Remove Nix files.

I am no longer using Nix for managing user packages, and I have no
interest in actually maintaining these files.

* git-email.texi (Installation): Remove Nix installation instructions.
* default.nix, flake.lock, flake.nix: Remove files.

Signed-off-by: Xinglu Chen <public@yoctocell.xyz>

4 files changed, 1 insertions, 129 deletions

diff --git a/default.nix b/default.nix
deleted file mode 100644
index 765b92a..0000000
--- a/default.nix
+++ /dev/null
@@ -1,40 +0,0 @@
-{ lib, fetchgit, nix-gitignore, emacsPackages }:
-let
-  inherit (emacsPackages) trivialBuild;
-  flakeRoot = toString ../.;
-in
-lib.recurseIntoAttrs rec {
-
-  git-email-full-git = trivialBuild rec {
-    pname = "git-email-full";
-    version = "master";
-    src = nix-gitignore.gitignoreSource (flakeRoot + ".gitignore") ./.;
-    packageRequires = with emacsPackages; [
-      magit
-      transient
-      notmuch
-    ];
-  };
-
-  git-email-git = trivialBuild rec {
-    pname = "git-email";
-    version = "master";
-    src = builtins.filterSource
-      (path: type:
-        baseNameOf path != "git-email-magit.el" &&
-        baseNameOf path != "git-email-notmuch.el" &&
-        baseNameOf path != "git-email-gnus.el"
-      ) ./.;
-  };
-
-  git-email = trivialBuild rec {
-    pname = "git-email";
-    version = "0.1.0";
-    src = fetchgit {
-      url = "https://git.sr.ht/~yoctocell/git-email";
-      rev = version;
-      sha256 = "EJ9+/tA7mKn2HQE3kU4HdCbQXtjWUeaUiqnq4HUb+2o=";
-    };
-  };
-
-}
diff --git a/doc/git-email.texi b/doc/git-email.texi
index 0653dae..f290878 100644
--- a/doc/git-email.texi
+++ b/doc/git-email.texi
@@ -121,36 +121,8 @@ you have to install it manually by cloning the Git repo and adding @samp{git-ema
 your @code{load-path}.  Or, you can install it using one of the options
 listed below.
 
-@menu
-* Nix::
-@end menu
-
-@node Nix
-@section Nix
-
-If you are using @uref{https://nixos.wiki/wiki/Flakes, nix flakes},
-three versions of the package are available:
-
-@itemize
-@item
-@samp{git-email-full-git} -- This includes all the optional libraries as
-is built from the latest master branch.
-
-@item
-@samp{git-email-git} -- This only contains the core `git-email.el`
-library and is built from the latest master branch.
-
-@item
-@samp{git-email} -- This is the package from the latest release.
-@end itemize
-
-You can install the package with
-
-@example
-nix profile install "git+https://git.sr.ht/~yoctocell/git-email#git-email@{-full-git,-git@}"
-@end example
-
 @node Guix
+@section Guix
 
 You can install git-email with guix by running @command{guix install
 --install-from-file=guix.scm}.
diff --git a/flake.lock b/flake.lock
deleted file mode 100644
index 52c007e..0000000
--- a/flake.lock
+++ /dev/null
@@ -1,43 +0,0 @@
-{
-  "nodes": {
-    "flake-utils": {
-      "locked": {
-        "lastModified": 1610051610,
-        "narHash": "sha256-U9rPz/usA1/Aohhk7Cmc2gBrEEKRzcW4nwPWMPwja4Y=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "3982c9903e93927c2164caa727cd3f6a0e6d14cc",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1612407036,
-        "narHash": "sha256-3wFGXSK9tQU/6dPfwjNUxygeZCbYxe0O0JXVyj1G2tk=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "04d5f1e3a87d413181af5d6dd68568228addf1c3",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
diff --git a/flake.nix b/flake.nix
deleted file mode 100644
index 06e5edc..0000000
--- a/flake.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{
-  description = "git-email.el flake";
-
-  inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
-  };
-
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let pkgs = nixpkgs.legacyPackages.${system};
-      in
-      rec {
-        packages = pkgs.lib.recurseIntoAttrs (pkgs.callPackage ./. {});
-        defaultPackage = packages.git-email-full-git;
-      });
-}