From 4e80ad46175cb6c01a75257841844cce066fbba4 Mon Sep 17 00:00:00 2001
From: ptrcnull <git@ptrcnull.me>
Date: Tue, 10 Oct 2023 20:03:39 +0200
Subject: [PATCH] get zigged idiot

---
 .drone.yml   | 18 -------------
 .gitignore   |  2 ++
 build.zig    | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++
 go.mod       |  3 ---
 main.go      | 48 -----------------------------------
 src/main.zig | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 144 insertions(+), 69 deletions(-)
 delete mode 100644 .drone.yml
 create mode 100644 .gitignore
 create mode 100644 build.zig
 delete mode 100644 go.mod
 delete mode 100644 main.go
 create mode 100644 src/main.zig

diff --git a/.drone.yml b/.drone.yml
deleted file mode 100644
index 288bdfb..0000000
--- a/.drone.yml
+++ /dev/null
@@ -1,18 +0,0 @@
----
-kind: pipeline
-
-steps:
-  - name: build
-    image: "golang:alpine"
-    commands:
-      - go build
-
-  - name: release
-    image: plugins/gitea-release
-    settings:
-      api_key:
-        from_secret: gitea_api_key
-      base_url: https://git.ddd.rip
-      files: bat-alert
-    when:
-      event: tag
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e73c965
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-cache/
+zig-out/
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..792e3b7
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,70 @@
+const std = @import("std");
+
+// Although this function looks imperative, note that its job is to
+// declaratively construct a build graph that will be executed by an external
+// runner.
+pub fn build(b: *std.Build) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard optimization options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+    // set a preferred release mode, allowing the user to decide how to optimize.
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "bat-alert",
+        // In this case the main source file is merely a path, however, in more
+        // complicated build scripts, this could be a generated file.
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    // This declares intent for the executable to be installed into the
+    // standard location when the user invokes the "install" step (the default
+    // step when running `zig build`).
+    b.installArtifact(exe);
+
+    // This *creates* a Run step in the build graph, to be executed when another
+    // step is evaluated that depends on it. The next line below will establish
+    // such a dependency.
+    const run_cmd = b.addRunArtifact(exe);
+
+    // By making the run step depend on the install step, it will be run from the
+    // installation directory rather than directly from within the cache directory.
+    // This is not necessary, however, if the application depends on other installed
+    // files, this ensures they will be present and in the expected location.
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    // This allows the user to pass arguments to the application in the build
+    // command itself, like this: `zig build run -- arg1 arg2 etc`
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    // This creates a build step. It will be visible in the `zig build --help` menu,
+    // and can be selected like this: `zig build run`
+    // This will evaluate the `run` step rather than the default, which is "install".
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    // Creates a step for unit testing. This only builds the test executable
+    // but does not run it.
+    const unit_tests = b.addTest(.{
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_unit_tests = b.addRunArtifact(unit_tests);
+
+    // Similar to creating the run step earlier, this exposes a `test` step to
+    // the `zig build --help` menu, providing a way for the user to request
+    // running the unit tests.
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_unit_tests.step);
+}
diff --git a/go.mod b/go.mod
deleted file mode 100644
index 2966d1d..0000000
--- a/go.mod
+++ /dev/null
@@ -1,3 +0,0 @@
-module git.ddd.rip/ptrcnull/bat-alert
-
-go 1.16
diff --git a/main.go b/main.go
deleted file mode 100644
index e3e512a..0000000
--- a/main.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package main
-
-import (
-    "flag"
-    "log"
-    "os"
-    "os/exec"
-    "strconv"
-    "strings"
-    "time"
-)
-
-func notify(msg string) {
-    cmd := exec.Command("notify-send", "-t", "5000", "-u", "critical", "bat-alert", msg)
-    err := cmd.Run()
-    if err != nil {
-        log.Println(err)
-    }
-}
-
-var targetFlag = flag.Int("target", 15, "when to send the alert")
-
-func main() {
-    flag.Parse()
-    sent := false
-    for {
-        capacity, err := os.ReadFile("/sys/class/power_supply/BAT0/capacity")
-        if err != nil {
-            notify("error: " + err.Error())
-        }
-
-        numCap, err := strconv.Atoi(strings.Trim(string(capacity), "\n"))
-        if err != nil {
-            notify("error: " + err.Error())
-        }
-
-        if numCap <= *targetFlag {
-            if !sent {
-                sent = true
-                notify("battery running low!")
-            }
-        } else {
-            sent = false
-        }
-
-        time.Sleep(time.Second * 10)
-    }
-}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..6665849
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,72 @@
+const std = @import("std");
+
+pub const std_options = struct {
+    pub const log_level = .info;
+};
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    const args = try std.process.argsAlloc(allocator);
+    defer std.process.argsFree(allocator, args);
+
+    var target: u8 = 15;
+
+    for (args, 0..) |arg, i| {
+        if (std.mem.eql(u8, arg, "--help")) {
+            const stdout = std.io.getStdOut().writer();
+            try stdout.print(
+                \\Usage: bat-alert [options]
+                \\
+                \\Options:
+                \\  -t, --target NUM	Target battery level
+                \\
+            , .{});
+            std.process.exit(0);
+        }
+
+        if (std.mem.eql(u8, arg, "--target") or std.mem.eql(u8, arg, "-t")) {
+            if (i + 1 == args.len) {
+                std.log.err("--target requires an argument", .{});
+                std.process.exit(1);
+            }
+
+            const parsedTarget = std.fmt.parseInt(u8, args[i + 1], 10) catch |err| {
+                std.log.err("invalid target '{s}': {}", .{ args[i + 1], err });
+                std.process.exit(1);
+            };
+            target = parsedTarget;
+        }
+    }
+
+    var sent = false;
+
+    while (true) {
+        const capacityFile = try std.fs.openFileAbsolute("/sys/class/power_supply/BAT0/capacity", .{});
+        var capacityStr = std.ArrayList(u8).init(allocator);
+        try capacityFile.reader().streamUntilDelimiter(capacityStr.writer(), '\n', null);
+        capacityFile.close();
+
+        // std.log.info("battery: {s}", .{capacityStr.items});
+
+        const capacity = try std.fmt.parseInt(u8, capacityStr.items, 10);
+        // std.log.info("battery (but parsed): {}", .{capacity});
+
+        if (capacity <= target) {
+            if (!sent) {
+                sent = true;
+                _ = try std.process.Child.exec(.{
+                    .allocator = allocator,
+                    .argv = &[_][]const u8{ "notify-send", "-t", "5000", "-u", "critical", "bat-alert", "battery running low!" },
+                });
+                std.log.info("[NOTIFY] battery running low!", .{});
+            }
+        } else {
+            sent = false;
+        }
+
+        std.time.sleep(10 * 1e9);
+    }
+}