zls/src/special/build_runner.zig

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const root = @import("@build@");
const std = @import("std");
const io = std.io;
const fmt = std.fmt;
const Builder = std.build.Builder;
const Pkg = std.build.Pkg;
const InstallArtifactStep = std.build.InstallArtifactStep;
const LibExeObjStep = std.build.LibExeObjStep;
const ArrayList = std.ArrayList;
///! This is a modified build runner to extract information out of build.zig
///! Modified from the std.special.build_runner
pub fn main() !void {
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
defer arena.deinit();
const allocator = &arena.allocator;
const builder = try Builder.create(allocator, "", "", "", "");
defer builder.destroy();
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builder.resolveInstallPrefix(null, Builder.DirList{});
try runBuild(builder);
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const stdout_stream = io.getStdOut().writer();
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// TODO: We currently add packages from every LibExeObj step that the install step depends on.
// Should we error out or keep one step or something similar?
// We also flatten them, we should probably keep the nested structure.
for (builder.top_level_steps.items) |tls| {
for (tls.step.dependencies.items) |step| {
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try processStep(stdout_stream, step);
}
}
}
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fn processStep(stdout_stream: anytype, step: *std.build.Step) anyerror!void {
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if (step.cast(InstallArtifactStep)) |install_exe| {
for (install_exe.artifact.packages.items) |pkg| {
try processPackage(stdout_stream, pkg);
}
} else if (step.cast(LibExeObjStep)) |exe| {
for (exe.packages.items) |pkg| {
try processPackage(stdout_stream, pkg);
}
} else {
for (step.dependencies.items) |unknown_step| {
try processStep(stdout_stream, unknown_step);
}
}
}
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fn processPackage(out_stream: anytype, pkg: Pkg) anyerror!void {
switch (pkg.path) {
.path => |path| try out_stream.print("{s}\x00{s}\n", .{ pkg.name, path }),
.generated => |generated| if (generated.path != null) try out_stream.print("{s}\x00{s}\n", .{ pkg.name, generated.path.? }),
}
if (pkg.dependencies) |dependencies| {
for (dependencies) |dep| {
try processPackage(out_stream, dep);
}
}
}
fn runBuild(builder: *Builder) anyerror!void {
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switch (@typeInfo(@typeInfo(@TypeOf(root.build)).Fn.return_type.?)) {
.Void => root.build(builder),
.ErrorUnion => try root.build(builder),
else => @compileError("expected return type of build to be 'void' or '!void'"),
}
}