first commit

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1605370193,
+        "narHash": "sha256-YyMTf3URDL/otKdKgtoMChu4vfVL3vCMkRqpGifhUn0=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5021eac20303a61fafe17224c087f5519baed54d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1608062904,
+        "narHash": "sha256-QVaxOnGwZoBtNTlnAV0aeC30ASeJpo583wjotmhpOtg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "647cc06986c1ae4a2bb05298e0cf598723e42970",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-20.09",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "tA's emacs setup";
+  inputs = {
+    nixpkgs = {
+      url = "github:NixOS/nixpkgs/nixos-20.09";
+    };
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+    };
+  };
+  outputs = { self, nixpkgs, flake-utils, ... }: 
+  flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs {
+        overlays = [ (import ./overlay.nix) ];
+        inherit system;
+      };
+    in {
+      defaultPackage = pkgs.ta.emacs;
+    }) // { 
+      overlay = import ./overlay.nix;
+    };
+}

overlay.nix

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+self: super:
+let
+  myEmacs = (super.emacs.override {
+    withGTK3 = false;
+    withGTK2 = false;
+    withX = false;
+  });
+  emacsWithPackages = (super.emacsPackagesGen myEmacs).emacsWithPackages;
+in {
+  ta = {
+    emacs =
+      emacsWithPackages (epkgs: (with epkgs.melpaStablePackages; [
+        magit
+        zerodark-theme
+      ]) ++ (with epkgs.melpaPackages; [
+        racket-mode
+        idris-mode
+        nix-mode
+      ]));
+  };
+}