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const builtin = @import("builtin");
const std = @import("std");
const xdg = @import("xdg");
const Allocator = std.mem.Allocator;
const ArenaAllocator = std.heap.ArenaAllocator;
const ArrayList = std.ArrayList;
const Config = @This();
const CrossTarget = std.zig.CrossTarget;
const File = std.fs.File;
const NativeTargetInfo = std.zig.system.NativeTargetInfo;
const Target = std.Target;
allocator: Allocator,
/// Earlier in the list means more preferred.
supported_targets: ArrayList(Target),
pub fn init(allocator: Allocator) !Config {
var self = Config{
.allocator = allocator,
.supported_targets = ArrayList(Target).init(allocator),
};
errdefer self.deinit();
// Native target is always supported and at highest priority
try self.supported_targets.append(builtin.target);
const config_dirs = try xdg.getAllConfigDirs(allocator, "zup");
defer {
for (config_dirs) |s| allocator.free(s);
allocator.free(config_dirs);
}
for (config_dirs) |config_dir| {
const file_name = try std.fs.path.join(allocator, &.{ config_dir, "zup.json" });
defer allocator.free(file_name);
var file = std.fs.openFileAbsolute(file_name, .{}) catch |err| {
if (err == error.FileNotFound) {
continue;
} else {
return err;
}
};
defer file.close();
try self.readConfig(file);
}
return self;
}
pub fn deinit(self: *Config) void {
self.supported_targets.deinit();
self.* = undefined;
}
fn readConfig(self: *Config, file: File) !void {
var arena = ArenaAllocator.init(self.allocator);
defer arena.deinit();
const allocator = arena.allocator();
const ConfigJson = struct {
supported_targets: [][]u8,
};
var reader = std.json.reader(allocator, file.reader());
defer reader.deinit();
const parsed = try std.json.parseFromTokenSourceLeaky(
ConfigJson,
allocator,
&reader,
.{
.duplicate_field_behavior = .use_last,
.ignore_unknown_fields = true,
},
);
try self.supported_targets.ensureUnusedCapacity(parsed.supported_targets.len);
for (parsed.supported_targets) |target| {
const ct = CrossTarget.parse(.{
.arch_os_abi = target,
}) catch |e| {
std.log.warn(
"Failed to parse '{s}' as a target string: {}",
.{ target, e },
);
continue;
};
const nti = NativeTargetInfo.detect(ct) catch |e| {
std.log.warn(
"Failed to detect NativeTargetInfo from '{s}': {}",
.{ target, e },
);
continue;
};
self.supported_targets.appendAssumeCapacity(nti.target);
}
}
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