Fix #875 - allow customization of interview_label

docassemble/ALWeaver/data/questions/assembly_line.yml

@@ -446,7 +446,7 @@ script: |
   </script>
 ---
 code: |
-  interview_label_draft = interview.short_filename[:35]
+  interview_label_draft = interview.title
 ---
 event: update_state_list
 code: |
@@ -569,7 +569,7 @@ subquestion: |
   You can change these later in the Playground.
 fields:
   - Title in navigation bar: interview.title
-    default: ${ interview.short_filename_with_spaces }
+    default: ${ interview.short_filename_with_spaces }    
   - note: |
       **Your title is a little long.** Write an alternate version that
       will be used on mobile screens.
@@ -582,6 +582,16 @@ fields:
       val("interview.title").length > 25
     help: |
       This title will appear in the navigation bar on small screens.
+  - Use a different name for the output file (defaults to title): interview.customize_file_name
+    datatype: yesno
+    help: |
+      The filename is used to name the file when the user downloads it.
+
+      This will also be used to name some other variables in your YAML
+      file that are shown only internally.
+  - Custom filename: interview_label_draft
+    show if: interview.customize_file_name
+    default: ${ varname(interview.short_filename_with_spaces) }
   - Description of the form for metadata: interview.description
     default: |
       This interview helps someone in ${ state_name(interview.state, country_code=interview.default_country_code) } ${ interview.intro_prompt[0:1].lower() }${ interview.intro_prompt[1:] }.