Add $fish_force_vi_cursor variable to allow cursor setting on unsupported terminals

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Ctrl-C no longer kills background jobs for which job control is disabled, matching POSIX semantics (#6828).
 - Improve Gradle completion
 - Fixed `pushd`'s behavior with respect to the directory stack when given an invalid argument
+- A new variable, `$fish_vi_force_cursor`, has been added. This can be set to force `fish_vi_cursor` to attempt changing the cursor shape in vi mode, regardless of terminal. Additionally, the `fish_vi_cursor` option `--force-iterm` has been deprecated; all usages can be replaced by setting `$fish_vi_force_cursor`.
 - The history file is now created with user-private permissions, matching other shells (#6926). The directory containing the history file remains private, so there should not have been any private date revealed.
 
 ### Syntax changes and new commands

doc_src/index.rst

@@ -1410,6 +1410,8 @@ The ``fish_vi_cursor`` function will be used to change the cursor's shape depend
 
 Additionally, ``blink`` can be added after each of the cursor shape parameters to set a blinking cursor in the specified shape.
 
+If the cursor shape does not appear to be changing after setting the above variables, it's likely your terminal emulator does not support the capabilities necessary to do this. It may also be the case, however, that `fish_vi_cursor` has not detected your terminal's features correctly (for example, if you are using `tmux`). If this is the case, you can force `fish_vi_cursor` to set the cursor shape by setting `$fish_vi_force_cursor` in `config.fish`. You'll have to restart fish for any changes to take effect. If cursor shape setting remains broken after this, it's almost certainly an issue with your terminal emulator, and not fish.
+
 .. _vi-mode-command:
 
 Command mode

share/functions/fish_vi_cursor.fish

@@ -10,6 +10,9 @@ function fish_vi_cursor -d 'Set cursor shape for different vi modes'
         return
     end
 
+    # If this variable is set, skip all checks
+    if not set -q fish_vi_force_cursor
+
         # Emacs Makes All Cursors Suck
         if set -q INSIDE_EMACS
             return
@@ -50,13 +53,13 @@ function fish_vi_cursor -d 'Set cursor shape for different vi modes'
         end
 
         # HACK: Explicitly disable on ITERM because of #3696, which is weirdness with multi-line prompts.
-    # We allow an explicit "--force-iterm" as first argument to skip this.
+        # --force-iterm is now deprecated; set $fish_vi_force_cursor instead
-    # It's recommended only if you don't use a multi-line prompt.
         if contains -- $argv[1] --force-iterm
             set -e argv[1]
         else if set -q ITERM_PROFILE
             return
         end
+    end
 
     set -l terminal $argv[1]
     set -q terminal[1]
@@ -114,4 +117,3 @@ function fish_vi_cursor -d 'Set cursor shape for different vi modes'
           end
          " | source
 end
-