From 3f8ebf70b193f4391a01d7412324a10e4faa56a2 Mon Sep 17 00:00:00 2001
From: Alexandre Flament <alex@al-f.net>
Date: Thu, 17 Dec 2020 09:57:57 +0100
Subject: [PATCH] [fix] pylint: use "raise ... from ..."

---
 searx/engines/elasticsearch.py | 12 ++++++------
 searx/settings_loader.py       |  4 ++--
 searx/utils.py                 |  4 ++--
 searx/webadapter.py            |  4 ++--
 4 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/searx/engines/elasticsearch.py b/searx/engines/elasticsearch.py
index 081736c1c..0e2d35756 100644
--- a/searx/engines/elasticsearch.py
+++ b/searx/engines/elasticsearch.py
@@ -46,8 +46,8 @@ def _match_query(query):
 
     try:
         key, value = query.split(':')
-    except:
-        raise ValueError('query format must be "key:value"')
+    except Exception as e:
+        raise ValueError('query format must be "key:value"') from e
 
     return {"query": {"match": {key: {'query': value}}}}
 
@@ -71,8 +71,8 @@ def _term_query(query):
 
     try:
         key, value = query.split(':')
-    except:
-        raise ValueError('query format must be key:value')
+    except Exception as e:
+        raise ValueError('query format must be key:value') from e
 
     return {'query': {'term': {key: value}}}
 
@@ -86,8 +86,8 @@ def _terms_query(query):
 
     try:
         key, values = query.split(':')
-    except:
-        raise ValueError('query format must be key:value1,value2')
+    except Exception as e:
+        raise ValueError('query format must be key:value1,value2') from e
 
     return {'query': {'terms': {key: values.split(',')}}}
 
diff --git a/searx/settings_loader.py b/searx/settings_loader.py
index 5dbeb4a9a..e7126aa89 100644
--- a/searx/settings_loader.py
+++ b/searx/settings_loader.py
@@ -24,9 +24,9 @@ def load_yaml(file_name):
         with open(file_name, 'r', encoding='utf-8') as settings_yaml:
             return yaml.safe_load(settings_yaml)
     except IOError as e:
-        raise SearxSettingsException(e, file_name)
+        raise SearxSettingsException(e, file_name) from e
     except yaml.YAMLError as e:
-        raise SearxSettingsException(e, file_name)
+        raise SearxSettingsException(e, file_name) from e
 
 
 def get_default_settings_path():
diff --git a/searx/utils.py b/searx/utils.py
index 057e9d004..3172ad8f3 100644
--- a/searx/utils.py
+++ b/searx/utils.py
@@ -522,7 +522,7 @@ def get_xpath(xpath_spec):
             try:
                 result = XPath(xpath_spec)
             except XPathSyntaxError as e:
-                raise SearxXPathSyntaxException(xpath_spec, str(e.msg))
+                raise SearxXPathSyntaxException(xpath_spec, str(e.msg)) from e
             xpath_cache[xpath_spec] = result
         return result
 
@@ -553,7 +553,7 @@ def eval_xpath(element, xpath_spec):
         return xpath(element)
     except XPathError as e:
         arg = ' '.join([str(i) for i in e.args])
-        raise SearxEngineXPathException(xpath_spec, arg)
+        raise SearxEngineXPathException(xpath_spec, arg) from e
 
 
 def eval_xpath_list(element, xpath_spec, min_len=None):
diff --git a/searx/webadapter.py b/searx/webadapter.py
index 0ad82c62c..ca2604c3e 100644
--- a/searx/webadapter.py
+++ b/searx/webadapter.py
@@ -105,8 +105,8 @@ def parse_timeout(form: Dict[str, str], raw_text_query: RawTextQuery) -> Optiona
         return None
     try:
         return float(timeout_limit)
-    except ValueError:
-        raise SearxParameterException('timeout_limit', timeout_limit)
+    except ValueError as e:
+        raise SearxParameterException('timeout_limit', timeout_limit) from e
 
 
 def parse_category_form(query_categories: List[str], name: str, value: str) -> None: