Add Nix flake with devShell

.cargo/config

@@ -1,14 +0,0 @@
-[target.armv7-unknown-linux-gnueabihf]
-linker = "/usr/local/oecore-x86_64/sysroots/x86_64-oesdk-linux/usr/bin/arm-oe-linux-gnueabi/arm-oe-linux-gnueabi-gcc"
-rustflags = [
-  "-C", "link-arg=-march=armv7-a",
-  "-C", "link-arg=-marm",
-  "-C", "link-arg=-mfpu=neon",
-  "-C", "link-arg=-mfloat-abi=hard",
-  "-C", "link-arg=-mcpu=cortex-a9",
-  "-C", "link-arg=--sysroot=/usr/local/oecore-x86_64/sysroots/cortexa9hf-neon-oe-linux-gnueabi",
-]
-
-[build]
-# Set the default --target flag
-target = "armv7-unknown-linux-gnueabihf"

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "anyhow"
 version = "1.0.37"

README.md

@@ -169,7 +169,17 @@ Steps you can try if the script isn't working:
 
 If you want to play with the `restream` code, you will have to [install Rust](https://www.rust-lang.org/learn/get-started).
 
-There are two ways of building the required restream binary for streaming the reMarkable framebuffer. For both approaches, the generated restream binary will be located under `target/armv7-unknown-linux-gnueabihf/release/restream`.
+There are three ways of building the required restream binary for streaming the reMarkable framebuffer. For these approaches, the generated restream binary will be located under `target/armv7-unknown-linux-gnueabihf/release/restream`.
+
+- **Using nix flakes**
+    With [Nix](https://nixos.org/guides/install-nix.html) installed and
+    [Nix flakes](https://nixos.wiki/wiki/Flakes#Installing_flakes) enabled, you
+    can easily setup the devlopment environment with:
+    ```
+    nix develop
+    ```
+    After which you can simply run `cargo build --release` to build the restream
+    binary.
 
 - **Using docker and the toltec toolchain:**
   You can use the [toltec toolchain docker images](https://github.com/toltec-dev/toolchain) to build a restream binary compatible with the reMarkable.

flake.lock

@@ -0,0 +1,67 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1634851050,
+        "narHash": "sha256-N83GlSGPJJdcqhUxSCS/WwW5pksYf3VP1M13cDRTSVA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c91f3de5adaf1de973b797ef7485e441a65b8935",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1635844945,
+        "narHash": "sha256-tZcL307dj28jgEU1Wdn+zwG9neyW0H2+ZjdVhvJxh9g=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "b67e752c29f18a0ca5534a07661366d6a2c2e649",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1635992196,
+        "narHash": "sha256-+Duob7Ashxc/2pyhzZI3peZRLUlbzcmy2ZLzZN0Oups=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "a7d961b654c38b85877db7af4fac57ba3eaede16",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,49 @@
+{
+  description = "Stream the reMarkable screen to your computer";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+  };
+  outputs = {self,  nixpkgs, flake-utils, rust-overlay, ... }:
+  flake-utils.lib.eachDefaultSystem (system:
+  let
+    overlays = [ (import rust-overlay) ];
+    pkgs = import nixpkgs {
+      inherit system overlays;
+    };
+  in
+  with pkgs;
+  {
+    devShell = mkShell {
+      buildInputs = [
+        remarkable-toolchain
+        (rust-bin.stable.latest.default.override {
+          targets = [ "armv7-unknown-linux-gnueabihf" ];
+          extensions = [ "rust-src" ];
+        })
+        openssl.dev
+        pkg-config
+        cargo-watch
+        cargo-limit
+        shellcheck
+        lz4
+      ];
+      CARGO_BUILD_TARGET="armv7-unknown-linux-gnueabihf";
+      CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER="${pkgs.remarkable-toolchain}/sysroots/x86_64-codexsdk-linux/usr/bin/arm-remarkable-linux-gnueabi/arm-remarkable-linux-gnueabi-gcc";
+      CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_RUSTFLAGS=[
+        "-C link-arg=-march=armv7-a"
+        "-C link-arg=-marm"
+        "-C link-arg=-mfpu=neon"
+        "-C link-arg=-mfloat-abi=hard"
+        "-C link-arg=-mcpu=cortex-a9"
+        "-C link-arg=--sysroot=${pkgs.remarkable-toolchain}/sysroots/cortexa9hf-neon-remarkable-linux-gnueabi"
+      ];
+    };
+  });
+}