[enh] specify search engine in queries

searx/webapp.py

     path.append(realpath(dirname(realpath(__file__))+'/../'))
 
 from flask import Flask, request, render_template, url_for, Response, make_response
-from searx.engines import search, categories, get_engines_stats
+from searx.engines import search, categories, engines, get_engines_stats
 from searx import settings
 import json
 
             kwargs['selected_categories'] = ['general']
     return render_template(template_name, **kwargs)
 
+def parse_query(query):
+    query_engines = []
+    query_parts = query.split()
+    if query_parts[0].startswith('-') and query_parts[0][1:] in engines:
+        query_engines.append({'category': 'TODO', 'name': query_parts[0][1:]})
+        query = query.replace(query_parts[0], '', 1).strip()
+    return query, query_engines
+
 @app.route('/', methods=['GET', 'POST'])
 def index():
     global categories
     if not request_data.get('q'):
         return render('index.html')
 
-    query = request_data['q'].encode('utf-8')
-
     selected_categories = []
-    for pd_name,pd in request_data.items():
-        if pd_name.startswith('category_'):
-            category = pd_name[9:]
-            if not category in categories:
-                continue
-            selected_categories.append(category)
-    if not len(selected_categories):
-        cookie_categories = request.cookies.get('categories', '').split(',')
-        for ccateg in cookie_categories:
-            if ccateg in categories:
-                selected_categories.append(ccateg)
-    if not len(selected_categories):
-        selected_categories = ['general']
 
-    selected_engines = []
-    for categ in selected_categories:
-        selected_engines.extend({'category': categ, 'name': x.name} for x in categories[categ])
+    query, selected_engines = parse_query(request_data['q'].encode('utf-8'))
+
+    if not len(selected_engines):
+        for pd_name,pd in request_data.items():
+            if pd_name.startswith('category_'):
+                category = pd_name[9:]
+                if not category in categories:
+                    continue
+                selected_categories.append(category)
+        if not len(selected_categories):
+            cookie_categories = request.cookies.get('categories', '').split(',')
+            for ccateg in cookie_categories:
+                if ccateg in categories:
+                    selected_categories.append(ccateg)
+        if not len(selected_categories):
+            selected_categories = ['general']
+
+        for categ in selected_categories:
+            selected_engines.extend({'category': categ, 'name': x.name} for x in categories[categ])
 
     results = search(query, request, selected_engines)
     for result in results:
         return Response(json.dumps({'query': query, 'results': results}), mimetype='application/json')
     template = render('results.html'
                         ,results=results
-                        ,q=query.decode('utf-8')
+                        ,q=request_data['q']
                         ,selected_categories=selected_categories
                         ,number_of_results=len(results)
                         )