lint: Enforce no lines longer than 120 characters in help docs.

This requires some somewhat messy changes to the all-streams macro.

templates/zerver/help/change-your-language.md

@@ -27,8 +27,12 @@ translation support. Select your desired language from the window.
 displayed in the language of your choice after you reload the page.
 
 !!! tip ""
-    You can help translate parts of Zulip by signing up for an account at **[Transifex](https://www.transifex.com/zulip/zulip/)**.
+    You can help translate parts of Zulip by signing up for an account
+    at **[Transifex](https://www.transifex.com/zulip/zulip/)**.
 
 !!! tip ""
+
     If your entire organization speaks a language other than English, an administrator can
-    [set the default language for new users joining the organization](change-the-default-language-for-your-organization).
+    [set the default language for new users joining the organization][change-org-lang]
+
+[change-org-lang]: change-the-default-language-for-your-organization

templates/zerver/help/include/all-streams.md

@@ -1 +1,2 @@
-If you wish to see streams that you aren't subscribed to, click on the **All Streams** tab; the tab will turn gray upon doing so.
+    If you wish to see streams that you aren't subscribed to, click on the
+        **All Streams** tab; the tab will turn gray upon doing so.

templates/zerver/help/mute-a-topic.md

@@ -34,7 +34,8 @@ wish to mute in the **Home** view.
 {!message-actions.md!}
 {!down-chevron.md!}
 
-2. Select the **Mute the topic (topic name)** option from the dropdown to mute the topic that the selected message belongs to.
+2. Select the **Mute the topic (topic name)** option from the dropdown
+   to mute the topic that the selected message belongs to.
 
 4. Upon clicking **Mute the topic (topic name)**, a tooltip titled **Topic Muted** will
  appear, and any messages belonging to the topic will disappear from your view,

templates/zerver/help/unsubscribe-from-a-stream.md

@@ -1,10 +1,11 @@
 # Unsubscribe from a stream
 
-If you want to stop receiving messages from a particular stream in Zulip, you can choose to unsubscribe from that stream.
+If you want to stop receiving messages from a particular stream in
+Zulip, you can choose to unsubscribe from that stream.
 
-There are two major ways to unsubscribe from a stream: unsubscribing from a
-stream through the [Subscriptions](/#subscriptions) page and unsubscribing from
-a stream through the stream sidebar.
+There are two major ways to unsubscribe from a stream: unsubscribing
+from a stream through the [Subscriptions](/#subscriptions) page and
+unsubscribing from a stream through the stream sidebar.
 
 ## Unsubscribing from a stream through the Subscriptions page
 
@@ -20,7 +21,8 @@ confirming the success of your unsubscribing from the stream.
 
 ## Unsubscribing from a stream through the stream sidebar
 
-If you want to quickly unsubscribe from a single stream, you can do so through the stream sidebar.
+If you want to quickly unsubscribe from a single stream, you can do so
+through the stream sidebar.
 
 {!stream-actions.md!}
 

templates/zerver/help/view-an-image-at-full-size.md

@@ -10,6 +10,7 @@ Your screen will look like this:
 
 ![full-size](/static/images/help/full-size.png)
 
-From here, you can also open the image in a new tab or download it. These options can be seen in the top right of your screen.
+From here, you can also open the image in a new tab or download
+it. These options can be seen in the top right of your screen.
 
 Click the **X** in the top right to return to your Zulip chat.

tools/lint-all

@@ -436,7 +436,10 @@ def build_custom_checkers(by_lang):
                 failed = True
 
         for fn in by_lang['md']:
-            if custom_check_file(fn, markdown_rules):
+            max_length = None
+            if '/help/' in fn:
+                max_length = 120
+            if custom_check_file(fn, markdown_rules, max_length=max_length):
                 failed = True
 
         for fn in by_lang['txt'] + by_lang['text']: