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https://github.com/RGBCube/serenity
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LibCore: Make ArgsParser perform some completion if passed --complete
This makes it possible to autocomplete flags and options via the Shell.
This commit is contained in:
Ali Mohammad Pur
Ali Mohammad Pur
parent
e6bd1f8807
commit
fc4d36ccd0
2 changed files with 147 additions and 28 deletions
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@ -5,6 +5,7 @@
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "AK/JsonObject.h"
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#include <AK/Format.h>
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#include <AK/StringBuilder.h>
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#include <LibCore/ArgsParser.h>
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@ -30,6 +31,7 @@ ArgsParser::ArgsParser()
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{
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add_option(m_show_help, "Display help message and exit", "help", 0);
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add_option(m_show_version, "Print version", "version", 0);
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add_option(m_perform_autocomplete, "Perform autocompletion", "complete", 0);
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}
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bool ArgsParser::parse(int argc, char* const* argv, FailureBehavior failure_behavior)
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@ -110,7 +112,7 @@ bool ArgsParser::parse(int argc, char* const* argv, FailureBehavior failure_beha
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}
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// We're done processing options.
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// Now let's show version or help if requested.
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// Now let's show version or help if requested, or perform autocompletion if needed.
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if (m_show_version) {
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print_version(stdout);
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@ -118,6 +120,7 @@ bool ArgsParser::parse(int argc, char* const* argv, FailureBehavior failure_beha
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exit(0);
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return false;
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}
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if (m_show_help) {
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print_usage(stdout, argv[0]);
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if (failure_behavior == FailureBehavior::Exit || failure_behavior == FailureBehavior::PrintUsageAndExit)
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@ -125,6 +128,13 @@ bool ArgsParser::parse(int argc, char* const* argv, FailureBehavior failure_beha
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return false;
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}
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if (m_perform_autocomplete) {
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autocomplete(stdout, argv[0], Span<char const* const> { argv + optind, static_cast<size_t>(argc - optind) });
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if (failure_behavior == FailureBehavior::Exit || failure_behavior == FailureBehavior::PrintUsageAndExit)
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exit(0);
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return false;
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}
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// Now let's parse positional arguments.
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int values_left = argc - optind;
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@ -628,4 +638,110 @@ void ArgsParser::add_positional_argument(Vector<StringView>& values, char const*
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add_positional_argument(move(arg));
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}
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void ArgsParser::autocomplete(FILE* file, StringView program_name, Span<char const* const> remaining_arguments)
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{
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// We expect the full invocation of the program to be available as positional args,
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// e.g. `foo --bar arg -b` (program invoked as `foo --complete -- foo --bar arg -b`)
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auto first = true;
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auto seen_all_options = false;
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auto skip_next = false;
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StringView argument_to_complete;
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StringView option_to_complete;
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auto completing_option = false;
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for (auto& arg : remaining_arguments) {
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StringView argument { arg };
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completing_option = false;
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if (skip_next) {
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argument_to_complete = argument;
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skip_next = false;
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continue;
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}
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// Skip over the program name.
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if (first && program_name == argument) {
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first = false;
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continue;
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}
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if (seen_all_options) {
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argument_to_complete = argument;
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continue;
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}
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if (argument.starts_with("--")) {
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option_to_complete = argument;
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completing_option = true;
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if (argument == "--") {
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seen_all_options = true;
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continue;
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}
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// Look for a long option
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auto option_pattern = argument.substring_view(2);
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auto it = m_options.find_if([&](auto& option) { return StringView(option.long_name) == option_pattern; });
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if (it.is_end())
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continue;
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if (it->requires_argument)
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skip_next = true;
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continue;
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}
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if (argument.starts_with("-")) {
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option_to_complete = argument;
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completing_option = true;
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if (argument == "-") {
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option_to_complete = argument;
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continue;
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}
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// Look for a short option
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auto option_pattern = argument[argument.length() - 1];
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auto it = m_options.find_if([&](auto& option) { return option.short_name == option_pattern; });
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if (it.is_end())
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continue;
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if (it->requires_argument)
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skip_next = true;
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continue;
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}
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}
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// We don't know how to complete arguments quite yet.
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if (!completing_option)
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return;
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auto write_completion = [&](auto format, auto... args) {
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JsonObject object;
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object.set("completion", String::formatted(format, args...));
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object.set("static_offset", 0);
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object.set("invariant_offset", option_to_complete.length());
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outln(file, "{}", object.to_string());
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};
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if (option_to_complete.starts_with("--")) {
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// Complete a long option.
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auto option_pattern = option_to_complete.substring_view(2);
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for (auto& option : m_options) {
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StringView option_string = option.long_name;
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if (option_string.starts_with(option_pattern)) {
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write_completion("--{}", option_string);
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}
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}
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} else {
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// Complete a short option, note that we're not going to attempt to 'match' anything here.
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for (auto& option : m_options) {
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if (option.short_name == 0)
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continue;
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write_completion("-{}", option.short_name);
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}
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}
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}
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}
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@ -32,11 +32,11 @@ public:
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struct Option {
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bool requires_argument { true };
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const char* help_string { nullptr };
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const char* long_name { nullptr };
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char const* help_string { nullptr };
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char const* long_name { nullptr };
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char short_name { 0 };
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const char* value_name { nullptr };
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Function<bool(const char*)> accept_value;
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char const* value_name { nullptr };
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Function<bool(char const*)> accept_value;
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String name_for_display() const
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{
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@ -47,11 +47,11 @@ public:
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};
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struct Arg {
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const char* help_string { nullptr };
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const char* name { nullptr };
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char const* help_string { nullptr };
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char const* name { nullptr };
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int min_values { 0 };
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int max_values { 1 };
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Function<bool(const char*)> accept_value;
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Function<bool(char const*)> accept_value;
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};
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bool parse(int argc, char* const* argv, FailureBehavior failure_behavior = FailureBehavior::PrintUsageAndExit);
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@ -61,42 +61,45 @@ public:
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}
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// *Without* trailing newline!
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void set_general_help(const char* help_string) { m_general_help = help_string; };
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void set_general_help(char const* help_string) { m_general_help = help_string; };
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void set_stop_on_first_non_option(bool stop_on_first_non_option) { m_stop_on_first_non_option = stop_on_first_non_option; }
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void print_usage(FILE*, const char* argv0);
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void print_usage_terminal(FILE*, const char* argv0);
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void print_usage_markdown(FILE*, const char* argv0);
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void print_usage(FILE*, char const* argv0);
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void print_usage_terminal(FILE*, char const* argv0);
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void print_usage_markdown(FILE*, char const* argv0);
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void print_version(FILE*);
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void add_option(Option&&);
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void add_ignored(const char* long_name, char short_name);
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void add_option(bool& value, const char* help_string, const char* long_name, char short_name);
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void add_option(const char*& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_option(String& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_ignored(char const* long_name, char short_name);
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void add_option(bool& value, char const* help_string, char const* long_name, char short_name);
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void add_option(char const*& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(String& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(StringView& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(int& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_option(unsigned& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_option(double& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_option(Optional<double>& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_option(Optional<size_t>& value, const char* help_string, const char* long_name, char short_name, const char* value_name);
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void add_option(int& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(unsigned& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(double& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(Optional<double>& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_option(Optional<size_t>& value, char const* help_string, char const* long_name, char short_name, char const* value_name);
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void add_positional_argument(Arg&&);
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void add_positional_argument(const char*& value, const char* help_string, const char* name, Required required = Required::Yes);
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void add_positional_argument(String& value, const char* help_string, const char* name, Required required = Required::Yes);
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void add_positional_argument(char const*& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(String& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(StringView& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(int& value, const char* help_string, const char* name, Required required = Required::Yes);
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void add_positional_argument(unsigned& value, const char* help_string, const char* name, Required required = Required::Yes);
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void add_positional_argument(double& value, const char* help_string, const char* name, Required required = Required::Yes);
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void add_positional_argument(Vector<const char*>& value, const char* help_string, const char* name, Required required = Required::Yes);
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void add_positional_argument(int& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(unsigned& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(double& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(Vector<char const*>& value, char const* help_string, char const* name, Required required = Required::Yes);
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void add_positional_argument(Vector<StringView>& value, char const* help_string, char const* name, Required required = Required::Yes);
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private:
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void autocomplete(FILE*, StringView program_name, Span<char const* const> remaining_arguments);
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Vector<Option> m_options;
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Vector<Arg> m_positional_args;
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bool m_show_help { false };
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bool m_show_version { false };
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const char* m_general_help { nullptr };
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bool m_perform_autocomplete { false };
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char const* m_general_help { nullptr };
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bool m_stop_on_first_non_option { false };
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};
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