Initial commit

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org>

README.md

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+# nix-env.fish
+
+Sets up the Nix environment for a non-Nix-installed [Fish shell](http://fishshell.com).
+
+Beyond just setting up `$PATH` and the various `$NIX_*` environment variables, this also sets up `$fish_function_path` and `$fish_complete_path` to include any Nix-installed Fish functions/completions, and sources any Nix-installed Fish `conf.d` 
+
+## Install
+
+Any Fish package manager should be able to install this.
+
+### [Fisher](https://github.com/jorgebucaran/fisher)
+
+```fish
+fisher add lilyball/nix-env.fish
+```

conf.d/nix-env.fish

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+# Setup Nix
+set -l nix_profile_path ~/.nix-profile/etc/profile.d/nix.sh
+if test -e $nix_profile_path
+  # Source the nix setup script
+  # We're going to run the regular Nix profile under bash and then print out a few variables
+  for line in (env -u BASH_ENV bash -c '. "$0"; for name in PATH "${!NIX_@}"; do printf "%s=%s\0" "$name" "${!name}"; done' $nix_profile_path | string split0)
+    set -xg (string split -m 1 = $line)
+  end
+
+  # Insert Nix's fish share directories into fish's special variables
+  set -l nix_share ~/.nix-profile/share/fish
+  set -l nix_vendor_functions $nix_share/vendor_functions.d
+  if set -l idx (contains --index -- $__fish_data_dir/functions $fish_function_path)
+    # Fish has no way to simply insert into the middle of an array
+    set -l new_path $fish_function_path[1..$idx]
+    set new_path[$idx] $nix_vendor_functions
+    set fish_function_path $new_path $fish_function_path[$idx..-1]
+  else
+    set -a fish_function_path $nix_vendor_functions
+  end
+
+  set -l nix_vendor_comp $nix_share/vendor_completions.d
+  if set -l idx (contains --index -- $__fish_data_dir/completions $fish_complete_path)
+    set -l new_path $fish_complete_path[1..$idx]
+    set new_path[$idx] $nix_vendor_comp
+    set fish_complete_path $new_path $fish_complete_path[$idx..-1]
+  else
+    set -a fish_complete_path $nix_vendor_comp
+  end
+
+  set -l nix_conf $nix_share/vendor_conf.d
+  # In order to simulate being the extra conf, we need to make sure it hasn't been "overridden" yet
+  # we're not going to actually check for our actual extra confdir. And we're technically sourcing
+  # these files out of order, and can't stop anything in the real extra confdir from sourcing.
+  # This is cribbed from $__fish_data_dir/config.fish
+  set -l sourcelist
+  set -l configdir ~/.config
+  if set -q XDG_CONFIG_HOME
+    set configdir $XDG_CONFIG_HOME
+  end
+  for file in $configdir/fish/conf.d/*.fish $__fish_sysconf_dir/conf.d/*.fish
+    set -l basename (string replace -r '^.*/' '' -- $file)
+    contains -- $basename $sourcelist
+    and continue
+    set -a sourcelist $basename
+    # Don't source, these files have already been sourced by Fish's global setup
+  end
+  for file in $nix_conf/*.fish
+    set -l basename (string replace -r '^.*/' '' -- $file)
+    contains -- $basename $sourcelist
+    and continue
+    # Source the file
+    [ -f $file -a -r $file ]
+    and source $file
+  end
+end