fish: time command execution

user/fish/fish_prompt.fish

@@ -118,6 +118,34 @@ function fish_git_prompt
 end
 
 
+############################################################
+# Program time indicator
+############################################################
+
+function __fish_prompt_set_last_command_start --on-event fish_preexec
+    set -g __fish_prompt_last_command_start (date +%s.%N)
+end
+
+function __fish_prompt_set_last_command_end --on-event fish_postexec
+    set -g __fish_prompt_last_command_end (date +%s.%N)
+end
+
+function fish_program_time_prompt
+    if test -z "$__fish_prompt_last_command_start"
+        or test -z "$__fish_prompt_last_command_end"
+        return
+    end
+
+    set -l diff (math $__fish_prompt_last_command_end - $__fish_prompt_last_command_start)
+    set -l diff (math "round ($diff * 100) / 100")
+
+    if test "$diff" -gt 1
+        _fish_prompt_normal " took "
+        _fish_prompt_warn (env LC_ALL=C printf "%.02f" "$diff")
+    end
+end
+
+
 ############################################################
 # Vi mode indicator
 ############################################################
@@ -175,6 +203,8 @@ function fish_prompt
 
     fish_git_prompt
 
+    fish_program_time_prompt
+
     # Line break
     echo