Switch to a simple gettext l10n system

.github/workflows/l10n.yml

@@ -0,0 +1,19 @@
+name: L10n
+on: pull_request
+
+jobs:
+  l10n-extract-check:
+    runs-on: ubuntu-latest
+    name: Pot check
+    steps:
+    - uses: actions/checkout@master
+    - name: Set up Node
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+    - name: npm install
+      run: npm ci
+    - name: extract l10n files
+      run: npm run l10n:extract
+    - name: Check l10n file changes
+      run: bash -c "[[ ! \"`git status --porcelain l10n`\" ]] || ( echo 'Uncommited l10n changes. Run `npm l10n:extract`.' && git status && exit 1 )"

build/extract-l10n.js

@@ -4,22 +4,15 @@ let extractor = new GettextExtractor();
 
 extractor
     .createJsParser([
-        JsExtractors.callExpression('t', {
+        JsExtractors.callExpression('gt.gettext', {
             arguments: {
                 text: 0,
                 context: 1
             }
         }),
-        JsExtractors.callExpression('n', {
-            arguments: {
-                text: 1,
-                textPlural: 2,
-                context: 3
-            }
-        })
     ])
     .parseFilesGlob('./lib/**/*.@(ts|js)');
 
-extractor.savePotFile('./messages.pot');
+extractor.savePotFile('./l10n/messages.pot');
 
 extractor.printStats();

l10n/messages.pot

@@ -0,0 +1,7 @@
+msgid ""
+msgstr ""
+"Content-Type: text/plain; charset=UTF-8\n"
+
+#: lib/index.ts:22
+msgid "seconds"
+msgstr ""

lib/constants.d.ts

@@ -0,0 +1,6 @@
+interface Translations {
+    locale: string
+    json: object
+}
+
+declare const LOCALES: Translations[];

lib/index.ts

@@ -1,11 +1,15 @@
 import moment from 'moment'
-import { getLocale, translate } from '@nextcloud/l10n'
+import Gettext from 'node-gettext'
+import { getLocale } from '@nextcloud/l10n'
 
-function t(text: string): string {
-    return translate('nextcloud-moment', text)
-}
+const gt = new Gettext()
 
-moment.locale(getLocale())
+const locale = getLocale()
+LOCALES.map(data => {
+    gt.addTranslations(data.locale, 'messages', data.json)
+})
+gt.setLocale(locale)
+moment.locale(locale)
 
 moment.updateLocale(
     moment.locale(),
@@ -15,7 +19,7 @@ moment.updateLocale(
             // @ts-ignore
             moment.localeData(moment.locale())._relativeTime,
             {
-                s: t('seconds'),
+                s: gt.gettext('seconds'),
             }
         )
     })