nixops: use fish and fish-nix-shell consistently

nixops/desktop.nix

@@ -31,6 +31,7 @@ in
     wireshark pavucontrol
     jq ark sublime3 rink qemu_kvm konsole
     tmux xc3sprog m-labs.openocd screen gdb minicom picocom
+    (import ./fish-nix-shell)
   ];
   programs.wireshark.enable = true;
 
@@ -75,6 +76,9 @@ in
   hardware.bluetooth.enable = true;
 
   programs.fish.enable = true;
+  programs.fish.promptInit = ''
+    fish-nix-shell --info-right | source
+  '';
   users.defaultUserShell = pkgs.fish;
   users.extraGroups.plugdev = { };
   users.extraUsers.sb = {

nixops/fish-nix-shell/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 haslersn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+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 OR COPYRIGHT HOLDERS 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.

nixops/fish-nix-shell/README.md

@@ -0,0 +1,50 @@
+# fish-nix-shell
+fish support for the *nix-shell* environment of the Nix package manager.
+
+## Installation
+
+### Installation in the user environment
+
+Execute
+
+```
+nix-env -if https://github.com/haslersn/fish-nix-shell/archive/master.tar.gz
+```
+
+and add the following to your *~/.config/fish/config.fish*. Create it if it doesn't exist.
+
+```
+fish-nix-shell --info-right | source
+```
+
+### System-wide installation
+
+Add the package to your */etc/nixos/configuration.nix*:
+
+```
+  environment.systemPackages = with pkgs; [
+    #
+    # Other packages here ...
+    #
+    (import (fetchGit "https://github.com/haslersn/fish-nix-shell"))
+  ];
+```
+
+and then execute: `sudo nixos-rebuild switch`
+
+If you want to configure it system-wide, also add:
+
+```
+  programs.fish.enable = true;
+  programs.fish.promptInit = ''
+    fish-nix-shell --info-right | source
+  '';
+```
+
+## Flags
+
+The `fish-nix-shell` command **optionally** takes the following flags:
+
+| Flag | Meaning |
+| - | - |
+| `--info-right` | While in a *fish-nix-shell*, display information about the loaded packages at the right.

nixops/fish-nix-shell/bin/fish-nix-shell

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+function init_fish () {
+                cat <<EOF
+
+# Overwrite the nix-shell command
+function nix-shell
+    fish-nix-shell-wrapper \$argv
+    set -gx FISH_NIX_SHELL_EXIT_STATUS \$status
+end
+EOF
+    for arg in "$@"; do
+        case "$arg" in
+            --info-right)
+                cat <<EOF
+
+# Print additional information inside a nix-shell environment
+function fish_right_prompt
+    nix-shell-info
+    set -e FISH_NIX_SHELL_EXIT_STATUS
+end
+EOF
+                ;;
+            *) exit 1;;
+        esac
+    done
+}
+
+cat <<EOF
+# If you see this output, you probably forgot to pipe this output into 'source':
+# fish-nix-shell $@ | source
+EOF
+
+init_fish "$@"

nixops/fish-nix-shell/bin/fish-nix-shell-wrapper

@@ -0,0 +1,22 @@
+#!/bin/sh
+fns () {
+    pkgs=$FISH_NIX_SHELL_PKGS
+    for arg in "$@"; do
+        if [[ $arg == -* ]]; then
+            pkg=
+            if [[ $arg == --pure ]] || [[ $arg == --command ]] || [[ $arg == --run ]]; then
+                command nix-shell $@
+                return
+            elif [[ $arg == -p ]] || [[ $arg == --packages ]]; then
+                pkg=1
+            fi
+        elif [[ $pkg == 1 ]]; then
+            pkgs+=" "$arg
+        fi
+    done
+    if [[ -n $name ]] && [[ $name != shell ]]; then
+        pkgs+=" "$name
+    fi
+    env FISH_NIX_SHELL_PKGS="$pkgs" nix-shell "$@" --command fish
+}
+fns "$@"

nixops/fish-nix-shell/bin/nix-shell-info

@@ -0,0 +1,21 @@
+#!/bin/sh
+if [[ $IN_NIX_SHELL != "" ]]; then
+    printf "\033[1;32m"
+    output=$(echo $FISH_NIX_SHELL_PKGS | xargs)
+    if [[ -n $name ]] && [[ $name != shell ]]; then
+        output+=" "$name
+    fi
+    if [[ -n $output ]]; then
+        output=$(echo $output $additional_pkgs | tr ' ' '\n' | sort -u | tr '\n' ' ' | xargs)
+        printf "$output "
+    else
+        printf "[unknown nix-shell] "
+    fi
+    printf "\033[0m"
+elif [[ $FISH_NIX_SHELL_EXIT_STATUS ]]; then
+    if [[ $FISH_NIX_SHELL_EXIT_STATUS == 0 ]]; then
+      printf "\033[1;36mexited nix-shell \033[0m"
+    else
+      printf "\033[1;31mERROR \033[0m"
+    fi
+fi

nixops/fish-nix-shell/default.nix

@@ -0,0 +1,16 @@
+with import <nixpkgs> {}; stdenv.mkDerivation rec {
+  name = "fish-nix-shell";
+  src = fetchGit "https://github.com/haslersn/fish-nix-shell";
+  nativeBuildInputs = [ makeWrapper ];
+  installPhase = ''
+    mkdir -p $out
+    cp LICENSE $out
+    cp -r bin $out
+    wrapProgram $out/bin/fish-nix-shell
+    wrapProgram $out/bin/fish-nix-shell-wrapper --prefix PATH ":" ${fish}/bin
+    wrapProgram $out/bin/nix-shell-info
+  '';
+  meta.description = "fish support for the nix-shell environment of the Nix package manager.";
+  meta.license = "MIT";
+  meta.homepage = https://github.com/haslersn/fish-nix-shell;
+}

nixops/rpi.nix

@@ -87,7 +87,13 @@ in
   documentation.enable = false;
   environment.systemPackages = with pkgs; [
     psmisc wget vim git usbutils lm_sensors file telnet mosh tmux xc3sprog m-labs.openocd screen gdb minicom picocom
+    (import ./fish-nix-shell)
   ];
+  programs.fish.enable = true;
+  programs.fish.promptInit = ''
+    fish-nix-shell --info-right | source
+  '';
+  users.defaultUserShell = pkgs.fish;
 
   nix.binaryCachePublicKeys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
   nix.binaryCaches = ["https://cache.nixos.org" "https://nixbld.m-labs.hk"];