add loadavg module

src/main.zig

@@ -9,6 +9,7 @@ const display = @import("modules/display.zig");
 const uptime = @import("modules/uptime.zig");
 const volume = @import("modules/volume.zig");
 const memory = @import("modules/memory.zig");
+const loadavg = @import("modules/loadavg.zig");
 const Module = @import("module.zig");
 
 pub fn main() !void {
@@ -24,6 +25,7 @@ pub fn main() !void {
 
     var modules = [_]Module{
         uptime.init(arena.allocator()).module,
+        loadavg.init(arena.allocator()).module,
         memory.init(arena.allocator()).module,
         volume.init(arena.allocator()).module,
         display.init(arena.allocator()).module,

src/modules/loadavg.zig

@@ -0,0 +1,29 @@
+const std = @import("std");
+const Module = @import("../module.zig");
+const Self = @This();
+
+module: Module,
+
+pub fn init(allocator: std.mem.Allocator) Self {
+    return .{
+        .module = .{
+            .allocator = allocator,
+            .getJsonFn = getJson,
+        },
+    };
+}
+
+pub fn getJson(module: *const Module) !Module.JSON {
+    const self = @fieldParentPtr(Self, "module", module);
+
+    var loadavg_file = try std.fs.openFileAbsolute("/proc/loadavg", .{});
+    defer loadavg_file.close();
+
+    const loadavg_string = try loadavg_file.reader().readAllAlloc(self.module.allocator, 64);
+    var loadavg_split = std.mem.splitScalar(u8, loadavg_string[0 .. loadavg_string.len - 1], ' ');
+    var loadavg = try std.fmt.parseFloat(f32, loadavg_split.first());
+
+    return .{
+        .full_text = try std.fmt.allocPrint(self.module.allocator, "{d:0>1.2}", .{loadavg}),
+    };
+}