Make client work without internet

tldr.py

@@ -75,8 +75,8 @@ def load_page_from_cache(command, platform, language):
         with open(get_cache_file_path(
             command,
             platform,
-            language), 'rb'
-        ) as cache_file:
+            language
+        ), 'rb') as cache_file:
             cache_file_contents = cache_file.read()
         return cache_file_contents
     except Exception:
@@ -176,6 +176,7 @@ def get_language_list():
 
 
 def get_page(command, remote=None, platforms=None, languages=None):
+    returnErr = {}
     if platforms is None:
         platforms = get_platform_list()
     if languages is None:
@@ -185,15 +186,23 @@ def get_page(command, remote=None, platforms=None, languages=None):
             if platform is None:
                 continue
             try:
-                return get_page_for_platform(command, platform, remote, language)
+                return {
+                    "entry": get_page_for_platform(
+                        command,
+                        platform,
+                        remote,
+                        language
+                    ),
+                    "error": False
+                }
             except HTTPError as err:
                 if err.code != 404:
-                    raise
-            except URLError:
+                    returnErr = {"entry": err, "error": True}
+            except URLError as err:
                 if not PAGES_SOURCE_LOCATION.startswith('file://'):
-                    raise
+                    returnErr = {"entry": err, "error": True}
 
-    return False
+    return returnErr
 
 
 DEFAULT_COLORS = {
@@ -269,7 +278,7 @@ def output(page):
                     colored(
                         line.replace('>', '').replace('<', ''),
                         *colors_of('description')
-                    )
+                )
                 sys.stdout.buffer.write(line.encode('utf-8'))
             elif line[0] == '-':
                 line = '\n' + ' ' * LEADING_SPACES_NUM + \
@@ -405,24 +414,23 @@ def main():
                 with open(command, encoding='utf-8') as open_file:
                     output(open_file.read().encode('utf-8').splitlines())
     else:
-        try:
-            command = '-'.join(options.command)
-            result = get_page(
-                command,
-                options.source,
-                options.platform,
-                options.language
-            )
-            if not result:
-                sys.exit((
-                    "`{cmd}` documentation is not available. "
-                    "Consider contributing Pull Request to "
-                    "https://github.com/tldr-pages/tldr"
-                ).format(cmd=command))
-            else:
-                output(result)
-        except URLError as e:
-            sys.exit("Error fetching from tldr: {}".format(e))
+        command = '-'.join(options.command)
+        result = get_page(
+            command,
+            options.source,
+            options.platform,
+            options.language
+        )
+        if result.get('error'):
+            sys.exit("Error fetching from tldr: {}".format(result['entry']))
+        elif result.get("entry"):
+            output(result['entry'])
+        else:
+            sys.exit((
+                "`{cmd}` documentation is not available. "
+                "Consider contributing Pull Request to "
+                "https://github.com/tldr-pages/tldr"
+            ).format(cmd=command))
 
 
 def cli():