From 3732fc05916cfc48f832c6d8cc21536723483e31 Mon Sep 17 00:00:00 2001
From: Jonni Liljamo <jonni@liljamo.com>
Date: Wed, 16 Jul 2025 21:44:26 +0300
Subject: [PATCH] feat: init

---
 .envrc     |  1 +
 .gitignore |  2 ++
 README.md  | 11 +++++++
 flake.lock | 27 +++++++++++++++++
 flake.nix  | 19 ++++++++++++
 main.ha    | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 146 insertions(+)
 create mode 100644 .envrc
 create mode 100644 .gitignore
 create mode 100644 README.md
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 main.ha

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..c4b17d7
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use_flake
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..de63302
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/.direnv/
+/test/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3676d5a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+# install-garmin-watch-face
+
+A small program to install a Garmin watch face.
+
+Like, really small, because it's actually just moving a file to a mounted
+directory. Yeah...
+
+Depends on [simple-mtpfs](https://github.com/phatina/simple-mtpfs).
+
+Maybe make hare bindings for https://github.com/libmtp/libmtp and do it
+directly, instead of depending on runtime external binaries.
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..b60bcb4
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1752517496,
+        "narHash": "sha256-nHo/Gle6z6lMZc5kGtMOBKkVw1/Z9ilYdV2e14+Q6bU=",
+        "owner": "liljamo",
+        "repo": "nixpkgs",
+        "rev": "98bc1dc9a61dc6350ab81625410bab51f28d36ac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "liljamo",
+        "ref": "hare-0.25.2",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..9170486
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,19 @@
+{
+  inputs = {
+    #nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    nixpkgs.url = "github:liljamo/nixpkgs/hare-0.25.2";
+  };
+
+  outputs = inputs @ {...}: let
+    pkgs = inputs.nixpkgs.legacyPackages."x86_64-linux";
+  in {
+      devShells.x86_64-linux.default = pkgs.mkShell {
+        buildInputs = with pkgs;
+          [
+            hare
+
+            simple-mtpfs
+          ];
+      };
+    };
+}
diff --git a/main.ha b/main.ha
new file mode 100644
index 0000000..39d8e76
--- /dev/null
+++ b/main.ha
@@ -0,0 +1,86 @@
+use fs;
+use getopt;
+use log;
+use os;
+use os::exec;
+use path;
+use strings;
+use temp;
+
+const GARMIN_APPS = "/GARMIN/APPS/";
+
+export fn main() void = {
+	const cmd = getopt::parse(os::args,
+		"garmin watch face installer",
+		('s', "skip MTP mount (testing)"),
+		"file",
+	);
+	defer getopt::finish(&cmd);
+
+	let skip_mount = false;
+	for (let opt .. cmd.opts) {
+		switch (opt.0) {
+		case 's' =>
+			skip_mount = true;
+		case => abort();
+		};
+	};
+
+	let file = "";
+	if (len(cmd.args) < 1) {
+		log::fatal("provide a file");
+	} else {
+		file = os::resolve(cmd.args[0]);
+		if (!os::exists(file)) {
+			log::fatal("provided file doesn't exist");
+		};
+		let parts = strings::split(file, ".")!;
+		defer free(parts);
+		if (parts[len(parts) - 1] != "prg") {
+			log::fatal("file does not seem to be a .prg file");
+		};
+	};
+
+	const temp_dir = temp::dir();
+	defer os::rmdirall(temp_dir)!;
+	log::printfln("created temporary directory: {}", temp_dir);
+
+	if (skip_mount) {
+		os::mkdirs(strings::concat(temp_dir, GARMIN_APPS)!, fs::mode::USER_RWX)!;
+	} else {
+		mount_mtp(temp_dir);
+	};
+
+	const apps_dir = strings::concat(temp_dir, GARMIN_APPS)!;
+	if (!os::exists(apps_dir)) {
+		log::fatal("/GARMIN/APPS doesn't exist in mount");
+	};
+
+	const file_dest = strings::concat(apps_dir, "face.prg")!;
+	log::printfln("moving {} to {}", file, file_dest);
+	os::move(file, file_dest)!;
+
+	// Remember to unmount the MTP fs.
+	if (!skip_mount) {
+		umount_mtp(temp_dir);
+	};
+
+	log::println("your new watch face should now show up");
+};
+
+fn mount_mtp(temp_dir: str) void = {
+	log::println("mounting MTP");
+	let cmd = exec::cmd("simple-mtpfs", temp_dir)!;
+	let proc = exec::start(&cmd)!;
+	let status = exec::wait(&proc)!;
+	if (status.status != 0) {
+		log::fatal("simple-mtpfs failed, most likely a permission issue");
+	};
+};
+
+fn umount_mtp(temp_dir: str) void = {
+	log::println("umounting MTP");
+	let cmd = exec::cmd("fusermount", "-u", temp_dir)!;
+	let proc = exec::start(&cmd)!;
+	let status = exec::wait(&proc)!;
+};
-- 
2.44.1