Show loading indicator in prompt whilst plugins are loading

jmb.omp.toml

@@ -56,8 +56,15 @@ console_title_template = '{{ .Folder }}'
       always_enabled = true
 
 [[blocks]]
-  type = 'prompt'
-  alignment = 'right'
+  type = 'rprompt'
+  alignment = 'left'
+
+  [[blocks.segments]]
+    type = "text"
+    style = "plain"
+    foreground = "black"
+    background = "transparent"
+    template = "{{ if .Env.SHELL_LOADING }} loading {{ end }}"
 
   [[blocks.segments]]
     type = "executiontime"

sheldon.toml

@@ -10,6 +10,11 @@ shell = "zsh"
 defer = """{{ hooks?.pre | nl }}{% for file in files %}zsh-defer source "{{ file }}"\n{% endfor %}{{ hooks?.post | nl }}"""
 defer-more = """{{ hooks?.pre | nl }}{% for file in files %}zsh-defer -t 0.5 source "{{ file }}"\n{% endfor %}{{ hooks?.post | nl }}"""
 
+# Loading indicator
+# -----------------
+
+[plugins.show]
+local = "~/.zsh/plugins/loading"
 
 # Completions
 # -----------
@@ -96,3 +101,10 @@ apply = ["defer-more"]
 [plugins.ngrok]
 local = "~/.zsh/plugins"
 apply = ["defer-more"]
+
+# Loading indicator
+# -----------------
+
+[plugins.hide]
+local = "~/.zsh/plugins/loading"
+apply = ["defer-more"]

zsh/plugins/loading/hide.plugin.zsh

@@ -0,0 +1,4 @@
+#!/usr/bin/env zsh
+
+# Hide the loading indicator
+unset SHELL_LOADING

zsh/plugins/loading/show.plugin.zsh

@@ -0,0 +1,4 @@
+#!/usr/bin/env zsh
+
+# Show the loading indicator
+export SHELL_LOADING=true