feat(fish): transient prompt

docs/docs/config-transient.mdx

@@ -8,7 +8,7 @@ import Tabs from "@theme/Tabs";
 import TabItem from "@theme/TabItem";
 
 :::info
-This feature only works in `zsh`, `powershell` and `cmd` for the time being.
+This feature only works in `fish`, `zsh`, `powershell` and `cmd` for the time being.
 :::
 
 Transient prompt, when enabled, replaces the prompt with a simpler one to allow more screen real estate.
@@ -68,6 +68,7 @@ properties below - defaults to `{{ .Shell }}> `
     { label: 'powershell', value: 'pwsh', },
     { label: 'cmd', value: 'cmd', },
     { label: 'zsh', value: 'zsh', },
+    { label: 'fish', value: 'fish', },
   ]
 }>
 <TabItem value="pwsh">
@@ -110,6 +111,17 @@ enable_poshtransientprompt
 
 Restart your shell or reload `.zshrc` using `exec zsh` for the changes to take effect.
 
+</TabItem>
+<TabItem value="fish">
+
+Invoke Oh My Posh in `~/.config/fish/config.fish` and add the following line below:
+
+```bash
+enable_poshtransientprompt
+```
+
+Restart your shell or reload fish using `exec fish` for the changes to take effect.
+
 </TabItem>
 </Tabs>
 

src/engine/engine.go

@@ -332,7 +332,7 @@ func (e *Engine) PrintExtraPrompt(promptType ExtraPromptType) string {
 			return prompt
 		}
 		return str
-	case shell.PWSH, shell.PWSH5, shell.CMD, shell.BASH:
+	case shell.PWSH, shell.PWSH5, shell.CMD, shell.BASH, shell.FISH:
 		str, _ := e.Writer.String()
 		return str
 	}

src/shell/scripts/omp.fish

@@ -1,28 +1,38 @@
-set -g POSH_THEME "::CONFIG::"
+set --global POSH_THEME "::CONFIG::"
-set -g POWERLINE_COMMAND "oh-my-posh"
+set --global POWERLINE_COMMAND "oh-my-posh"
-set -g CONDA_PROMPT_MODIFIER false
+set --global CONDA_PROMPT_MODIFIER false
-set -g omp_tooltip_command ""
+set --global omp_tooltip_command ""
+set --global omp_transient 0
 
 function fish_prompt
-    set -g omp_status_cache $status
+    if test "$omp_transient" = "1"
-    set -g omp_stack_count (count $dirstack)
+      ::OMP:: prompt print transient --config $POSH_THEME --shell fish
-    set -g omp_duration "$CMD_DURATION$cmd_duration"
+      return
+    end
+    set --global omp_status_cache $status
+    set --global omp_stack_count (count $dirstack)
+    set --global omp_duration "$CMD_DURATION$cmd_duration"
     # check if variable set, < 3.2 case
-    if set -q omp_lastcommand; and test "$omp_lastcommand" = ""
+    if set --query omp_lastcommand; and test "$omp_lastcommand" = ""
       set omp_duration 0
     end
     # works with fish >=3.2
-    if set -q omp_last_status_generation; and test "$omp_last_status_generation" = "$status_generation"
+    if set --query omp_last_status_generation; and test "$omp_last_status_generation" = "$status_generation"
       set omp_duration 0
     end
-    if set -q status_generation
+    if set --query status_generation
-      set -gx omp_last_status_generation $status_generation
+      set --global --export omp_last_status_generation $status_generation
     end
 
     ::OMP:: prompt print primary --config $POSH_THEME --shell fish --error $omp_status_cache --execution-time $omp_duration --stack-count $omp_stack_count
 end
 
 function fish_right_prompt
+    if test "$omp_transient" = "1"
+      echo -n ""
+      set omp_transient 0
+      return
+    end
     if test -n "$omp_tooltip_command"
       ::OMP:: prompt print tooltip --config $POSH_THEME --shell fish --command $omp_tooltip_command
       set omp_tooltip_command ""
@@ -34,7 +44,7 @@ end
 function postexec_omp --on-event fish_postexec
   # works with fish <3.2
   # pre and postexec not fired for empty command in fish >=3.2
-  set -gx omp_lastcommand $argv
+  set --global --export omp_lastcommand $argv
 end
 
 # tooltip
@@ -48,3 +58,15 @@ end
 function enable_poshtooltips
   bind \x20 _render_tooltip
 end
+
+# transient prompt
+
+function _render_transient
+  set omp_transient 1
+  commandline --function repaint
+  commandline --function execute
+end
+
+function enable_poshtransientprompt
+  bind \r _render_transient
+end