update nim.fish sample prompt (#5066)

* update nim.fish sample prompt

- Use an helper function to wrap informations
- Add VIRTUAL_ENV infos, if any
- Add __fish_git_prompt, wrapped for the theme
- Add comments
- Remove ASCII failback symbols for tty
  (no more useful for me, but if someone really needs it, just ask)

* fish.nim: test -n __fish_git_prompt

share/tools/web_config/sample_prompts/nim.fish

@@ -1,19 +1,54 @@
 # name: Nim
 # author: Guilhem "Nim" Saurel − https://github.com/nim65s/dotfiles/
 
+# This prompt shows:
+# - green lines if the last return command is OK, red otherwise
+# - your user name, in red if root or yellow otherwise
+# - your hostname, in cyan if ssh or blue otherwise
+# - the current path (with prompt_pwd)
+# - date +%X
+# - the current virtual environment, if any
+# - the current git status, if any, with __fish_git_prompt
+# - the current battery state, if any, and if your power cable is unplugged, and if you have "acpi"
+# - current background jobs, if any
+
+# It goes from:
+# ┬─[nim@Hattori:~]─[11:39:00]
+# ╰─>$ echo here
+
+# To:
+# ┬─[nim@Hattori:~/w/dashboard]─[11:37:14]─[V:django20]─[G:master↑1|●1✚1…1]─[B:85%, 05:41:42 remaining]
+# │ 2	15054	0%	arrêtée	sleep 100000
+# │ 1	15048	0%	arrêtée	sleep 100000
+# ╰─>$ echo there
+
+set __fish_git_prompt_showupstream auto
+
+function _nim_prompt_wrapper
+    set retc $argv[1]
+    set field_name $argv[2]
+    set field_value $argv[3]
+
+    set_color normal
+    set_color $retc
+    echo -n '─'
+    set_color -o green
+    echo -n '['
+    set_color normal
+    test -n $field_name
+    and echo -n $field_name:
+    set_color $retc
+    echo -n $field_value
+    set_color -o green
+    echo -n ']'
+end
+
 function fish_prompt
     and set retc green
     or set retc red
-    tty | string match -q -r tty
-    and set tty tty
-    or set tty pts
 
     set_color $retc
-    if [ $tty = tty ]
-        echo -n .-
-    else
     echo -n '┬─'
-    end
     set_color -o green
     echo -n [
     if test "$USER" = root -o "$USER" = toor
@@ -31,53 +66,41 @@ function fish_prompt
     end
     echo -n (prompt_hostname)
     set_color -o white
-    #echo -n :(prompt_pwd)
-    echo -n :(pwd|sed "s=$HOME=~=")
+    echo -n :(prompt_pwd)
     set_color -o green
     echo -n ']'
-    set_color normal
-    set_color $retc
-    if [ $tty = tty ]
-        echo -n '-'
-    else
-        echo -n '─'
-    end
-    set_color -o green
-    echo -n '['
-    set_color normal
-    set_color $retc
-    echo -n (date +%X)
-    set_color -o green
-    echo -n ]
 
-    if type -q acpi
-        if [ (acpi -a 2> /dev/null | string match -r off) ]
-            echo -n '─['
-            set_color -o red
-            echo -n (acpi -b|cut -d' ' -f 4-)
-            set_color -o green
-            echo -n ']'
-        end
-    end
+    # Date
+    _nim_prompt_wrapper $retc '' (date +%X)
+
+    # Virtual Environment
+    set -q VIRTUAL_ENV
+    and _nim_prompt_wrapper $retc V (basename "$VIRTUAL_ENV")
+
+    # git
+    set prompt_git (__fish_git_prompt | string trim -c ' ()')
+    test -n "$prompt_git"
+    and _nim_prompt_wrapper $retc G $prompt_git
+
+    # Battery status
+    type -q acpi
+    and test (acpi -a 2> /dev/null | string match -r off)
+    and _nim_prompt_wrapper $retc B (acpi -b | cut -d' ' -f 4-)
+
+    # New line
     echo
+
+    # Background jobs
     set_color normal
     for job in (jobs)
         set_color $retc
-        if [ $tty = tty ]
-            echo -n '; '
-        else
         echo -n '│ '
-        end
         set_color brown
         echo $job
     end
     set_color normal
     set_color $retc
-    if [ $tty = tty ]
-        echo -n "'->"
-    else
     echo -n '╰─>'
-    end
     set_color -o red
     echo -n '$ '
     set_color normal