Source
pub fn relativeWindows(allocator: Allocator, from: []const u8, to: []const u8) ![]u8 {
const cwd = try process.getCwdAlloc(allocator);
defer allocator.free(cwd);
const resolved_from = try resolveWindows(allocator, &[_][]const u8{ cwd, from });
defer allocator.free(resolved_from);
var clean_up_resolved_to = true;
const resolved_to = try resolveWindows(allocator, &[_][]const u8{ cwd, to });
defer if (clean_up_resolved_to) allocator.free(resolved_to);
const parsed_from = windowsParsePath(resolved_from);
const parsed_to = windowsParsePath(resolved_to);
const result_is_to = x: {
if (parsed_from.kind != parsed_to.kind) {
break :x true;
} else switch (parsed_from.kind) {
.NetworkShare => {
break :x !networkShareServersEql(parsed_to.disk_designator, parsed_from.disk_designator);
},
.Drive => {
break :x ascii.toUpper(parsed_from.disk_designator[0]) != ascii.toUpper(parsed_to.disk_designator[0]);
},
.None => {
break :x false;
},
}
};
if (result_is_to) {
clean_up_resolved_to = false;
return resolved_to;
}
var from_it = mem.tokenizeAny(u8, resolved_from, "/\\");
var to_it = mem.tokenizeAny(u8, resolved_to, "/\\");
while (true) {
const from_component = from_it.next() orelse return allocator.dupe(u8, to_it.rest());
const to_rest = to_it.rest();
if (to_it.next()) |to_component| {
if (windows.eqlIgnoreCaseWtf8(from_component, to_component))
continue;
}
var up_index_end = "..".len;
while (from_it.next()) |_| {
up_index_end += "\\..".len;
}
const result = try allocator.alloc(u8, up_index_end + @intFromBool(to_rest.len > 0) + to_rest.len);
errdefer allocator.free(result);
result[0..2].* = "..".*;
var result_index: usize = 2;
while (result_index < up_index_end) {
result[result_index..][0..3].* = "\\..".*;
result_index += 3;
}
var rest_it = mem.tokenizeAny(u8, to_rest, "/\\");
while (rest_it.next()) |to_component| {
result[result_index] = '\\';
result_index += 1;
@memcpy(result[result_index..][0..to_component.len], to_component);
result_index += to_component.len;
}
return allocator.realloc(result, result_index);
}
return [_]u8{};
}