Added support for all webperf.se categories as -i sources

use for example:
python default.py -i help.webprf
to see all available categories.

engines/webperf.py

@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import json
 import re
 from engines.utils import use_item
 from tests.utils import get_http_content
@@ -24,22 +25,63 @@ def read_sites(input_url, input_skip, input_take):
     list: The list of sites read from the specified category on https://webperf.se.
     """
     sites = []
-
-    if 'offentlig-sektor' in input_url:
-        input_url = 'https://webperf.se/category/ovrig-offentlig-sektor/'
-    elif 'kommuner' in input_url:
-        input_url = 'https://webperf.se/category/kommuner/'
-    elif 'regioner' in input_url:
-        input_url = 'https://webperf.se/category/regioner/'
-    elif 'toplist' in input_url:
-        input_url = 'https://webperf.se/toplist/'
-    elif 'digitalt' in input_url:
-        input_url = 'https://webperf.se/category/digitalt-sverige/'
-    elif 'webbyraer' in input_url:
-        input_url = 'https://webperf.se/category/webbyraer/'
+    all_categories_url = 'https://webperf.se/sites/'
+    categories_fallback = {
+        'offentlig-sektor': '/category/ovrig-offentlig-sektor/',
+        'kommuner': '/category/kommuner/',
+        'regioner': '/category/regioner/',
+        'toplist': '/toplist/',
+        'digitalt': '/category/digitalt-sverige/',
+        'webbyraer': '/category/webbyraer/'
+    }
+
+    all_categories_content = get_http_content(all_categories_url)
+    if all_categories_content != '':
+        categories = {}
+        categories_regex = r"<th scope=\"col\">Kategori<\/th>.*?<tbody>(?P<categories>.*?)<\/tbody>"
+        categories_matches = re.finditer(
+            categories_regex, all_categories_content, re.MULTILINE | re.S)
+        for _, match in enumerate(categories_matches, start=1):
+            all_categories_subcontent = match.group('categories')
+            # <a href=\"(?P<url>\/category\/(?P<name>[^\"]+)/)\">
+            category_regex = r"<a href=\"(?P<url>\/category\/(?P<name>[^\"]+)/)\">"
+            category_matches = re.finditer(
+                category_regex, all_categories_subcontent, re.MULTILINE | re.S)
+            for _, match in enumerate(category_matches, start=1):
+                category_url = match.group('url')
+                category_name = match.group('name')
+                categories[category_name] = category_url
+    else:
+        categories = categories_fallback
+
+    found = False
+    for category_name, category_url in categories.items():
+        if category_name in input_url:
+            input_url = category_url
+            found = True
+
+    if not found:
+        for category_name, category_url in categories_fallback.items():
+            if category_name in input_url:
+                input_url = category_url
+                found = True
+
+    if found:
+        input_url = f'https://webperf.se{input_url}'
     else:
-        raise NotImplementedError('input is incorrect')
+        print('Error: No valid webperf option')
+        print('')
+        print('Available webperf.se input values:')
+        for category_name, category_url in categories.items():
+            print(f'-i {category_name}.webprf')
+        return sites
+
+    sites.extend(get_category_sites(input_url, input_skip, input_take))
+    return sites
 
+def get_category_sites(input_url, input_skip, input_take):
+    print(f'Retrieving sites from {input_url}')
+    sites = []
     category_content = get_http_content(input_url)
 
     category_regex = r"<a href=\"(?P<detail_url>\/site\/[^\"]+)\""