ssd1306_oled_display_cli/AsciiPrintableStep.zig

169 lines
6.0 KiB
Zig

//! Publish Date: 2021_10_17
//! This file is hosted at github.com/marler8997/zig-build-repos and is meant to be copied
//! to projects that use it.
const std = @import("std");
const AsciiPrintableStep = @This();
step: std.build.Step,
builder: *std.build.Builder,
path: []const u8,
pub fn create(b: *std.build.Builder, opt: struct {
path: []const u8,
}) *AsciiPrintableStep {
var result = b.allocator.create(AsciiPrintableStep) catch @panic("OOM");
result.* = AsciiPrintableStep{
.step = std.build.Step.init(.{
.id = .custom,
.name = "AsciiPrintable",
.owner = b,
.makeFn = make,
}),
.builder = b,
.path = std.fs.path.resolve(b.allocator, &[_][]const u8{
b.build_root.path.?, opt.path,
}) catch @panic("memory"),
};
return result;
}
// TODO: this should be included in std.build, it helps find bugs in build files
fn hasDependency(step: *const std.build.Step, dep_candidate: *const std.build.Step) bool {
for (step.dependencies.items) |dep| {
// TODO: should probably use step.loop_flag to prevent infinite recursion
// when a circular reference is encountered, or maybe keep track of
// the steps encounterd with a hash set
if (dep == dep_candidate or hasDependency(dep, dep_candidate))
return true;
}
return false;
}
fn make(step: *std.build.Step, _: *std.Progress.Node) !void {
const self = @fieldParentPtr(AsciiPrintableStep, "step", step);
const zig_file = std.fmt.allocPrint(self.builder.allocator, "{s}/images.zig", .{self.path}) catch @panic("OOM");
defer self.builder.allocator.free(zig_file);
std.fs.accessAbsolute(zig_file, .{ .mode = .read_only }) catch {
// Printables file does not exist
// ASCII printables from 32 to 126
const file = try std.fs.createFileAbsolute(zig_file, .{
.read = false,
.truncate = true,
.lock = .Exclusive,
.lock_nonblocking = false,
.mode = 0o666,
.intended_io_mode = .blocking,
});
defer file.close();
const writer = file.writer();
try writer.print("pub const chars = &[_][]const u8{{\n", .{});
for (0..32) |_| {
try writer.print(" \"\",\n", .{});
}
for (32..127) |i| {
// if (i == 32) {
// try writer.print(" \"\",\n", .{});
// continue;
// }
const char_str = [_]u8{@intCast(u8, i)};
// Need to escape the following chars: 32 (' ') 92 ('\')
const label_param = parm: {
switch (i) {
32 => break :parm "label:\\ ",
92 => break :parm "label:\\\\",
else => break :parm "label:" ++ char_str,
}
};
const dest_file = std.fmt.allocPrint(self.builder.allocator, "{s}/{d}.bmp", .{ self.path, i }) catch @panic("OOM");
defer self.builder.allocator.free(dest_file);
// generate the file
// magick -background transparent -fill black -font Hack-Regular -density 72 -pointsize 8 label:42 test.bmp
try run(self.builder, &[_][]const u8{
"magick",
"-background",
"white",
"-fill",
"black",
"-font",
"Hack-Regular",
"-density",
"72",
"-pointsize",
"8",
label_param,
"-extent",
"5x8",
dest_file,
});
// 36 ($) and 81 (Q) are widest and only 9 wide
// Can chop right pixel I think
// try writer.print("{s}\n", .{[_]u8{@intCast(u8, i)}});
// add the embed
try writer.print(" @embedFile(\"{d}.bmp\"),\n", .{i});
}
try writer.print("}};\n", .{});
// if (!self.fetch_enabled) {
// step.addError(" Use -Dfetch to download it automatically, or run the following to clone it:", .{});
// std.os.exit(1);
// }
};
}
fn run(builder: *std.build.Builder, argv: []const []const u8) !void {
// {
// var msg = std.ArrayList(u8).init(builder.allocator);
// defer msg.deinit();
// const writer = msg.writer();
// var prefix: []const u8 = "";
// for (argv) |arg| {
// try writer.print("{s}\"{s}\"", .{ prefix, arg });
// prefix = " ";
// }
// std.log.debug("[RUN] {s}", .{msg.items});
// }
var child = std.ChildProcess.init(argv, builder.allocator);
child.stdin_behavior = .Ignore;
child.stdout_behavior = .Inherit;
child.stderr_behavior = .Inherit;
child.cwd = builder.build_root.path;
child.env_map = builder.env_map;
try child.spawn();
const result = try child.wait();
switch (result) {
.Exited => |code| if (code != 0) {
std.log.err("command failed with exit code {}", .{code});
{
var msg = std.ArrayList(u8).init(builder.allocator);
defer msg.deinit();
const writer = msg.writer();
var prefix: []const u8 = "";
for (argv) |arg| {
try writer.print("{s}\"{s}\"", .{ prefix, arg });
prefix = " ";
}
std.log.debug("[RUN] {s}", .{msg.items});
}
std.os.exit(0xff);
},
else => {
std.log.err("command failed with: {}", .{result});
std.os.exit(0xff);
},
}
}
// Get's the repository path and also verifies that the step requesting the path
// is dependent on this step.
pub fn getPath(self: anytype, who_wants_to_know: *const std.build.Step) []const u8 {
if (!hasDependency(who_wants_to_know, &self.step))
@panic("a step called AsciiPrintableStep.getPath but has not added it as a dependency");
return self.path;
}