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const std = @import("std");
const assert = std.debug.assert;
const fatal = @import("cli.zig").fatal;
pub const Path = struct {
buf: [std.fs.max_path_bytes]u8,
len: usize,
pub fn init(path: []const u8) Path {
var self: Path = undefined;
assert(path.len < self.buf.len);
self.len = path.len;
@memcpy(self.buf[0..path.len], path);
self.buf[self.len] = 0;
return self;
}
pub fn join(segments: anytype) Path {
var self: Path = undefined;
self.len = 0;
self.append(segments);
return self;
}
pub fn append(self: *Path, segments: anytype) void {
const info = @typeInfo(@TypeOf(segments)).@"struct";
comptime assert(info.is_tuple);
inline for (info.fields) |field| {
var seg: []const u8 = @field(segments, field.name);
if (seg.len > 0) {
if (self.len > 0 and seg[0] == std.fs.path.sep) seg = seg[1..];
if (seg[seg.len - 1] == std.fs.path.sep) seg = seg[0 .. seg.len - 1];
}
if (seg.len > 0) {
if (self.len > 0) {
self.buf[self.len] = std.fs.path.sep;
self.len += 1;
}
@memcpy(self.buf[self.len .. self.len + seg.len], seg);
self.len += seg.len;
}
}
self.buf[self.len] = 0;
}
pub fn name(self: *const Path) [:0]const u8 {
return self.buf[0..self.len :0];
}
pub fn basename(self: *const Path) []const u8 {
return std.fs.path.basename(self.name());
}
pub fn dir(self: *const Path) ?Path {
const dirname = std.fs.path.dirname(self.name()) orelse return null;
return .init(dirname);
}
/// Returns the relative name of `self` regarding to `root`.
/// Both paths must be absolute.
pub fn relname(self: *const Path, root: Path) ?[]const u8 {
assert(std.fs.path.isAbsolute(root.name()));
assert(std.fs.path.isAbsolute(self.name()));
if (!std.mem.startsWith(u8, self.name(), root.name())) return null;
if (self.len == root.len) return "";
var rel = self.buf[root.len..self.len];
if (rel[0] == std.fs.path.sep) rel = rel[1..];
return rel;
}
};
pub fn mkdir_all(path: Path) !void {
try std.fs.cwd().makePath(path.name());
}
pub fn touch(path: Path) !void {
const cwd = std.fs.cwd();
if (std.fs.path.dirname(path.name())) |dir| {
try cwd.makePath(dir);
}
const f = try cwd.createFileZ(path.name(), .{ .mode = 0o644 });
f.close();
}
pub fn rm(path: Path) !void {
std.fs.deleteTreeAbsolute(path.name()) catch |err| {
if (err != error.FileNotFound) return err;
};
}
pub fn cp_file(from_path: Path, to_path: Path) !void {
const from = from_path.name();
const to = to_path.name();
std.fs.deleteTreeAbsolute(to) catch |err| {
if (err != error.FileNotFound) return err;
};
if (to_path.dir()) |to_parent| try mkdir_all(to_parent);
try std.fs.copyFileAbsolute(from, to, .{});
}
pub fn cp_dir(allocator: std.mem.Allocator, from_path: Path, to_path: Path) !void {
const from = from_path.name();
const to = to_path.name();
std.fs.deleteTreeAbsolute(to) catch |err| {
if (err != error.FileNotFound) return err;
};
try mkdir_all(to_path);
try cp_tree(allocator, from, to);
}
pub fn mv_dir(allocator: std.mem.Allocator, from_path: Path, to_path: Path) !void {
const from = from_path.name();
const to = to_path.name();
std.fs.deleteTreeAbsolute(to) catch |err| {
if (err != error.FileNotFound) return err;
};
if (to_path.dir()) |to_parent| try mkdir_all(to_parent);
std.fs.renameAbsoluteZ(from, to) catch |err| {
if (err != error.RenameAcrossMountPoints) return err;
try std.fs.makeDirAbsoluteZ(to);
try cp_tree(allocator, from, to);
try rm(from_path);
};
}
pub fn mv_file(from_path: Path, to_path: Path) !void {
const from = from_path.name();
const to = to_path.name();
std.fs.deleteTreeAbsolute(to) catch |err| {
if (err != error.FileNotFound) return err;
};
if (to_path.dir()) |to_parent| try mkdir_all(to_parent);
std.fs.renameAbsoluteZ(from, to) catch |err| {
if (err != error.RenameAcrossMountPoints) return err;
try std.fs.copyFileAbsolute(from, to, .{});
try rm(from_path);
};
}
fn cp_tree(allocator: std.mem.Allocator, from: [:0]const u8, to: [:0]const u8) !void {
var from_dir = try std.fs.openDirAbsoluteZ(from, .{ .iterate = true });
defer from_dir.close();
var walker = try from_dir.walk(allocator);
defer walker.deinit();
while (try walker.next()) |entry| {
const dest: Path = .join(.{ to, entry.path });
switch (entry.kind) {
.directory => try std.fs.makeDirAbsoluteZ(dest.name()),
.file => {
const src: Path = .join(.{ from, entry.path });
try std.fs.copyFileAbsolute(src.name(), dest.name(), .{});
},
else => |k| fatal("cannot copy {s}", .{@tagName(k)}),
}
}
}
pub const File_Iterator = struct {
iter: std.fs.Dir.Iterator,
pub fn deinit(self: *File_Iterator) void {
self.iter.dir.close();
}
pub fn next(self: *File_Iterator) ?[]const u8 {
while (true) {
const entry = self.iter.next() catch unreachable orelse return null;
if (entry.kind == .file) return entry.name;
}
}
};
/// Iterate files of a directory with the given path. The path must be absolute.
/// If the directory does not exist, null will be returned.
pub fn iterate_files(path: Path) !?File_Iterator {
var dir = std.fs.openDirAbsoluteZ(path.name(), .{ .iterate = true }) catch |err| {
return switch (err) {
error.FileNotFound => null,
error.BadPathName, error.InvalidUtf8 => error.BadPathName,
error.NameTooLong => unreachable,
else => err,
};
};
return .{
.iter = dir.iterate(),
};
}
pub const Dir_Info = struct {
exists: bool,
empty: bool,
};
pub fn dir_info(path: Path) !Dir_Info {
var dir = std.fs.openDirAbsoluteZ(path.name(), .{ .iterate = true }) catch |err| {
return switch (err) {
error.FileNotFound => .{ .exists = false, .empty = false },
error.BadPathName, error.InvalidUtf8 => error.BadPathName,
error.NameTooLong => unreachable,
else => err,
};
};
defer dir.close();
var iter = dir.iterate();
const child = iter.next() catch unreachable;
return .{
.exists = true,
.empty = child == null,
};
}
pub fn file_exists(path: Path) !bool {
std.fs.accessAbsoluteZ(path.name(), .{}) catch |err| {
switch (err) {
error.FileNotFound => return false,
error.PermissionDenied => return false,
error.NameTooLong => unreachable,
else => return err,
}
};
return true;
}
/// Read the whole file into a buffer and returns the buffer. The caller is responsible
/// to deallocate the memory with the given allocator.
/// If the file does not exist, null will be returned.
pub fn read_file(allocator: std.mem.Allocator, path: Path) !?[]const u8 {
var f = std.fs.openFileAbsoluteZ(path.name(), .{}) catch |err| {
return switch (err) {
error.FileNotFound => null,
error.NameTooLong => unreachable,
else => err,
};
};
defer f.close();
const stats = try f.stat();
const buf = try allocator.alloc(u8, @intCast(stats.size));
errdefer allocator.free(buf);
var r = f.reader(buf);
var off: usize = 0;
while (off < buf.len) {
const n = try r.readStreaming(buf[off..]);
off += n;
}
return buf;
}
test "path join" {
var path: Path = undefined;
path = .join(.{});
try std.testing.expectEqualStrings("", path.name());
path = .join(.{ "relative", "local/dir" });
try std.testing.expectEqualStrings("relative/local/dir", path.name());
path = .join(.{ "relative/", "/local/dir" });
try std.testing.expectEqualStrings("relative/local/dir", path.name());
path = .join(.{ "/absolute", "local/dir" });
try std.testing.expectEqualStrings("/absolute/local/dir", path.name());
}
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