Initial code
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2
.gitignore
vendored
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.gitignore
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/.zig-cache
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/zig-out
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29
build.zig
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build.zig
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const std = @import("std");
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pub fn build(b: *std.Build) void {
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const target = b.standardTargetOptions(.{});
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const optimize = b.standardOptimizeOption(.{});
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const exe = b.addExecutable(.{
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.name = "powerbottom",
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.root_source_file = b.path("src/main.zig"),
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.target = target,
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.optimize = optimize,
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});
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b.installArtifact(exe);
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const run_cmd = b.addRunArtifact(exe);
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run_cmd.step.dependOn(b.getInstallStep());
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// This allows the user to pass arguments to the application in the build
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// command itself, like this: `zig build run -- arg1 arg2 etc`
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if (b.args) |args| {
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run_cmd.addArgs(args);
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}
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// This creates a build step. It will be visible in the `zig build --help` menu,
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// and can be selected like this: `zig build run`
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// This will evaluate the `run` step rather than the default, which is "install".
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const run_step = b.step("run", "Run the app");
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run_step.dependOn(&run_cmd.step);
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}
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72
build.zig.zon
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72
build.zig.zon
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.{
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// This is the default name used by packages depending on this one. For
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// example, when a user runs `zig fetch --save <url>`, this field is used
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// as the key in the `dependencies` table. Although the user can choose a
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// different name, most users will stick with this provided value.
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//
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// It is redundant to include "zig" in this name because it is already
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// within the Zig package namespace.
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.name = "powerbottom",
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// This is a [Semantic Version](https://semver.org/).
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// In a future version of Zig it will be used for package deduplication.
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.version = "0.0.0",
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// This field is optional.
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// This is currently advisory only; Zig does not yet do anything
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// with this value.
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//.minimum_zig_version = "0.11.0",
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// This field is optional.
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// Each dependency must either provide a `url` and `hash`, or a `path`.
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// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
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// Once all dependencies are fetched, `zig build` no longer requires
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// internet connectivity.
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.dependencies = .{
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// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
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//.example = .{
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// // When updating this field to a new URL, be sure to delete the corresponding
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// // `hash`, otherwise you are communicating that you expect to find the old hash at
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// // the new URL.
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// .url = "https://example.com/foo.tar.gz",
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//
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// // This is computed from the file contents of the directory of files that is
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// // obtained after fetching `url` and applying the inclusion rules given by
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// // `paths`.
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// //
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// // This field is the source of truth; packages do not come from a `url`; they
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// // come from a `hash`. `url` is just one of many possible mirrors for how to
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// // obtain a package matching this `hash`.
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// //
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// // Uses the [multihash](https://multiformats.io/multihash/) format.
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// .hash = "...",
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//
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// // When this is provided, the package is found in a directory relative to the
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// // build root. In this case the package's hash is irrelevant and therefore not
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// // computed. This field and `url` are mutually exclusive.
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// .path = "foo",
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// // When this is set to `true`, a package is declared to be lazily
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// // fetched. This makes the dependency only get fetched if it is
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// // actually used.
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// .lazy = false,
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//},
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},
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// Specifies the set of files and directories that are included in this package.
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// Only files and directories listed here are included in the `hash` that
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// is computed for this package. Only files listed here will remain on disk
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// when using the zig package manager. As a rule of thumb, one should list
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// files required for compilation plus any license(s).
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// Paths are relative to the build root. Use the empty string (`""`) to refer to
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// the build root itself.
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// A directory listed here means that all files within, recursively, are included.
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.paths = .{
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"build.zig",
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"build.zig.zon",
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"src",
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// For example...
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//"LICENSE",
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//"README.md",
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},
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}
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71
src/batteryinfo.zig
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src/batteryinfo.zig
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const std = @import("std");
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const _maxRead = 4096;
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pub const BatteryInfo = struct {
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Manufacturer: []u8,
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Model: []u8,
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Technology: []u8,
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CellSeriesCount: u32 = 0,
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Capacity: u32 = 0,
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CapacityDesign: u32 = 0,
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Vnow: f32 = 0,
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Vmin: f32 = 0,
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ChargeNow: u32 = 0,
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ChargeFull: u32 = 0,
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ChargeFullPercentageDesign: u32 = 0,
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ChargeFullDesign: u32 = 0,
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_allocator: std.mem.Allocator,
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pub fn deinit(self: *const BatteryInfo) void {
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self._allocator.free(self.Manufacturer);
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self._allocator.free(self.Model);
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self._allocator.free(self.Technology);
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}
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};
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fn _readInfo(allocator: std.mem.Allocator, dir: std.fs.Dir, path: []const u8) ![]u8 {
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const start = try dir.readFileAlloc(allocator, path, _maxRead);
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defer allocator.free(start);
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const trimmed = std.mem.trim(u8, start, "\r\n\t ");
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return allocator.dupe(u8, trimmed);
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}
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fn _readInfoU32(allocator: std.mem.Allocator, dir: std.fs.Dir, path: []const u8) !u32 {
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const info = try _readInfo(allocator, dir, path);
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defer allocator.free(info);
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return std.fmt.parseInt(u32, info, 10);
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}
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pub fn GetBatteryInfoAlloc(allocator: std.mem.Allocator, dir: std.fs.Dir) !BatteryInfo {
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const manufacturer = try _readInfo(allocator, dir, "manufacturer");
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const model = try _readInfo(allocator, dir, "model_name");
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const technology = try _readInfo(allocator, dir, "technology");
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var info = BatteryInfo{
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.Manufacturer = manufacturer,
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.Model = model,
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.Technology = technology,
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._allocator = allocator,
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};
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info.Capacity = try _readInfoU32(allocator, dir, "capacity");
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info.ChargeNow = try _readInfoU32(allocator, dir, "energy_now") / 1000;
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info.ChargeFull = try _readInfoU32(allocator, dir, "energy_full") / 1000;
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info.ChargeFullDesign = try _readInfoU32(allocator, dir, "energy_full_design") / 1000;
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if(info.ChargeFullDesign != 0) {
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info.ChargeFullPercentageDesign = 100 * info.ChargeFull / info.ChargeFullDesign;
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info.CapacityDesign = 100 * info.ChargeNow / info.ChargeFullDesign;
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}
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const Vnow = try _readInfoU32(allocator, dir, "voltage_now") / 1000;
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const Vmin = try _readInfoU32(allocator, dir, "voltage_min_design") / 1000;
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info.Vnow = @as(f32, @floatFromInt(Vnow)) / 1000;
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info.Vmin = @as(f32, @floatFromInt(Vmin)) / 1000;
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info.CellSeriesCount = @intFromFloat(@ceil(info.Vmin / 3.7));
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return info;
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}
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36
src/main.zig
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36
src/main.zig
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const std = @import("std");
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const batinfo = @import("batteryinfo.zig");
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pub fn main() !void {
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var buffer: [65535]u8 = undefined;
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var fba = std.heap.FixedBufferAllocator.init(&buffer);
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const allocator = fba.allocator();
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const powerSupply = try std.fs.cwd().openDir("/sys/class/power_supply", .{});
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var i:u32 = 0;
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while(true) : (i += 1) {
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const name = try std.fmt.allocPrint(allocator, "BAT{}", .{i});
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defer allocator.free(name);
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const batDir = powerSupply.openDir(name, .{}) catch |err| switch(err) {
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error.FileNotFound => {return;},
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else => {return err;},
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};
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const battery = try batinfo.GetBatteryInfoAlloc(allocator, batDir);
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defer battery.deinit();
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try printBattery(battery);
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}
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}
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fn printBattery(battery: batinfo.BatteryInfo) !void {
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const stdout = std.io.getStdOut().writer();
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try stdout.print("Battery {s} {s}\n", .{battery.Manufacturer, battery.Model});
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try stdout.print("\tTechnology: {s}\n", .{battery.Technology});
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try stdout.print("\tCell series count: {}s\n\n", .{battery.CellSeriesCount});
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try stdout.print("\tCapacity: {}%\n", .{battery.Capacity});
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try stdout.print("\tCapacity (design): {}%\n", .{battery.CapacityDesign});
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try stdout.print("\tVmin: {d:.2}V Per cell: {d:.2}V\n", .{battery.Vmin, battery.Vmin/@as(f32, @floatFromInt(battery.CellSeriesCount))});
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try stdout.print("\tVnow: {d:.2}V Per cell: {d:.2}V\n", .{battery.Vnow, battery.Vnow/@as(f32, @floatFromInt(battery.CellSeriesCount))});
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try stdout.print("\tCharge now: {}mAh\n", .{battery.ChargeNow});
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try stdout.print("\tCharge full: {}mAh\n", .{battery.ChargeFull});
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try stdout.print("\tCharge full (design): {}mAh\n\n", .{battery.ChargeFullDesign});
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}
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