fish functions as derivation

derivations/fish/fish-functions.nix

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+{ stdenv, lib, buildFishPlugin }:
+
+buildFishPlugin rec {
+  pname = "my-fish-functions";
+  version = "1.0.0";
+
+  src = ./fish-functions; # use local directory
+
+  meta = with stdenv.lib; {
+    description = "My custom fish functions";
+  };
+}

derivations/fish/fish-functions/completions/bd.fish

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+#!/usr/bin/env fish
+# -*-  mode:fish; tab-width:4  -*-
+#
+# fish-completion for fish-bd
+# https://github.com/0rax/fish-bd
+#
+
+complete -c bd -s c --description "Classic mode : goes back to the first directory named as the string"
+complete -c bd -s s --description "Seems mode : goes back to the first directory containing string"
+complete -c bd -s i --description "Case insensitive move (implies seems mode)"
+complete -c bd -s h -x --description "Display help and exit"
+complete -c bd -A -f
+
+function __fish_bd_complete_dirs
+    printf (pwd | sed 's%/[^/]*$%/%; s/.$//; s|/|\\\n|g')
+end
+
+complete -c bd -a '(__fish_bd_complete_dirs)'

derivations/fish/fish-functions/functions/bd.fish

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+#!/usr/bin/env fish
+# -*-  mode:fish; tab-width:4  -*-
+#
+# fish-bd main & usage function
+# https://github.com/0rax/bd-fish
+#
+
+function bd
+
+    set -l oldpwd (pwd)
+    set -l newpwd ""
+    set -l opts   "$BD_OPT"
+    set -l args   (getopt "csih" $argv)
+
+    if [ $status -gt 0 ]
+        return 1
+    end
+    set args (echo $args | sed 's/^\s//' | tr ' ' '\n')
+
+    set -l i 1
+    for arg in $args
+        switch $arg
+        case "-h"
+            printf "# fish-bd v1.3.3 (https://github.com/0rax/bd-fish)
+
+Description:
+    Quickly go back to a parent directory up in your current working directory tree.
+    Don't write 'cd ../../..' redundantly, use bd instead.
+
+Usage:
+    bd [option] <pattern>
+
+Examples:
+    # You are in /home/user/my/path/is/very/long/
+    # And you want to go back to 'path', simple type
+    > bd path
+    # or
+    > bd -s pa
+    # or
+    > bd -i Pat
+    # And you are now in /home/user/my/path/
+
+Options:
+    -c <pattern>
+            Classic mode : goes back to the first directory matching the pattern (default)
+            Set if default using (set -gx BD_OPT 'classic')
+            Default mode when BD_OPT or CLI options are specified
+    -s <pattern>
+            Seems mode: goes back to the first directory starting with pattern
+            Set it as default using (set -gx BD_OPT 'sensitive')
+    -i <pattern>
+            Case insensitive mode: same as seems mode without case sensitity
+            Set it as default using (set -gx BD_OPT 'insensitive')
+    -h      Print this help and exit
+
+Note:
+    Fuzzy matching of a directory can be done with any mode using the built-in
+    fish-shell autocompletion. This allows you to enter any part of the path
+    and still match it.\n"
+            return 0
+        case "-s"
+            set opts "sensitive"
+        case "-i"
+            set opts "insensitive"
+        case "-c"
+            set opts "classic"
+        case "--"
+            set i (math $i + 1)
+            break
+        end
+        set i (math $i + 1)
+    end
+
+    if [ $i -gt (count $args) ]
+        cd ..
+        pwd
+        return 0
+    end
+
+    switch "$opts"
+    case "sensitive"
+        set newpwd (echo $oldpwd | sed 's|\(.*/'$args[$i]'[^/]*/\).*|\1|')
+    case "insensitive"
+        set newpwd (echo $oldpwd | perl -pe 's|(.*/'$args[$i]'[^/]*/).*|$1|i')
+    case '*' # classic
+        set newpwd (echo $oldpwd | sed 's|\(.*/'$args[$i]'/\).*|\1|')
+    end
+
+    if [ "$newpwd" = "$oldpwd" ]
+        echo "No such occurence." >&2
+    else
+        echo "$newpwd"
+        cd   "$newpwd"
+    end
+
+end

derivations/fish/fish-functions/functions/icat_auto.fish

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+function icat_auto
+  set cols (math (tput cols) - 1)
+  set lines (math (tput lines) - 1)
+  kitty +kitten icat --place $cols"x"$lines"@0x0" $argv
+end

derivations/fish/fish-functions/functions/up.fish

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+function up
+    if test -z "$argv"
+        cd ..
+    else
+        switch $argv
+            case '*'
+                for i in (seq $argv)
+                    cd ..
+                end
+        end
+    end
+end