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native_background.ts: implement writePref()

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glacambre 2018-05-17 08:23:25 +02:00 • committed by Oliver Blanthorn
parent b8b1470c86
commit 771888599e
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1 changed files with 46 additions and 23 deletions
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69
src/native_background.ts
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@ -326,6 +326,29 @@ export async function getProfileDir() {
}
}
export async function parsePrefs(prefFileContent: string) {
// This RegExp currently only deals with " but for correctness it should
// also deal with ' and `
// We could also just give up on parsing and eval() the whole thing
const regex = new RegExp(
/^(user_|sticky_|lock)?[pP]ref\("([^"]+)",\s*"?([^\)]+?)"?\);$/,
)
// Fragile parsing
let allPrefs = prefFileContent.split("\n").reduce((prefs, line) => {
let matches = line.match(regex)
if (!matches) {
return prefs
}
const key = matches[2]
let value = matches[3]
// value = " means that it should be an empty string
if (value == '"') value = ""
prefs[key] = value
return prefs
}, {})
return allPrefs
}
/** When given the name of a firefox preference file, will load said file and
* return a promise for an object the keys of which correspond to preference
* names and the values of which correspond to preference values.
@ -334,27 +357,8 @@ export async function getProfileDir() {
*/
export async function loadPrefs(filename): Promise<{ [key: string]: string }> {
const result = await read(filename)
if (result.code == 2) return {}
// This RegExp currently only deals with " but for correctness it should
// also deal with ' and `
// We could also just give up on parsing and eval() the whole thing
const regex = new RegExp(
/^(user_|sticky_|lock)?[pP]ref\("([^"]+)",\s*"?([^\)]+?)"\);$/,
)
// Fragile parsing
let allPrefs = result.content.split("\n").reduce((prefs, line) => {
let matches = line.match(regex)
if (!matches) {
return prefs
}
const key = matches[2]
let value = matches[3]
// value = "" means that it should be an empty string
if (value == '"') value = ""
prefs[key] = value
return prefs
}, {})
return allPrefs
if (result.code != 0) return {}
return parsePrefs(result.content)
}
/** Returns a promise for an object that should contain every about:config
@ -366,7 +370,6 @@ export async function getPrefs(): Promise<{ [key: string]: string }> {
const profile = (await getProfileDir()) + "/"
const prefFiles = [
// Debian has these
"/etc/firefox/firefox.js",
"/usr/share/firefox/browser/defaults/preferences/firefox.js",
"/usr/share/firefox/browser/defaults/preferences/debugger.js",
"/usr/share/firefox/browser/defaults/preferences/devtools-startup-prefs.js",
@ -374,6 +377,7 @@ export async function getPrefs(): Promise<{ [key: string]: string }> {
"/usr/share/firefox/browser/defaults/preferences/firefox-branding.js",
"/usr/share/firefox/browser/defaults/preferences/vendor.js",
"/usr/share/firefox/browser/defaults/preferences/firefox.js",
"/etc/firefox/firefox.js",
// Pref files can be found here:
// https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences
profile + "grepref.js",
@ -387,7 +391,6 @@ export async function getPrefs(): Promise<{ [key: string]: string }> {
profile + "user.js",
]
let promises = []
let prers = {}
// Starting all promises before awaiting because we want the calls to be
// made in parallel
for (let file of prefFiles) {
@ -400,3 +403,23 @@ export async function getPrefs(): Promise<{ [key: string]: string }> {
export async function getPref(name: string): Promise<string> {
return (await getPrefs())[name]
}
/** Writes a preference to user.js */
export async function writePref(name: string, value: any) {
if (typeof value == "string") value = `"${value}"`
const file = (await getProfileDir()) + "/user.js"
// No need to check the return code because read returns "" when failing to
// read a file
const text = (await read(file)).content
let prefPos = text.indexOf(`pref("${name}",`)
if (prefPos < 0) {
write(file, `${text}\nuser_pref("${name}", ${value});\n`)
} else {
let substr = text.substring(prefPos)
let prefEnd = substr.indexOf(";\n")
console.log(text, substr, prefPos, prefEnd)
substr = text.substring(prefPos, prefPos + prefEnd)
console.log(substr)
write(file, text.replace(substr, `pref("${name}", ${value})`))
}
}