnd = `<!-- end ${ref.type}s.${ref.path} -->`
replacement = `${commentStart}${resolvedValue}${commentEnd}`
} else {
replacement = resolvedValue
}
const startPos = ref.startIndex + offset
const endPos = ref.endIndex + offset
expandedContent =
expandedContent.substring(0, startPos) + replacement + expandedContent.substring(endPos)
offset += replacement.length - originalText.length
if (verbose) {
console.log(chalk.green(` Expanded: ${ref.type}s.${ref.path}`))
}
} else {
if (verbose) {
console.log(chalk.yellow(` Warning: Could not expand ${ref.type}s.${ref.path}`))
}
}
} catch (error: unknown) {
if (verbose) {
console.log(
chalk.red(` Error expanding ${ref.type}s.${ref.path}: ${getErrorMessage(error)}`),
)
}
}
}
// expandReferences handles remaining-reference detection in recursive mode.
return expandedContent
}
async function detectContentEdits(
content: string,
verbose?: boolean,
allowedTypes?: Array<'reusable' | 'variable'>,
): Promise<boolean> {
let hasEdits = false
for (const [, type, dataPath, resolvedContent] of content.matchAll(EXPANDED_PATTERN)) {
const refType = type as 'reusable' | 'variable'
const selected = !allowedTypes || allowedTypes.includes(refType)
if (selected) {
try {
const originalContent = loadDataValue(refType, dataPath.trim())
if (originalContent !== null) {
// Nested expanded blocks must become Liquid tags again to match the raw data value.
const currentContent = restoreFileContent(resolvedContent).trim()
if (currentContent !== originalContent.trim()) {
hasEdits = true
if (verbose) {
console.log(chalk.yellow(` Content has been edited: ${type}s.${dataPath}`))
console.log(
chalk.dim(' Original:'),
originalContent.substring(0, 50) + (originalContent.length > 50 ? '...' : ''),
)
console.log(
chalk.dim(' Current: '),
currentContent.substring(0, 50) + (currentContent.length > 50 ? '...' : ''),
)
}
}
}
} catch (error) {
if (verbose) {
console.log(chalk.yellow(` Could not verify content for ${type}s.${dataPath}: ${error}`))
}
}
}
// EXPANDED_PATTERN matches only the outermost block, and a selected block collapses all types.
if (await detectContentEdits(resolvedContent, verbose, selected ? undefined : allowedTypes)) {
hasEdits = true
}
}
return hasEdits
}
function loadDataValue(type: 'reusable' | 'variable', dataPath: string): string | null {
try {
const targetPath = getDataFilePath(type, dataPath)
if (!fs.existsSync(targetPath)) {
return null
}
if (type === 'reusable') {
const content = fs.readFileSync(targetPath, 'utf8')
// Strip reusable frontmatter before comparing content, matching resolveReusable.
const contentWithoutFrontmatter = content.replace(/^---[\s\S]*?---\s*/, '')
return contentWithoutFrontmatter.trim()
} else {
const yamlContent = fs.readFileSync(targetPath, 'utf8')
const data = load(yamlContent) as Record<string, unknown>
const pathParts = dataPath.split('.')
let current: unknown = data
for (let i = 1; i < pathParts.length; i++) {
if (current && typeof current === 'object' && pathParts[i] in current) {
current = (current as Record<string, unknown>)[pathParts[i]]
} else {
return null
}
}
return typeof current === 'string' ? current.trim() : String(current).trim()
}
} catch {
// Unreadable data returns null so callers can treat it as unverifiable.
}
return null
}
function restoreFileContent(
content: string,
verbose?: boolean,
allowedTypes?: Array<'reusable' | 'variable'>,
): string {
return content.replace(EXPANDED_PATTERN, (match, type, dataPath, resolvedContent) => {
const refType = type as 'reusable' | 'variable'
if (!allowedTypes || allowedTypes.includes(refType)) {
const originalLiquid = `{% data ${type}s.${dataPath} %}`
if (verbose) {
console.log(chalk.green(` Restored: ${type}s.${dataPath}`))
}
return originalLiquid
}
// Keep the unselected outer block, but restore selected blocks nested inside it.
const restoredInner = restoreFileContent(resolvedContent, verbose, allowedTypes)
return `<!-- begin ${type}s.${dataPath} -->${restoredInner}<!-- end ${type}s.${dataPath} -->`
})
}
function updateDataFiles(
updates: ReturnType<typeof extractDataUpdates>,
verbose?: boolean,
dryRun?: boolean,
): string[] {
if (updates.length === 0) {
if (verbose) {
console.log(chalk.yellow(' No content changes found'))
}
return []
}
const updatesByFile = new Map<string, string[]>()
for (const update of updates) {
const key = `${update.type}:${update.path}`
if (!updatesByFile.has(key)) {
updatesByFile.set(key, [])
}
updatesByFile.get(key)!.push(update.newContent)
}
const updatedFiles: string[] = []
for (const [key, contents] of updatesByFile) {
const [type, dataPath] = key.split(':')
const targetFilePath = applyDataUpdates(
type as 'reusable' | 'variable',
dataPath,
contents,
verbose,
dryRun,
)
if (targetFilePath) {
updatedFiles.push(targetFilePath)
}
}
return updatedFiles
}
function extractDataUpdates(
content: string,
allowedTypes?: Array<'reusable' | 'variable'>,
): Array<{ type: 'reusable' | 'variable'; path: string; newContent: string }> {
const updates: Array<{ type: 'reusable' | 'variable'; path: string; newContent: string }> = []
for (const [, type, dataPath, resolvedContent] of content.matchAll(EXPANDED_PATTERN)) {
const refType = type as 'reusable' | 'variable'
const selected = !allowedTypes || allowedTypes.includes(refType)
if (selected) {
// Restore nested blocks of every type so data files keep Liquid tags, not markers.
const newContent = restoreFileContent(resolvedContent).trim()
try {
const originalContent = loadDataValue(refType, dataPath.trim())
if (originalContent !== null && newContent !== originalContent.trim()) {
updates.push({ type: refType, path: dataPath.trim(), newContent })
}
} catch {
// Keep blocks on unexpected errors; unreadable files return null from loadDataValue.
updates.push({ type: refType, path: dataPath.trim(), newContent })
}
}
// EXPANDED_PATTERN matches only the outermost block, and a selected block collapses all types.
updates.push(...extractDataUpdates(resolvedContent, selected ? undefined : allowedTypes))
}
return updates
}
function applyDataUpdates(
type: 'reusable' | 'variable',
dataPath: string,
contents: string[],
verbose?: boolean,
dryRun?: boolean,
): string | null {
const targetPath = getDataFilePath(type, dataPath)
if (!fs.existsSync(targetPath)) {
if (verbose) {
console.log(chalk.red(` Error: Data file not found: ${targetPath}`))
}
return null
}
if (dryRun) {
if (verbose) {
console.log(chalk.blue(` Would update: ${targetPath}`))
if (contents.length > 1) {
console.log(
chalk.yellow(
` Warning: Multiple content blocks found for ${dataPath}, would use first one`,
),
)
}
console.log(
chalk.dim(
` New content: ${contents[0].substring(0, 100)}${contents[0].length > 100 ? '...' : ''}`,
),
)
} else {
console.log(chalk.green(` Updated: ${targetPath}`))
}
return targetPath // Dry runs return the target path so callers can report it.
}
try {
if (type === 'reusable') {
if (contents.length > 1) {
console.log(
chalk.yellow(` Warning: Multiple content blocks found for ${dataPath}, using first one`),
)
}
// Preserve a trailing newline from the original reusable file.
const originalContent = fs.readFileSync(targetPath, 'utf8')
const hasTrailingNewline = originalContent.endsWith('\n')
const newContent =
hasTrailingNewline && !contents[0].endsWith('\n') ? `${contents[0]}\n` : contents[0]
fs.writeFileSync(targetPath, newContent)
if (verbose) {
console.log(chalk.green(` Updated: ${type}s.${dataPath}`))
}
} else {
const yamlContent = fs.readFileSync(targetPath, 'utf8')
const data = load(yamlContent) as Record<string, unknown>
const pathParts = dataPath.split('.')
const propertyPath = pathParts.slice(1)
let current: Record<string, unknown> = data
for (let i = 0; i < propertyPath.length - 1; i++) {
if (!current[propertyPath[i]]) {
current[propertyPath[i]] = {}
}
current = current[propertyPath[i]] as Record<string, unknown>
}
const finalKey = propertyPath[propertyPath.length - 1]
if (contents.length > 1) {
console.log(
chalk.yellow(` Warning: Multiple content blocks found for ${dataPath}, using first one`),
)
}
current[finalKey] = contents[0]
// Preserve a trailing newline from the original YAML file.
const hasTrailingNewline = yamlContent.endsWith('\n')
const yamlOutput = dump(data)
const finalYaml =
hasTrailingNewline && !yamlOutput.endsWith('\n') ? `${yamlOutput}\n` : yamlOutput
fs.writeFileSync(targetPath, finalYaml)
if (verbose) {
console.log(chalk.green(` Updated: ${type}s.${dataPath}`))
}
}
return targetPath
} catch (error: unknown) {
if (verbose) {
console.log(chalk.red(` Error updating ${type}s.${dataPath}: ${getErrorMessage(error)}`))
}
return null
}
}
function findLiquidReferences(
content: string,
allowedTypes?: Array<'reusable' | 'variable'>,
): LiquidReference[] {
const references: LiquidReference[] = []
const types = allowedTypes || ['reusable', 'variable']
// Match data references for reusables and variables.
const liquidPattern = /{%\s*data\s+(reusables|variables)\.([^%]+)\s*%}/g
let match
while ((match = liquidPattern.exec(content)) !== null) {
const [original, type, dataPath] = match
const refType = type.slice(0, -1) as 'reusable' | 'variable'
if (types.includes(refType)) {
references.push({
original,
type: refType,
path: dataPath.trim(),
startIndex: match.index,
endIndex: match.index + original.length,
})
}
}
return references
}
async function resolveLiquidReference(
ref: LiquidReference,
verbose?: boolean,
): Promise<string | null> {
try {
if (ref.type === 'reusable') {
return await resolveReusable(ref.path, verbose)
} else if (ref.type === 'variable') {
return await resolveVariable(ref.path, verbose)
}
} catch (error: unknown) {
if (verbose) {
console.log(chalk.red(` Error resolving ${ref.type}: ${getErrorMessage(error)}`))
}
}
return null
}
async function resolveReusable(reusablePath: string, verbose?: boolean): Promise<string | null> {
const filePath = getDataFilePath('reusable', reusablePath)
if (!fs.existsSync(filePath)) {
if (verbose) {
console.log(chalk.yellow(` Reusable not found: ${reusablePath}`))
}
return null
}
try {
const content = fs.readFileSync(filePath, 'utf-8')
// Strip reusable frontmatter before inserting its body.
const contentWithoutFrontmatter = content.replace(/^---[\s\S]*?---\s*/, '')
return contentWithoutFrontmatter.trim()
} catch (error: unknown) {
if (verbose) {
console.log(
chalk.yellow(` Error reading reusable ${reusablePath}: ${getErrorMessage(error)}`),
)
}
return null
}
}
async function resolveVariable(variablePath: string, verbose?: boolean): Promise<string | null> {
const pathParts = variablePath.split('.')
if (pathParts.length < 2) {
if (verbose) {
console.log(chalk.yellow(` Invalid variable path: ${variablePath}`))
}
return null
}
const filePath = getDataFilePath('variable', variablePath)
if (!fs.existsSync(filePath)) {
if (verbose) {
console.log(chalk.yellow(` Variable file not found: ${filePath}`))
}
return null
}
try {
const yamlContent = fs.readFileSync(filePath, 'utf-8')
const data = load(yamlContent) as Record<string, unknown>
// Variable paths start with the file name; remaining segments address YAML keys.
const [, ...keyPath] = pathParts
let value: unknown = data
for (const key of keyPath) {
if (value && typeof value === 'object' && key in value) {
value = (value as Record<string, unknown>)[key]
} else {
if (verbose) {
console.log(chalk.yellow(` Variable key not found: ${variablePath}`))
}
return null
}
}
if (typeof value === 'string') {
return value
} else if (value !== null && value !== undefined) {
return String(value)
} else {
if (verbose) {
console.log(chalk.yellow(` Variable value is null/undefined: ${variablePath}`))
}
return null
}
} catch (error: unknown) {
if (verbose) {
console.log(
chalk.yellow(` Error parsing variable ${variablePath}: ${getErrorMessage(error)}`),
)
}
return null
}
}
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