From bf974e83effd789c83bddfae7e8a35d3e437afa3 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 26 Nov 2014 12:39:55 +0530
Subject: [PATCH] Add a "Change Language" link to the User Manual sidebar

---
 manual/build.py              |  3 +++
 manual/conf.py               | 13 +++++++++++++
 manual/custom.py             | 16 +++++++++++++++-
 manual/templates/layout.html | 17 +++++++++++++++++
 src/calibre/linux.py         |  3 ++-
 5 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/manual/build.py b/manual/build.py
index 7645230858..2007d8d578 100755
--- a/manual/build.py
+++ b/manual/build.py
@@ -77,6 +77,9 @@ if __name__ == '__main__':
     if len(sys.argv) == 1:
         base = j(tempfile.gettempdir(), 'manual')
         os.environ['CALIBRE_OVERRIDE_LANG'] = language = 'en'
+        if 'ALL_USER_MANUAL_LANGUAGES' not in os.environ:
+            import json
+            os.environ['ALL_USER_MANUAL_LANGUAGES'] = ' '.join(json.load(open('locale/completed.json', 'rb')))
         sphinx_build(language, base, t='online', quiet=False)
     else:
         language, base  = sys.argv[1:]
diff --git a/manual/conf.py b/manual/conf.py
index c2f1405f09..fadd4f1607 100644
--- a/manual/conf.py
+++ b/manual/conf.py
@@ -138,6 +138,19 @@ html_title       = title
 html_short_title = 'Start'
 html_logo        = 'resources/logo.png'
 
+from calibre.utils.localization import get_language
+html_context = {}
+html_context['other_languages'] = [
+    (lc, get_language(lc)) for lc in os.environ.get('ALL_USER_MANUAL_LANGUAGES', '').split() if lc != language]
+def sort_languages(x):
+    from calibre.utils.icu import sort_key
+    lc, name = x
+    if lc == language:
+        return ''
+    return sort_key(unicode(name))
+html_context['other_languages'].sort(key=sort_languages)
+del sort_languages, get_language
+
 epub_author      = 'Kovid Goyal'
 epub_publisher   = 'Kovid Goyal'
 epub_identifier  = 'http://manual.calibre-ebook.com'
diff --git a/manual/custom.py b/manual/custom.py
index b7e539e3b5..dcd979a5d7 100644
--- a/manual/custom.py
+++ b/manual/custom.py
@@ -4,6 +4,7 @@
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 import sys, os, re, textwrap
+from functools import partial
 import init_calibre
 del init_calibre
 
@@ -219,7 +220,7 @@ def cli_docs(app):
     documented = [' '*4 + c[0] for c in documented_cmds]
     undocumented = ['  * ' + c for c in undocumented_cmds]
 
-    raw = (CLI_INDEX % cli_index_strings()).format(documented='\n'.join(documented),
+    raw = (CLI_INDEX % cli_index_strings()[:5]).format(documented='\n'.join(documented),
             undocumented='\n'.join(undocumented))
     if not os.path.exists('cli'):
         os.makedirs('cli')
@@ -254,12 +255,25 @@ def template_docs(app):
     raw = generate_template_language_help(app.config.language)
     update_cli_doc('template_ref', raw, app)
 
+def localized_path(app, langcode, pagename):
+    href = app.builder.get_target_uri(pagename)
+    href = re.sub(r'generated/[a-z]+/', 'generated/%s/' % langcode, href)
+    prefix = '/'
+    if langcode != 'en':
+        prefix += langcode + '/'
+    return prefix + href
+
+def add_html_context(app, pagename, templatename, context, *args):
+    context['localized_path'] = partial(localized_path, app)
+    context['change_language_text'] = cli_index_strings()[5]
+
 def setup(app):
     app.add_builder(EPUBHelpBuilder)
     app.add_builder(LaTeXHelpBuilder)
     app.connect('source-read', source_read_handler)
     app.connect('doctree-read', substitute)
     app.connect('builder-inited', generate_docs)
+    app.connect('html-page-context', add_html_context)
     app.connect('build-finished', finished)
 
 def finished(app, exception):
diff --git a/manual/templates/layout.html b/manual/templates/layout.html
index afd9728a6d..534cb302dd 100644
--- a/manual/templates/layout.html
+++ b/manual/templates/layout.html
@@ -6,7 +6,15 @@
         .float-right-img { float: right; margin-left: 1em; margin-bottom: 1em }
         .half-with-img { max-width: 50% }
         .fit-img { max-width: 95% }
+        #languages-menu { display: none }
     </style>
+    <script type="text/javascript">
+    function toggle_languages_menu() {
+        var m = document.getElementById('languages-menu');
+        if (m.style.display === "block") m.style.display = "none";
+        else m.style.display = "block";
+    }
+    </script>
 
 {% endblock %}
 
@@ -65,6 +73,15 @@
             <img alt="" border="0" src="https://www.paypalobjects.com/en_GB/i/scr/pixel.gif" width="1" height="1" />
         </form>
         <hr/>
+        {%- if not embedded %}
+        <div><a href="#" onclick="toggle_languages_menu(); return false;">{{ change_language_text }}</a></div>
+        <ul id="languages-menu">
+        {%- for lang in other_languages %}
+        <li><a href="{{ localized_path(lang[0], pagename) }}">{{ lang[1] }}</a></li>
+        {%- endfor %}
+        </ul>
+        <hr/>
+        {%- endif %}
 {% endblock %}
 
 
diff --git a/src/calibre/linux.py b/src/calibre/linux.py
index a40ad923f9..cfb967b354 100644
--- a/src/calibre/linux.py
+++ b/src/calibre/linux.py
@@ -1106,7 +1106,8 @@ def cli_index_strings():
     ' if you installed calibre in :file:`/Applications` the command line tools'
     ' are in :file:`/Applications/calibre.app/Contents/console.app/Contents/MacOS/`.'), _(
         'Documented Commands'), _('Undocumented Commands'), _(
-        'You can see usage for undocumented commands by executing them without arguments in a terminal.')
+        'You can see usage for undocumented commands by executing them without arguments in a terminal.'), _(
+            'Change Language')
 
 
 if __name__ == '__main__':