Add config file support

.gitignore

@@ -6,3 +6,4 @@ extension/Reader-View-Chrome-Web-Store.zip
 /output
 config/reader-view-preferences.json
 config/rules.css
+.pdfyrc

.pdfyrc.example

@@ -0,0 +1,4 @@
+{
+  "theme": "light",
+  "css": "config/rules.css"
+}

README.md

@@ -35,18 +35,50 @@ Arguments:
 Options:
   -t, --theme <theme>      Reader View theme (light, dark, sepia, groove-dark, solarized-light, solarized-dark, nord-light, nord-dark)
   -c, --css <path>         path to custom CSS file
+  --config <path>          path to config file (.pdfyrc, .pdfyrc.json, pdfy.config.js)
   -p, --prefs <path>       path to extension preferences JSON
   -o, --output <path>      output file path (default: ./output/<title>.pdf)
   -l, --log-level <level>  logging level (fatal, error, warn, info, debug)
   -h, --help               display help for command
 ```
 
+### Configuration
+
+pdfy automatically discovers a config file in the current directory. Supported formats:
+
+- `.pdfyrc` (JSON)
+- `.pdfyrc.json` (JSON)
+- `pdfy.config.js` (ESM module exporting a default object)
+
+Example `.pdfyrc`:
+```json
+{
+  "theme": "dark",
+  "css": "config/rules.css",
+  "prefs": "config/reader-view-preferences.json",
+  "output": "./output/article.pdf"
+}
+```
+
+Example `pdfy.config.js`:
+```js
+export default {
+  theme: 'dark',
+  css: 'config/rules.css',
+  prefs: 'config/reader-view-preferences.json',
+  output: './output/article.pdf'
+}
+```
+
+CLI flags always override config file values. Use `--config <path>` to specify a custom config file location.
+
 ### Examples
 
 ```bash
 node src/index.js https://example.com/article
 node src/index.js https://example.com/article --theme dark --css config/rules.css
 node src/index.js https://example.com/article --prefs config/reader-view-preferences.json
+node src/index.js https://example.com/article --config .pdfyrc
 npm start -- https://example.com/article --theme dark --css config/rules.css
 ```
 

src/cli.js

@@ -22,6 +22,7 @@ program
     `Reader View theme (${VALID_THEMES.join(', ')})`
   )
   .option('-c, --css <path>', 'path to custom CSS file')
+  .option('--config <path>', 'path to config file (.pdfyrc, .pdfyrc.json, pdfy.config.js)')
   .option('-p, --prefs <path>', 'path to extension preferences JSON')
   .option(
     '-o, --output <path>',
@@ -50,7 +51,8 @@ export function parseArgs () {
       theme: opts.theme || null,
       css: opts.css || null,
       prefs: opts.prefs || null,
-      output: opts.output || null
+      output: opts.output || null,
+      config: opts.config || null
     }
   }
 }

src/config.js

@@ -1,7 +1,54 @@
 import fs from 'node:fs'
 import path from 'node:path'
+import { pathToFileURL } from 'node:url'
 import logger from './logger.js'
 
+const CONFIG_FILE_NAMES = ['.pdfyrc', '.pdfyrc.json', 'pdfy.config.js']
+
+function normalizeConfig (config) {
+  const result = {}
+  if (config.theme) result.theme = config.theme
+  if (config.css) result.css = config.css
+  if (config.prefs) result.prefs = config.prefs
+  if (config.output) result.output = config.output
+  if (config['log-level']) result.logLevel = config['log-level']
+  if (config.logLevel) result.logLevel = config.logLevel
+  return result
+}
+
+function findConfigFile () {
+  for (const name of CONFIG_FILE_NAMES) {
+    const fullPath = path.resolve(name)
+    if (fs.existsSync(fullPath)) return fullPath
+  }
+  return null
+}
+
+async function parseConfigFile (filePath) {
+  if (filePath.endsWith('.js')) {
+    const mod = await import(pathToFileURL(filePath).href)
+    return normalizeConfig(mod.default || {})
+  }
+  const raw = fs.readFileSync(filePath, 'utf-8')
+  return normalizeConfig(JSON.parse(raw))
+}
+
+export async function loadConfigFile (configPath) {
+  const target = configPath
+    ? path.resolve(configPath)
+    : findConfigFile()
+
+  if (!target || !fs.existsSync(target)) return {}
+
+  logger.debug(`Config loaded from: "${target}"`)
+  try {
+    return await parseConfigFile(target)
+  } catch (err) {
+    logger.warn(`Could not parse config file "${target}": ${err.message}`)
+    return {}
+  }
+}
+
 export function loadPreferences (prefsPath) {
   if (!prefsPath || !fs.existsSync(prefsPath)) return {}
   try {

src/index.js

@@ -3,7 +3,7 @@ import process from 'node:process'
 import path from 'node:path'
 import readline from 'node:readline/promises'
 import { parseArgs, VALID_THEMES } from './cli.js'
-import { loadPreferences, readCustomCss } from './config.js'
+import { loadConfigFile, loadPreferences, readCustomCss } from './config.js'
 import logger from './logger.js'
 import {
   checkExtension,
@@ -43,12 +43,18 @@ async function main () {
 
   await checkExtension()
 
+  const config = await loadConfigFile(opts.config)
+
+  const prefsPath = opts.prefs || config.prefs || null
+  const cssPath = opts.css || config.css || null
+  const outputPath = opts.output || config.output || null
+
   let preferences = {}
-  if (opts.prefs) {
-    preferences = loadPreferences(path.resolve(opts.prefs))
+  if (prefsPath) {
+    preferences = loadPreferences(path.resolve(prefsPath))
   }
 
-  const theme = opts.theme || preferences.mode || 'light'
+  const theme = opts.theme || config.theme || preferences.mode || 'light'
   if (!VALID_THEMES.includes(theme)) {
     logger.error(
       `Invalid theme "${theme}". Valid themes: ${VALID_THEMES.join(', ')}`
@@ -59,11 +65,11 @@ async function main () {
   logger.info(`Theme: ${theme}`)
 
   let customCss = null
-  if (opts.css) {
-    customCss = readCustomCss(path.resolve(opts.css))
+  if (cssPath) {
+    customCss = readCustomCss(path.resolve(cssPath))
     if (customCss !== null) {
       preferences['user-css'] = customCss
-      logger.info(`Custom CSS loaded: "${path.resolve(opts.css)}"`)
+      logger.info(`Custom CSS loaded: "${path.resolve(cssPath)}"`)
     }
   }
 
@@ -124,8 +130,8 @@ async function main () {
     await new Promise((resolve) => setTimeout(resolve, 1000))
 
     const title = await getArticleTitle(readerPage)
-    const outputFile = opts.output
-      ? resolveOutputPath(opts.output)
+    const outputFile = outputPath
+      ? resolveOutputPath(outputPath)
       : getOutputFilename(title)
 
     let contentHtml = await extractRenderedContent(readerPage)