My initial Nix configuration

config.nix

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+{
+  allowUnfree = true;
+}
+

home.nix

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+{ config, lib, pkgs, ... }:
+
+{
+  # Let Home Manager install and manage itself.
+  programs.home-manager.enable = true;
+
+  home.username = "salar";
+  home.homeDirectory = "/Users/salar";
+
+  # This value determines the Home Manager release that your
+  # configuration is compatible with. This helps avoid breakage
+  # when a new Home Manager release introduces backwards
+  # incompatible changes.
+  #
+  # You can update Home Manager without changing this value. See
+  # the Home Manager release notes for a list of state version
+  # changes in each release.
+  home.stateVersion = "20.09";
+
+  home.sessionVariables = {
+    EDITOR = "vim";
+  };
+
+  programs.git = {
+    enable = true;
+    userEmail = "code@softinio.com";
+    userName = "Salar Rahmanian";
+    ignores = [
+      "*~"
+      ".DS_Store"
+      "*.bloop"
+      "*.metals"
+      "*.metals.sbt"
+      "*metals.sbt"
+      "*.direnv"
+      "*.envrc" # there is lorri, nix-direnv & simple direnv; let people decide
+      "*hie.yaml" # ghcide files
+      "*.mill-version" # used by metals
+      "*.idea"
+      "*.vscode"
+      "*.python-version"
+    ];
+    extraConfig = {
+      core = {
+        editor = "emacs -nw";
+      };
+      merge.tool = "intellij";
+      mergetool = {
+        cmd = "idea merge \"$LOCAL\" \"$REMOTE\" \"$BASE\" \"$MERGED\"";
+        trustExitCode = true;
+        prompt = false;
+      };
+      diff.tool = "intellij";
+      difftool = {
+        cmd = "idea diff \"$LOCAL\" \"$REMOTE\"";
+        prompt = false;
+      };
+      url = {
+        "git@github.com:" = {
+          insteadOf = "https://github.com/";
+        };
+      };
+      pull = {
+        rebase = true;
+      };
+    };
+  };
+
+  programs.bat = {
+      enable = true;
+  };
+
+  programs.fzf = {
+    enable = true;
+    enableFishIntegration = true;
+  };
+
+  programs.direnv = {
+    enable = true;
+    enableFishIntegration = true;
+    enableNixDirenvIntegration = true;
+  };
+
+  programs.htop = {
+    enable = true;
+    sortDescending = true;
+    sortKey = "PERCENT_CPU";
+  };
+
+  programs.jq = {
+    enable = true;
+  };
+
+  programs.starship = {
+    enable = true;
+    settings = {
+      character.symbol = "λ";
+    };
+  };
+
+  programs.fish = {
+    enable = true;
+
+    plugins = [
+      {
+        name = "bass";
+        src = pkgs.fetchFromGitHub {
+          owner = "edc";
+          repo = "bass";
+          rev = "50eba266b0d8a952c7230fca1114cbc9fbbdfbd4";
+          sha256 = "0ppmajynpb9l58xbrcnbp41b66g7p0c9l2nlsvyjwk6d16g4p4gy";
+        };
+      }
+      {
+        name = "foreign-env";
+        src = pkgs.fetchFromGitHub {
+          owner = "oh-my-fish";
+          repo = "plugin-foreign-env";
+          rev = "dddd9213272a0ab848d474d0cbde12ad034e65bc";
+          sha256 = "00xqlyl3lffc5l0viin1nyp819wf81fncqyz87jx8ljjdhilmgbs";
+        };
+      }
+      {
+        name = "bobthefish";
+        src = pkgs.fetchFromGitHub {
+          owner = "oh-my-fish";
+          repo = "theme-bobthefish";
+          rev = "a2ad38aa051aaed25ae3bd6129986e7f27d42d7b";
+          sha256 = "1fssb5bqd2d7856gsylf93d28n3rw4rlqkhbg120j5ng27c7v7lq";
+        };
+      }
+    ];
+
+    loginShellInit = ''
+      if test -e /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+        fenv source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+      end
+
+      if test -e /nix/var/nix/profiles/default/etc/profile.d/nix.sh
+        fenv source /nix/var/nix/profiles/default/etc/profile.d/nix.sh
+      end
+
+      if test -e $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh
+        fenv source $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh
+      end
+
+      set PATH $HOME/.emacs.d/bin /opt/local/bin $HOME/bin $PATH
+
+      set JAVA_HOME /Users/salar/.nix-profile/bin/java
+
+      set -x FZF_DEFAULT_OPTS "--preview='bat {} --color=always'" \n
+      set -x SKIM_DEFAULT_COMMAND "rg --files || fd || find ."
+      '';
+
+    promptInit = ''
+      eval (direnv hook fish)
+      any-nix-shell fish --info-right | source
+    '';
+
+    shellAliases = {
+      cat="bat";
+      du="ncdu --color dark -rr -x";
+      ping="prettyping";
+      ".." = "cd ..";
+      pj="python -m json.tool";
+      k="exa --long --header --git --all";
+      g="git";
+      gl="git log";
+      gc="git commit -m";
+      gca="git commit -am";
+      gws="git status";
+      gforksync="git fetch upstream && git merge upstream/master && git push origin master";
+      grep="grep --color=auto";
+      new-sbt="sbt new scala/scala-seed.g8";
+      nixre="home-manager switch";
+      nixgc="nix-collect-garbage -d";
+      nixq="nix-env -qa";
+      nixupdate="nix-channel --update";
+      nixupgrade="nix upgrade-nix";
+      nixup="nix-env -u";
+      nixversion="nix eval nixpkgs.lib.version";
+      nixdaemon="sudo launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist && launchctl start org.nixos.nix-daemon";
+      v="emacs -nw";
+      vc="emacsclient -c -a ''";
+      em="emacsclient -t -a ''";
+      tabninecfg="vc /Users/salar/Library/Preferences/TabNine/TabNine.toml";
+      sshfre1="ssh salar@fre1.softinio.net";
+      moshfre1="mosh salar@fre1.softinio.net";
+      portsupdate="sudo port -v selfupdate";
+    };
+  };
+
+  xdg.configFile."fish/conf.d/plugin-bobthefish.fish".text = lib.mkAfter ''
+    for f in $plugin_dir/*.fish
+      source $f
+    end
+    '';
+
+  nixpkgs.overlays = [
+    (import (builtins.fetchTarball https://github.com/nix-community/emacs-overlay/archive/master.tar.gz))
+  ];
+
+
+  home.packages = [
+    pkgs.fish
+    pkgs.git
+    pkgs.awscli
+    pkgs.pgcli
+    pkgs.tig
+    pkgs.ripgrep
+    pkgs.go
+    pkgs.hugo
+    pkgs.jansson
+    pkgs.universal-ctags
+    pkgs.httpie
+    pkgs.global
+    pkgs.fd
+    pkgs.curlFull
+    pkgs.wget
+    pkgs.readline
+    pkgs.tree
+    pkgs.exa
+    pkgs.mosh
+    pkgs.sbt
+    pkgs.scala
+    pkgs.scalafmt
+    pkgs.coursier
+    pkgs.ammonite
+    pkgs.bloop
+    pkgs.yarn
+    pkgs.openssl
+    pkgs.xz
+    pkgs.gitAndTools.hub
+    pkgs.gitAndTools.diff-so-fancy
+    pkgs.nodejs-12_x
+    pkgs.rustup
+    pkgs.jdk11
+    pkgs.mdbook
+    pkgs.ranger
+    pkgs.gnupg
+    pkgs.exercism
+    pkgs.niv
+    pkgs.ffmpeg
+    pkgs.gradle
+    pkgs.maven
+    pkgs.procs
+    pkgs.emacsUnstable
+    pkgs.shellcheck
+    pkgs.cabal-install
+    pkgs.hlint
+    pkgs.ghcid
+    pkgs.pandoc
+    pkgs.multimarkdown
+    pkgs.direnv
+    pkgs.nixfmt
+    pkgs.cmake
+    pkgs.any-nix-shell
+    pkgs.asciinema
+    pkgs.ncdu
+    pkgs.prettyping
+    pkgs.rnix-lsp
+  ];
+}