fish: add fish_prompt to config

home/fish/default.nix

@@ -25,6 +25,7 @@
         exiftool -if '$CreateDate' -p '$FileName' "$input" | xargs -I {} jhead -n%Y-%m-%d-%H%M%S "$input/{}"
         end
       '';
+      fish_prompt = builtins.readFile ./fish_prompt.fish;
     };
   };
 }

home/fish/fish_prompt.fish

@@ -0,0 +1,144 @@
+# 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 -l retc red
+test $status = 0; and set retc green
+
+set -q __fish_git_prompt_showupstream
+or set -g __fish_git_prompt_showupstream auto
+
+function _nim_prompt_wrapper
+    set retc $argv[1]
+    set -l field_name $argv[2]
+    set -l 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
+
+set_color $retc
+echo -n '┬─'
+set_color -o green
+echo -n [
+
+if functions -q fish_is_root_user; and fish_is_root_user
+    set_color -o red
+else
+    set_color -o yellow
+end
+
+echo -n $USER
+set_color -o white
+echo -n @
+
+if test -z "$SSH_CLIENT"
+    set_color -o blue
+else
+    set_color -o cyan
+end
+
+echo -n (prompt_hostname)
+set_color -o white
+echo -n :(prompt_pwd)
+set_color -o green
+echo -n ']'
+
+# Date
+_nim_prompt_wrapper $retc '' (date +%X)
+
+# Vi-mode
+# The default mode prompt would be prefixed, which ruins our alignment.
+function fish_mode_prompt
+end
+
+if test "$fish_key_bindings" = fish_vi_key_bindings
+    or test "$fish_key_bindings" = fish_hybrid_key_bindings
+    set -l mode
+    switch $fish_bind_mode
+        case default
+            set mode (set_color --bold red)N
+        case insert
+            set mode (set_color --bold green)I
+        case replace_one
+            set mode (set_color --bold green)R
+            echo '[R]'
+        case replace
+            set mode (set_color --bold cyan)R
+        case visual
+            set mode (set_color --bold magenta)V
+    end
+    set mode $mode(set_color normal)
+    _nim_prompt_wrapper $retc '' $mode
+end
+
+
+# Virtual Environment
+set -q VIRTUAL_ENV_DISABLE_PROMPT
+or set -g VIRTUAL_ENV_DISABLE_PROMPT true
+set -q VIRTUAL_ENV
+and _nim_prompt_wrapper $retc V (basename "$VIRTUAL_ENV")
+
+# git
+set -l prompt_git (fish_git_prompt '%s')
+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 $retc B (acpi -b | cut -d' ' -f 4-)
+
+set -l nix_shell_info (
+        if test -n "$IN_NIX_SHELL"
+             echo -n "─[nix-shell]"
+        end
+    )
+echo -n "$nix_shell_info"
+
+# New line
+echo
+
+# Background jobs
+set_color normal
+
+for job in (jobs)
+    set_color $retc
+    echo -n '│ '
+    set_color brown
+    echo $job
+end
+
+set_color normal
+set_color $retc
+echo -n '╰─>'
+set_color -o red
+echo -n '$ '
+set_color normal