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cp: Add --interactive/-i flag

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- Add interactive flag which tells `cp` to prompt before overwriting
  files
- Accept 'yes', 'no', 'n', and 'y' as input, all other inputs will
  result in the prompt being shown again
This commit is contained in:
Erick Howard 2024-01-22 22:02:45 +08:00 committed by Andrew Kaster
parent 90d68d43ce
commit 3e0d1becd4
Notes: sideshowbarker 2024-07-17 07:09:53 +09:00 
Author: https://github.com/needlesslygrim 🔰
Commit: https://github.com/SerenityOS/serenity/commit/3e0d1becd4
Pull-request: https://github.com/SerenityOS/serenity/pull/22901
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/fdellwing
Reviewed-by: https://github.com/tcl3
1 changed files with 55 additions and 0 deletions
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55
Userland/Utilities/cp.cpp
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@ -20,6 +20,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
auto preserve = FileSystem::PreserveMode::Nothing;
bool recursion_allowed = false;
bool verbose = false;
bool interactive = false;
Vector<StringView> sources;
ByteString destination;
@ -56,6 +57,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
},
Core::ArgsParser::OptionHideMode::None,
});
args_parser.add_option(interactive, "Prompt before overwriting files", "interactive", 'i');
args_parser.add_option(recursion_allowed, "Copy directories recursively", "recursive", 'R');
args_parser.add_option(recursion_allowed, "Same as -R", nullptr, 'r');
args_parser.add_option(verbose, "Verbose", "verbose", 'v');
@ -72,10 +74,63 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool destination_is_existing_dir = FileSystem::is_directory(destination);
for (auto& source : sources) {
// FIXME: May be formatted wrong if destination is a directory with a trailing slash, e.g. if called as such:
// cp source dest/
// ... `destination_path` may be formatted as `dest//source`, which isn't strictly correct.
auto destination_path = destination_is_existing_dir
? ByteString::formatted("{}/{}", destination, LexicalPath::basename(source))
: destination;
if (interactive && FileSystem::exists(destination_path)) {
bool overwrite = false;
while (true) {
warn("cp: overwrite '{}'? ", destination_path);
fflush(stdout);
char* line = nullptr;
size_t n = 0;
ssize_t size = getline(&line, &n, stdin);
ScopeGuard guard([line] { free(line); });
// Strip trailing newline.
if (line[size - 1] == '\n') {
--size;
}
if (size == 1) {
if (*line == 'y') {
overwrite = true;
break;
}
if (*line == 'n') {
break;
}
} else if (size == 2) {
if ("no"sv.compare(StringView { line, static_cast<unsigned long>(size) }) == 0) {
break;
}
} else if (size == 3) {
if ("yes"sv.compare(StringView { line, static_cast<unsigned long>(size) }) == 0) {
overwrite = true;
break;
}
}
}
if (verbose) {
if (!overwrite) {
warnln("cp: skipping {}", destination_path);
continue;
}
warnln("cp: overwriting {}", destination_path);
}
if (!overwrite) {
continue;
}
}
auto result = FileSystem::copy_file_or_directory(
destination_path, source,
recursion_allowed ? FileSystem::RecursionMode::Allowed : FileSystem::RecursionMode::Disallowed,