zig/src-self-hosted/introspect.zig
Andrew Kelley 6943cefebf std.os.path.dirname: return null instead of empty slice
for when there is no directory component. Makes it harder
to write bugs.

closes #1017
2018-06-14 16:15:32 -04:00

56 lines
1.5 KiB
Zig

// Introspection and determination of system libraries needed by zig.
const std = @import("std");
const mem = std.mem;
const os = std.os;
const warn = std.debug.warn;
/// Caller must free result
pub fn testZigInstallPrefix(allocator: *mem.Allocator, test_path: []const u8) ![]u8 {
const test_zig_dir = try os.path.join(allocator, test_path, "lib", "zig");
errdefer allocator.free(test_zig_dir);
const test_index_file = try os.path.join(allocator, test_zig_dir, "std", "index.zig");
defer allocator.free(test_index_file);
var file = try os.File.openRead(allocator, test_index_file);
file.close();
return test_zig_dir;
}
/// Caller must free result
pub fn findZigLibDir(allocator: *mem.Allocator) ![]u8 {
const self_exe_path = try os.selfExeDirPath(allocator);
defer allocator.free(self_exe_path);
var cur_path: []const u8 = self_exe_path;
while (true) {
const test_dir = os.path.dirname(cur_path) orelse ".";
if (mem.eql(u8, test_dir, cur_path)) {
break;
}
return testZigInstallPrefix(allocator, test_dir) catch |err| {
cur_path = test_dir;
continue;
};
}
return error.FileNotFound;
}
pub fn resolveZigLibDir(allocator: *mem.Allocator) ![]u8 {
return findZigLibDir(allocator) catch |err| {
warn(
\\Unable to find zig lib directory: {}.
\\Reinstall Zig or use --zig-install-prefix.
\\
, @errorName(err));
return error.ZigLibDirNotFound;
};
}