i18n: update list of translations from Transifex

- Add automatic tooling to retrieve translation stats and
   output new CMake variable settings.
 - If there are i18n language selection warnings, stop CMake.

CMakeLists.txt

@@ -103,12 +103,12 @@ set( CALAMARES_VERSION_RC 1 )
 #       checks for new languages and misspelled ones are done (that is,
 #       copy these four lines to four backup lines, add "p", and then update
 #       the original four lines with the current translations).
-set( _tx_complete ca zh_TW hr cs_CZ da et fr id it_IT lt pl pt_PT es_MX tr_TR )
-set( _tx_good sq de pt_BR zh_CN ja ro es sk )
-set( _tx_ok hu ru he nl bg uk ast is ko ar sv el gl en_GB
-            th fi_FI hi eu nb sr sl sr@latin mr es_PR kn kk be )
-set( _tx_bad fr_CH gu lo fa ur uz eo )
-
+set( _tx_complete zh_TW tr_TR sk pt_PT pt_BR pl lt ja id hr gl fr
+    et de da cs_CZ ca )
+set( _tx_good es sq es_MX zh_CN it_IT he en_GB ru ro hi bg hu )
+set( _tx_ok uk nl ast ko is ar sv el th fi_FI eu sr nb sl
+    sr@latin mr es_PR )
+set( _tx_bad eo kk kn uz ur mk lo gu fr_CH fa be )
 
 ### Required versions
 #
@@ -316,12 +316,14 @@ endif()
 #
 set( prev_tx ${p_tx_complete} ${p_tx_good} ${p_tx_ok} ${p_tx_bad} )
 set( curr_tx ${_tx_complete} ${_tx_good} ${_tx_ok} ${_tx_bad} )
+set( tx_errors OFF )
 if ( prev_tx )
     # Gone in new list
     foreach( l ${prev_tx} )
         list( FIND curr_tx ${l} p_l )
         if( p_l EQUAL -1 )
             message(WARNING "Language ${l} was present in previous translations and is now absent.")
+            set( tx_errors ON )
         endif()
     endforeach()
 
@@ -330,10 +332,12 @@ if ( prev_tx )
         list( FIND prev_tx ${l} p_l )
         if( p_l EQUAL -1 )
             message(WARNING "Language ${l} is new.")
+            set( tx_errors ON )
         endif()
         set( p_l "lang/calamares_${l}.ts" )
         if( NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${p_l} )
             message(WARNING "Language ${l} has no .ts file yet.")
+            set( tx_errors ON )
         endif()
     endforeach()
 
@@ -342,6 +346,9 @@ if ( prev_tx )
 endif()
 unset( prev_tx )
 unset( curr_tx )
+if( tx_errors )
+    message( FATAL_ERROR "Translation warnings, see above." )
+endif()
 
 set( CALAMARES_TRANSLATION_LANGUAGES en ${_tx_complete} ${_tx_good} ${_tx_ok} )
 list( SORT CALAMARES_TRANSLATION_LANGUAGES )

ci/txstats.py

@@ -0,0 +1,87 @@
+#! /usr/bin/env python
+#
+# Uses the Transifex API to get a list of enabled languages,
+# and outputs CMake settings for inclusion into CMakeLists.txt.
+import sys
+
+def get_tx_credentials():
+    """
+    Gets the API token out of the user's .transifexrc (this is supposed
+    to be secure).
+    """
+    import configparser
+    import os
+    txconfig_name = os.path.expanduser("~/.transifexrc")
+    try:
+        with open(txconfig_name, "r") as f:
+            parser = configparser.SafeConfigParser()
+            parser.readfp(f)
+
+            return parser.get("https://www.transifex.com", "password")
+    except IOError as e:
+        return None
+
+def output_langs(all_langs, label, filterfunc):
+    """
+    Output (via print) all of the languages in @p all_langs
+    that satisfy the translation-percentage filter @p filterfunc.
+    Prints a CMake set() command with the @p label as part
+    of the variable name.
+
+    Performs line-wrapping.
+    """
+    these_langs = [l for s, l in all_langs if filterfunc(s)]
+    out = " ".join(["set( _tx_%s" % label, " ".join(these_langs), ")"])
+    width = 68
+    prefix = ""
+
+    while len(out) > width - len(prefix):
+        chunk = out[:out[:width].rfind(" ")]
+        print("%s%s" % (prefix, chunk))
+        out = out[len(chunk)+1:]
+        prefix = "    "
+    print("%s%s" % (prefix, out))
+
+def get_tx_stats(token):
+    """
+    Does an API request to Transifex with the given API @p token, getting
+    the translation statistics for the main body of texts. Then prints
+    out CMake settings to replace the _tx_* variables in CMakeLists.txt
+    according to standard criteria.
+    """
+    import requests
+
+    r = requests.get("https://api.transifex.com/organizations/calamares/projects/calamares/resources/calamares-master/", auth=("api", token))
+    if r.status_code != 200:
+        return 1
+
+    all_langs = []
+
+    j = r.json()
+    languages = j["stats"]
+    print("# Total %d languages" % len(languages))
+    for lang_name in languages:
+        stats = languages[lang_name]["translated"]["percentage"]
+        all_langs.append((stats, lang_name))
+
+    all_langs.sort(reverse=True)
+
+    output_langs(all_langs, "complete", lambda s : s == 1.0)
+    output_langs(all_langs, "good", lambda s : 1.0 > s >= 0.75)
+    output_langs(all_langs, "ok", lambda s : 0.75 > s >= 0.05)
+    output_langs(all_langs, "bad", lambda s : 0.05 > s)
+
+    return 0
+
+
+def main():
+    cred = get_tx_credentials()
+    if cred:
+        return get_tx_stats(cred)
+    else:
+        print("! Could not find API token in ~/.transifexrc")
+        return 1
+    return 0
+
+if __name__ == "__main__":
+    sys.exit(main())