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Port builtins/argparse to Rust

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This commit is contained in:
Henrik Hørlück Berg 2023-06-16 23:38:08 +02:00 committed by ridiculousfish
parent 6229f08200
commit 292f7b2be1
14 changed files with 1078 additions and 758 deletions
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2
CMakeLists.txt
View file

@ -99,7 +99,7 @@ endif()
# List of sources for builtin functions.
set(FISH_BUILTIN_SRCS
src/builtin.cpp src/builtins/argparse.cpp src/builtins/bind.cpp
src/builtin.cpp src/builtins/bind.cpp
src/builtins/cd.cpp
src/builtins/commandline.cpp src/builtins/complete.cpp
src/builtins/disown.cpp

1025
fish-rust/src/builtins/argparse.rs Normal file
View file

File diff suppressed because it is too large Load diff

1
fish-rust/src/builtins/mod.rs
View file

@ -1,6 +1,7 @@
pub mod shared;
pub mod abbr;
pub mod argparse;
pub mod bg;
pub mod block;
pub mod builtin;

4
fish-rust/src/builtins/shared.rs
View file

@ -37,6 +37,9 @@ pub const BUILTIN_ERR_TOO_MANY_ARGUMENTS: &str = "%ls: too many arguments\n";
/// Error message when integer expected
pub const BUILTIN_ERR_NOT_NUMBER: &str = "%ls: %ls: invalid integer\n";
/// Error message for unknown switch.
pub const BUILTIN_ERR_UNKNOWN: &str = "%ls: %ls: unknown option\n";
/// Error messages for unexpected args.
pub const BUILTIN_ERR_ARG_COUNT0: &str = "%ls: missing argument\n";
pub const BUILTIN_ERR_ARG_COUNT1: &str = "%ls: expected %d arguments; got %d\n";
@ -170,6 +173,7 @@ pub fn run_builtin(
) -> Option<c_int> {
match builtin {
RustBuiltin::Abbr => super::abbr::abbr(parser, streams, args),
RustBuiltin::Argparse => super::argparse::argparse(parser, streams, args),
RustBuiltin::Bg => super::bg::bg(parser, streams, args),
RustBuiltin::Block => super::block::block(parser, streams, args),
RustBuiltin::Builtin => super::builtin::builtin(parser, streams, args),

26
fish-rust/src/ffi.rs
View file

@ -25,6 +25,7 @@ include_cpp! {
#include "env.h"
#include "env_universal_common.h"
#include "event.h"
#include "exec.h"
#include "fallback.h"
#include "fds.h"
#include "fish_indent_common.h"
@ -119,6 +120,8 @@ include_cpp! {
generate!("env_var_t")
generate!("exec_subshell_ffi")
generate!("function_properties_t")
generate!("function_properties_ref_t")
generate!("function_get_props_autoload")
@ -203,9 +206,21 @@ impl parser_t {
self.vars_env_ffi()
}
pub fn set_var(&mut self, name: &wstr, value: &[&wstr], flags: EnvMode) -> libc::c_int {
pub fn set_var<T: AsRef<wstr>, U: AsRef<wstr>>(
&mut self,
name: T,
value: &[U],
flags: EnvMode,
) -> libc::c_int {
self.get_var_stack().set_var(name, value, flags)
}
pub fn get_func_name(&mut self, level: i32) -> Option<WString> {
let name = self.pin().get_function_name_ffi(c_int(level));
name.as_ref()
.map(|s| s.from_ffi())
.filter(|s| !s.is_empty())
}
}
unsafe impl Send for env_universal_t {}
@ -238,13 +253,18 @@ impl env_stack_t {
}
/// Helper to set a value.
pub fn set_var(&mut self, name: &wstr, value: &[&wstr], flags: EnvMode) -> libc::c_int {
pub fn set_var<T: AsRef<wstr>, U: AsRef<wstr>>(
&mut self,
name: T,
value: &[U],
flags: EnvMode,
) -> libc::c_int {
use crate::wchar_ffi::{wstr_to_u32string, W0String};
let strings: Vec<W0String> = value.iter().map(wstr_to_u32string).collect();
let ptrs: Vec<*const u32> = strings.iter().map(|s| s.as_ptr()).collect();
self.pin()
.set_ffi(
&name.to_ffi(),
&name.as_ref().to_ffi(),
flags.bits(),
ptrs.as_ptr() as *const c_void,
ptrs.len(),

2
fish-rust/src/wgetopt.rs
View file

@ -80,7 +80,7 @@ pub struct wgetopter_t<'opts, 'args, 'argarray> {
/// returned was found. This allows us to pick up the scan where we left off.
///
/// If this is empty, it means resume the scan by advancing to the next ARGV-element.
nextchar: &'args wstr,
pub nextchar: &'args wstr,
/// Index in ARGV of the next element to be scanned. This is used for communication to and from
/// the caller and for communication between successive calls to `getopt`.

6
src/builtin.cpp
View file

@ -29,7 +29,6 @@
#include <memory>
#include <string>
#include "builtins/argparse.h"
#include "builtins/bind.h"
#include "builtins/cd.h"
#include "builtins/commandline.h"
@ -350,7 +349,7 @@ static constexpr builtin_data_t builtin_datas[] = {
{L"_", &builtin_gettext, N_(L"Translate a string")},
{L"abbr", &implemented_in_rust, N_(L"Manage abbreviations")},
{L"and", &builtin_generic, N_(L"Run command if last command succeeded")},
{L"argparse", &builtin_argparse, N_(L"Parse options in fish script")},
{L"argparse", &implemented_in_rust, N_(L"Parse options in fish script")},
{L"begin", &builtin_generic, N_(L"Create a block of code")},
{L"bg", &implemented_in_rust, N_(L"Send job to background")},
{L"bind", &builtin_bind, N_(L"Handle fish key bindings")},
@ -524,6 +523,9 @@ static maybe_t<RustBuiltin> try_get_rust_builtin(const wcstring &cmd) {
if (cmd == L"abbr") {
return RustBuiltin::Abbr;
}
if (cmd == L"argparse") {
return RustBuiltin::Argparse;
}
if (cmd == L"bg") {
return RustBuiltin::Bg;
}

1
src/builtin.h
View file

@ -113,6 +113,7 @@ int parse_help_only_cmd_opts(help_only_cmd_opts_t &opts, int *optind, int argc,
/// An enum of the builtins implemented in Rust.
enum class RustBuiltin : int32_t {
Abbr,
Argparse,
Bg,
Block,
Builtin,

740
src/builtins/argparse.cpp
View file

@ -1,740 +0,0 @@
// Implementation of the argparse builtin.
//
// See issue #4190 for the rationale behind the original behavior of this builtin.
#include "config.h" // IWYU pragma: keep
#include "argparse.h"
#include <cerrno>
#include <cstdint>
#include <cwchar>
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>
#include "../builtin.h"
#include "../common.h"
#include "../env.h"
#include "../exec.h"
#include "../fallback.h" // IWYU pragma: keep
#include "../io.h"
#include "../maybe.h"
#include "../parser.h"
#include "../wcstringutil.h"
#include "../wgetopt.h" // IWYU pragma: keep
#include "../wutil.h" // IWYU pragma: keep
static const wcstring var_name_prefix = L"_flag_";
#define BUILTIN_ERR_INVALID_OPT_SPEC _(L"%ls: Invalid option spec '%ls' at char '%lc'\n")
namespace {
struct option_spec_t {
wchar_t short_flag;
wcstring long_flag;
wcstring validation_command;
std::vector<wcstring> vals;
bool short_flag_valid{true};
int num_allowed{0};
int num_seen{0};
explicit option_spec_t(wchar_t s) : short_flag(s) {}
};
using option_spec_ref_t = std::unique_ptr<option_spec_t>;
struct argparse_cmd_opts_t {
bool ignore_unknown = false;
bool print_help = false;
bool stop_nonopt = false;
size_t min_args = 0;
size_t max_args = SIZE_MAX;
wchar_t implicit_int_flag = L'\0';
wcstring name;
std::vector<wcstring> raw_exclusive_flags;
std::vector<wcstring> argv;
std::unordered_map<wchar_t, option_spec_ref_t> options;
std::unordered_map<wcstring, wchar_t> long_to_short_flag;
std::vector<std::vector<wchar_t>> exclusive_flag_sets;
};
} // namespace
static const wchar_t *const short_options = L"+:hn:six:N:X:";
static const struct woption long_options[] = {
{L"stop-nonopt", no_argument, 's'}, {L"ignore-unknown", no_argument, 'i'},
{L"name", required_argument, 'n'}, {L"exclusive", required_argument, 'x'},
{L"help", no_argument, 'h'}, {L"min-args", required_argument, 'N'},
{L"max-args", required_argument, 'X'}, {}};
// Check if any pair of mutually exclusive options was seen. Note that since every option must have
// a short name we only need to check those.
static int check_for_mutually_exclusive_flags(const argparse_cmd_opts_t &opts,
io_streams_t &streams) {
for (const auto &kv : opts.options) {
const auto &opt_spec = kv.second;
if (opt_spec->num_seen == 0) continue;
// We saw this option at least once. Check all the sets of mutually exclusive options to see
// if this option appears in any of them.
for (const auto &xarg_set : opts.exclusive_flag_sets) {
if (contains(xarg_set, opt_spec->short_flag)) {
// Okay, this option is in a mutually exclusive set of options. Check if any of the
// other mutually exclusive options have been seen.
for (const auto &xflag : xarg_set) {
auto xopt_spec_iter = opts.options.find(xflag);
if (xopt_spec_iter == opts.options.end()) continue;
const auto &xopt_spec = xopt_spec_iter->second;
// Ignore this flag in the list of mutually exclusive flags.
if (xopt_spec->short_flag == opt_spec->short_flag) continue;
// If it is a different flag check if it has been seen.
if (xopt_spec->num_seen) {
wcstring flag1;
if (opt_spec->short_flag_valid) flag1 = wcstring(1, opt_spec->short_flag);
if (!opt_spec->long_flag.empty()) {
if (opt_spec->short_flag_valid) flag1 += L"/";
flag1 += opt_spec->long_flag;
}
wcstring flag2;
if (xopt_spec->short_flag_valid) flag2 = wcstring(1, xopt_spec->short_flag);
if (!xopt_spec->long_flag.empty()) {
if (xopt_spec->short_flag_valid) flag2 += L"/";
flag2 += xopt_spec->long_flag;
}
// We want the flag order to be deterministic. Primarily to make unit
// testing easier.
if (flag1 > flag2) {
std::swap(flag1, flag2);
}
streams.err.append_format(
_(L"%ls: %ls %ls: options cannot be used together\n"),
opts.name.c_str(), flag1.c_str(), flag2.c_str());
return STATUS_CMD_ERROR;
}
}
}
}
}
return STATUS_CMD_OK;
}
// This should be called after all the option specs have been parsed. At that point we have enough
// information to parse the values associated with any `--exclusive` flags.
static int parse_exclusive_args(argparse_cmd_opts_t &opts, io_streams_t &streams) {
for (const wcstring &raw_xflags : opts.raw_exclusive_flags) {
const std::vector<wcstring> xflags = split_string(raw_xflags, L',');
if (xflags.size() < 2) {
streams.err.append_format(_(L"%ls: exclusive flag string '%ls' is not valid\n"),
opts.name.c_str(), raw_xflags.c_str());
return STATUS_CMD_ERROR;
}
std::vector<wchar_t> exclusive_set;
for (const auto &flag : xflags) {
if (flag.size() == 1 && opts.options.find(flag[0]) != opts.options.end()) {
// It's a short flag.
exclusive_set.push_back(flag[0]);
} else {
auto x = opts.long_to_short_flag.find(flag);
if (x != opts.long_to_short_flag.end()) {
// It's a long flag we store as its short flag equivalent.
exclusive_set.push_back(x->second);
} else {
streams.err.append_format(_(L"%ls: exclusive flag '%ls' is not valid\n"),
opts.name.c_str(), flag.c_str());
return STATUS_CMD_ERROR;
}
}
}
// Store the set of exclusive flags for use when parsing the supplied set of arguments.
opts.exclusive_flag_sets.push_back(exclusive_set);
}
return STATUS_CMD_OK;
}
static bool parse_flag_modifiers(const argparse_cmd_opts_t &opts, const option_spec_ref_t &opt_spec,
const wcstring &option_spec, const wchar_t **opt_spec_str,
io_streams_t &streams) {
const wchar_t *s = *opt_spec_str;
if (opt_spec->short_flag == opts.implicit_int_flag && *s && *s != L'!') {
streams.err.append_format(
_(L"%ls: Implicit int short flag '%lc' does not allow modifiers like '%lc'\n"),
opts.name.c_str(), opt_spec->short_flag, *s);
return false;
}
if (*s == L'=') {
s++;
if (*s == L'?') {
opt_spec->num_allowed = -1; // optional arg
s++;
} else if (*s == L'+') {
opt_spec->num_allowed = 2; // mandatory arg and can appear more than once
s++;
} else {
opt_spec->num_allowed = 1; // mandatory arg and can appear only once
}
}
if (*s == L'!') {
s++;
opt_spec->validation_command = wcstring(s);
// Move cursor to the end so we don't expect a long flag.
while (*s) s++;
} else if (*s) {
streams.err.append_format(BUILTIN_ERR_INVALID_OPT_SPEC, opts.name.c_str(),
option_spec.c_str(), *s);
return false;
}
// Make sure we have some validation for implicit int flags.
if (opt_spec->short_flag == opts.implicit_int_flag && opt_spec->validation_command.empty()) {
opt_spec->validation_command = L"_validate_int";
}
if (opts.options.find(opt_spec->short_flag) != opts.options.end()) {
streams.err.append_format(L"%ls: Short flag '%lc' already defined\n", opts.name.c_str(),
opt_spec->short_flag);
return false;
}
*opt_spec_str = s;
return true;
}
/// Parse the text following the short flag letter.
static bool parse_option_spec_sep(argparse_cmd_opts_t &opts, const option_spec_ref_t &opt_spec,
const wcstring &option_spec, const wchar_t **opt_spec_str,
wchar_t &counter, io_streams_t &streams) {
const wchar_t *s = *opt_spec_str;
if (*(s - 1) == L'#') {
if (*s != L'-') {
// Long-only!
s--;
opt_spec->short_flag = counter;
counter++;
}
if (opts.implicit_int_flag) {
streams.err.append_format(_(L"%ls: Implicit int flag '%lc' already defined\n"),
opts.name.c_str(), opts.implicit_int_flag);
return false;
}
opts.implicit_int_flag = opt_spec->short_flag;
opt_spec->short_flag_valid = false;
s++;
} else if (*s == L'-') {
opt_spec->short_flag_valid = false;
s++;
if (!*s) {
streams.err.append_format(BUILTIN_ERR_INVALID_OPT_SPEC, opts.name.c_str(),
option_spec.c_str(), *(s - 1));
return false;
}
} else if (*s == L'/') {
s++; // the struct is initialized assuming short_flag_valid should be true
if (!*s) {
streams.err.append_format(BUILTIN_ERR_INVALID_OPT_SPEC, opts.name.c_str(),
option_spec.c_str(), *(s - 1));
return false;
}
} else if (*s == L'#') {
if (opts.implicit_int_flag) {
streams.err.append_format(_(L"%ls: Implicit int flag '%lc' already defined\n"),
opts.name.c_str(), opts.implicit_int_flag);
return false;
}
opts.implicit_int_flag = opt_spec->short_flag;
opt_spec->num_allowed = 1; // mandatory arg and can appear only once
s++; // the struct is initialized assuming short_flag_valid should be true
} else {
if (*s != L'!' && *s != L'?' && *s != L'=') {
// No short flag separator and no other modifiers, so this is a long only option.
// Since getopt needs a wchar, we have a counter that we count up.
opt_spec->short_flag_valid = false;
s--;
opt_spec->short_flag = counter;
counter++;
} else {
// Try to parse any other flag modifiers
if (!parse_flag_modifiers(opts, opt_spec, option_spec, &s, streams)) return false;
}
}
*opt_spec_str = s;
return true;
}
/// This parses an option spec string into a struct option_spec.
static bool parse_option_spec(argparse_cmd_opts_t &opts, //!OCLINT(high npath complexity)
const wcstring &option_spec, wchar_t &counter,
io_streams_t &streams) {
if (option_spec.empty()) {
streams.err.append_format(
_(L"%ls: An option spec must have at least a short or a long flag\n"),
opts.name.c_str());
return false;
}
const wchar_t *s = option_spec.c_str();
if (!iswalnum(*s) && *s != L'#') {
streams.err.append_format(_(L"%ls: Short flag '%lc' invalid, must be alphanum or '#'\n"),
opts.name.c_str(), *s);
return false;
}
std::unique_ptr<option_spec_t> opt_spec(new option_spec_t{*s++});
// Try parsing stuff after the short flag.
if (*s && !parse_option_spec_sep(opts, opt_spec, option_spec, &s, counter, streams)) {
return false;
}
// Collect any long flag name.
if (*s) {
const wchar_t *const long_flag_start = s;
while (*s && (*s == L'-' || *s == L'_' || iswalnum(*s))) s++;
if (s != long_flag_start) {
opt_spec->long_flag = wcstring(long_flag_start, s);
if (opts.long_to_short_flag.count(opt_spec->long_flag) > 0) {
streams.err.append_format(L"%ls: Long flag '%ls' already defined\n",
opts.name.c_str(), opt_spec->long_flag.c_str());
return false;
}
}
}
if (!parse_flag_modifiers(opts, opt_spec, option_spec, &s, streams)) {
return false;
}
// Record our long flag if we have one.
if (!opt_spec->long_flag.empty()) {
auto ins = opts.long_to_short_flag.emplace(opt_spec->long_flag, opt_spec->short_flag);
assert(ins.second && "Should have inserted long flag");
(void)ins;
}
// Record our option under its short flag.
opts.options[opt_spec->short_flag] = std::move(opt_spec);
return true;
}
static int collect_option_specs(argparse_cmd_opts_t &opts, int *optind, int argc,
const wchar_t **argv, io_streams_t &streams) {
const wchar_t *cmd = argv[0];
// A counter to give short chars to long-only options because getopt needs that.
// Luckily we have wgetopt so we can use wchars - this is one of the private use areas so we
// have 6400 options available.
auto counter = static_cast<wchar_t>(0xE000);
while (true) {
if (std::wcscmp(L"--", argv[*optind]) == 0) {
++*optind;
break;
}
if (!parse_option_spec(opts, argv[*optind], counter, streams)) {
return STATUS_CMD_ERROR;
}
if (++*optind == argc) {
streams.err.append_format(_(L"%ls: Missing -- separator\n"), cmd);
return STATUS_INVALID_ARGS;
}
}
// Check for counter overreach once at the end because this is very unlikely to ever be reached.
if (counter > static_cast<wchar_t>(0xF8FF)) {
streams.err.append_format(_(L"%ls: Too many long-only options\n"), cmd);
return STATUS_INVALID_ARGS;
}
return STATUS_CMD_OK;
}
static int parse_cmd_opts(argparse_cmd_opts_t &opts, int *optind, //!OCLINT(high ncss method)
int argc, const wchar_t **argv, parser_t &parser, io_streams_t &streams) {
const wchar_t *cmd = argv[0];
int opt;
wgetopter_t w;
while ((opt = w.wgetopt_long(argc, argv, short_options, long_options, nullptr)) != -1) {
switch (opt) {
case 'n': {
opts.name = w.woptarg;
break;
}
case 's': {
opts.stop_nonopt = true;
break;
}
case 'i': {
opts.ignore_unknown = true;
break;
}
case 'x': {
// Just save the raw string here. Later, when we have all the short and long flag
// definitions we'll parse these strings into a more useful data structure.
opts.raw_exclusive_flags.push_back(w.woptarg);
break;
}
case 'h': {
opts.print_help = true;
break;
}
case 'N': {
long x = fish_wcstol(w.woptarg);
if (errno || x < 0) {
streams.err.append_format(_(L"%ls: Invalid --min-args value '%ls'\n"), cmd,
w.woptarg);
return STATUS_INVALID_ARGS;
}
opts.min_args = x;
break;
}
case 'X': {
long x = fish_wcstol(w.woptarg);
if (errno || x < 0) {
streams.err.append_format(_(L"%ls: Invalid --max-args value '%ls'\n"), cmd,
w.woptarg);
return STATUS_INVALID_ARGS;
}
opts.max_args = x;
break;
}
case ':': {
builtin_missing_argument(parser, streams, cmd, argv[w.woptind - 1],
/* print_hints */ false);
return STATUS_INVALID_ARGS;
}
case '?': {
builtin_unknown_option(parser, streams, cmd, argv[w.woptind - 1],
/* print_hints */ false);
return STATUS_INVALID_ARGS;
}
default: {
DIE("unexpected retval from wgetopt_long");
}
}
}
if (opts.print_help) return STATUS_CMD_OK;
if (std::wcscmp(L"--", argv[w.woptind - 1]) == 0) {
--w.woptind;
}
if (argc == w.woptind) {
// The user didn't specify any option specs.
streams.err.append_format(_(L"%ls: Missing -- separator\n"), cmd);
return STATUS_INVALID_ARGS;
}
if (opts.name.empty()) {
// If no name has been given, we default to the function name.
// If any error happens, the backtrace will show which argparse it was.
if (maybe_t<wcstring> fn = parser.get_function_name(1)) {
opts.name = fn.acquire();
} else {
opts.name = L"argparse";
}
}
*optind = w.woptind;
return collect_option_specs(opts, optind, argc, argv, streams);
}
static void populate_option_strings(const argparse_cmd_opts_t &opts, wcstring *short_options,
std::vector<woption> *long_options) {
for (const auto &kv : opts.options) {
const auto &opt_spec = kv.second;
if (opt_spec->short_flag_valid) short_options->push_back(opt_spec->short_flag);
woption_argument_t arg_type = no_argument;
if (opt_spec->num_allowed == -1) {
arg_type = optional_argument;
if (opt_spec->short_flag_valid) short_options->append(L"::");
} else if (opt_spec->num_allowed > 0) {
arg_type = required_argument;
if (opt_spec->short_flag_valid) short_options->append(L":");
}
if (!opt_spec->long_flag.empty()) {
long_options->push_back({opt_spec->long_flag.c_str(), arg_type, opt_spec->short_flag});
}
}
long_options->push_back(woption{});
}
static int validate_arg(parser_t &parser, const argparse_cmd_opts_t &opts, option_spec_t *opt_spec,
bool is_long_flag, const wchar_t *woptarg, io_streams_t &streams) {
// Obviously if there is no arg validation command we assume the arg is okay.
if (opt_spec->validation_command.empty()) return STATUS_CMD_OK;
std::vector<wcstring> cmd_output;
auto &vars = parser.vars();
vars.push(true);
vars.set_one(L"_argparse_cmd", ENV_LOCAL | ENV_EXPORT, opts.name);
if (is_long_flag) {
vars.set_one(var_name_prefix + L"name", ENV_LOCAL | ENV_EXPORT, opt_spec->long_flag);
} else {
vars.set_one(var_name_prefix + L"name", ENV_LOCAL | ENV_EXPORT,
wcstring(1, opt_spec->short_flag));
}
vars.set_one(var_name_prefix + L"value", ENV_LOCAL | ENV_EXPORT, woptarg);
int retval = exec_subshell(opt_spec->validation_command, parser, cmd_output, false);
for (const auto &output : cmd_output) {
streams.err.append(output);
streams.err.push(L'\n');
}
vars.pop();
return retval;
}
/// \return whether the option 'opt' is an implicit integer option.
static bool is_implicit_int(const argparse_cmd_opts_t &opts, const wchar_t *val) {
if (opts.implicit_int_flag == L'\0') {
// There is no implicit integer option.
return false;
}
// We succeed if this argument can be parsed as an integer.
errno = 0;
(void)fish_wcstol(val);
return errno == 0;
}
// Store this value under the implicit int option.
static int validate_and_store_implicit_int(parser_t &parser, const argparse_cmd_opts_t &opts,
const wchar_t *val, wgetopter_t &w, int long_idx,
io_streams_t &streams) {
// See if this option passes the validation checks.
auto found = opts.options.find(opts.implicit_int_flag);
assert(found != opts.options.end());
const auto &opt_spec = found->second;
int retval = validate_arg(parser, opts, opt_spec.get(), long_idx != -1, val, streams);
if (retval != STATUS_CMD_OK) return retval;
// It's a valid integer so store it and return success.
opt_spec->vals.clear();
opt_spec->vals.emplace_back(val);
opt_spec->num_seen++;
w.nextchar = nullptr;
return STATUS_CMD_OK;
}
static int handle_flag(parser_t &parser, const argparse_cmd_opts_t &opts, option_spec_t *opt_spec,
int long_idx, const wchar_t *woptarg, io_streams_t &streams) {
opt_spec->num_seen++;
if (opt_spec->num_allowed == 0) {
// It's a boolean flag. Save the flag we saw since it might be useful to know if the
// short or long flag was given.
assert(!woptarg);
if (long_idx == -1) {
opt_spec->vals.push_back(wcstring(1, L'-') + opt_spec->short_flag);
} else {
opt_spec->vals.push_back(L"--" + opt_spec->long_flag);
}
return STATUS_CMD_OK;
}
if (woptarg) {
int retval = validate_arg(parser, opts, opt_spec, long_idx != -1, woptarg, streams);
if (retval != STATUS_CMD_OK) return retval;
}
if (opt_spec->num_allowed == -1 || opt_spec->num_allowed == 1) {
// We're depending on `wgetopt_long()` to report that a mandatory value is missing if
// `opt_spec->num_allowed == 1` and thus return ':' so that we don't take this branch if
// the mandatory arg is missing.
opt_spec->vals.clear();
if (woptarg) {
opt_spec->vals.push_back(woptarg);
}
} else {
assert(woptarg);
opt_spec->vals.push_back(woptarg);
}
return STATUS_CMD_OK;
}
static int argparse_parse_flags(parser_t &parser, argparse_cmd_opts_t &opts,
const wchar_t *short_options, const woption *long_options,
const wchar_t *cmd, int argc, const wchar_t **argv, int *optind,
io_streams_t &streams) {
int opt;
int long_idx = -1;
wgetopter_t w;
while ((opt = w.wgetopt_long(argc, argv, short_options, long_options, &long_idx)) != -1) {
if (opt == ':') {
builtin_missing_argument(parser, streams, cmd, argv[w.woptind - 1],
false /* print_hints */);
return STATUS_INVALID_ARGS;
} else if (opt == '?') {
// It's not a recognized flag. See if it's an implicit int flag.
const wchar_t *arg_contents = argv[w.woptind - 1] + 1;
int retval = STATUS_CMD_OK;
if (is_implicit_int(opts, arg_contents)) {
retval = validate_and_store_implicit_int(parser, opts, arg_contents, w, long_idx,
streams);
} else if (!opts.ignore_unknown) {
streams.err.append_format(BUILTIN_ERR_UNKNOWN, cmd, argv[w.woptind - 1]);
retval = STATUS_INVALID_ARGS;
} else {
// Any unrecognized option is put back if ignore_unknown is used.
// This allows reusing the same argv in multiple argparse calls,
// or just ignoring the error (e.g. in completions).
opts.argv.push_back(arg_contents - 1);
// Work around weirdness with wgetopt, which crashes if we `continue` here.
if (w.woptind == argc) break;
// Explain to wgetopt that we want to skip to the next arg,
// because we can't handle this opt group.
w.nextchar = nullptr;
}
if (retval != STATUS_CMD_OK) return retval;
long_idx = -1;
continue;
} else if (opt == 1) {
// A non-option argument.
// We use `-` as the first option-string-char to disable GNU getopt's reordering,
// otherwise we'd get ignored options first and normal arguments later.
// E.g. `argparse -i -- -t tango -w` needs to keep `-t tango -w` in $argv, not `-t -w
// tango`.
opts.argv.push_back(argv[w.woptind - 1]);
continue;
}
// It's a recognized flag.
auto found = opts.options.find(opt);
assert(found != opts.options.end());
int retval = handle_flag(parser, opts, found->second.get(), long_idx, w.woptarg, streams);
if (retval != STATUS_CMD_OK) return retval;
long_idx = -1;
}
*optind = w.woptind;
return STATUS_CMD_OK;
}
// This function mimics the `wgetopt_long()` usage found elsewhere in our other builtin commands.
// It's different in that the short and long option structures are constructed dynamically based on
// arguments provided to the `argparse` command.
static int argparse_parse_args(argparse_cmd_opts_t &opts, const wchar_t **argv, int argc,
parser_t &parser, io_streams_t &streams) {
if (argc <= 1) return STATUS_CMD_OK;
// "+" means stop at nonopt, "-" means give nonoptions the option character code `1`, and don't
// reorder.
wcstring short_options = opts.stop_nonopt ? L"+:" : L"-:";
std::vector<woption> long_options;
populate_option_strings(opts, &short_options, &long_options);
// long_options should have a "null terminator"
assert(!long_options.empty() && long_options.back().name == nullptr);
const wchar_t *cmd = opts.name.c_str();
int optind;
int retval = argparse_parse_flags(parser, opts, short_options.c_str(), long_options.data(), cmd,
argc, argv, &optind, streams);
if (retval != STATUS_CMD_OK) return retval;
retval = check_for_mutually_exclusive_flags(opts, streams);
if (retval != STATUS_CMD_OK) return retval;
for (int i = optind; argv[i]; i++) {
opts.argv.push_back(argv[i]);
}
return STATUS_CMD_OK;
}
static int check_min_max_args_constraints(const argparse_cmd_opts_t &opts, const parser_t &parser,
io_streams_t &streams) {
UNUSED(parser);
const wchar_t *cmd = opts.name.c_str();
if (opts.argv.size() < opts.min_args) {
streams.err.append_format(BUILTIN_ERR_MIN_ARG_COUNT1, cmd, opts.min_args, opts.argv.size());
return STATUS_CMD_ERROR;
}
if (opts.max_args != SIZE_MAX && opts.argv.size() > opts.max_args) {
streams.err.append_format(BUILTIN_ERR_MAX_ARG_COUNT1, cmd, opts.max_args, opts.argv.size());
return STATUS_CMD_ERROR;
}
return STATUS_CMD_OK;
}
/// Put the result of parsing the supplied args into the caller environment as local vars.
static void set_argparse_result_vars(env_stack_t &vars, const argparse_cmd_opts_t &opts) {
for (const auto &kv : opts.options) {
const auto &opt_spec = kv.second;
if (!opt_spec->num_seen) continue;
if (opt_spec->short_flag_valid) {
vars.set(var_name_prefix + opt_spec->short_flag, ENV_LOCAL, opt_spec->vals);
}
if (!opt_spec->long_flag.empty()) {
// We do a simple replacement of all non alphanum chars rather than calling
// escape_string(long_flag, 0, STRING_STYLE_VAR).
wcstring long_flag = opt_spec->long_flag;
for (auto &pos : long_flag) {
if (!iswalnum(pos)) pos = L'_';
}
vars.set(var_name_prefix + long_flag, ENV_LOCAL, opt_spec->vals);
}
}
vars.set(L"argv", ENV_LOCAL, opts.argv);
}
/// The argparse builtin. This is explicitly not compatible with the BSD or GNU version of this
/// command. That's because fish doesn't have the weird quoting problems of POSIX shells. So we
/// don't need to support flags like `--unquoted`. Similarly we don't want to support introducing
/// long options with a single dash so we don't support the `--alternative` flag. That `getopt` is
/// an external command also means its output has to be in a form that can be eval'd. Because our
/// version is a builtin it can directly set variables local to the current scope (e.g., a
/// function). It doesn't need to write anything to stdout that then needs to be eval'd.
maybe_t<int> builtin_argparse(parser_t &parser, io_streams_t &streams, const wchar_t **argv) {
const wchar_t *cmd = argv[0];
int argc = builtin_count_args(argv);
argparse_cmd_opts_t opts;
int optind;
int retval = parse_cmd_opts(opts, &optind, argc, argv, parser, streams);
if (retval != STATUS_CMD_OK) {
// This is an error in argparse usage, so we append the error trailer with a stack trace.
// The other errors are an error in using *the command* that is using argparse,
// so our help doesn't apply.
builtin_print_error_trailer(parser, streams.err, cmd);
return retval;
}
if (opts.print_help) {
builtin_print_help(parser, streams, cmd);
return STATUS_CMD_OK;
}
retval = parse_exclusive_args(opts, streams);
if (retval != STATUS_CMD_OK) return retval;
// wgetopt expects the first argument to be the command, and skips it.
// if optind was 0 we'd already have returned.
assert(optind > 0 && "Optind is 0?");
retval = argparse_parse_args(opts, &argv[optind - 1], argc - optind + 1, parser, streams);
if (retval != STATUS_CMD_OK) return retval;
retval = check_min_max_args_constraints(opts, parser, streams);
if (retval != STATUS_CMD_OK) return retval;
set_argparse_result_vars(parser.vars(), opts);
return retval;
}

11
src/builtins/argparse.h
View file

@ -1,11 +0,0 @@
// Prototypes for executing builtin_getopt function.
#ifndef FISH_BUILTIN_ARGPARSE_H
#define FISH_BUILTIN_ARGPARSE_H
#include "../maybe.h"
class parser_t;
struct io_streams_t;
maybe_t<int> builtin_argparse(parser_t &parser, io_streams_t &streams, const wchar_t **argv);
#endif

5
src/exec.cpp
View file

@ -1255,3 +1255,8 @@ int exec_subshell(const wcstring &cmd, parser_t &parser, std::vector<wcstring> &
return exec_subshell_internal(cmd, parser, nullptr, &outputs, &break_expand, apply_exit_status,
false);
}
int exec_subshell_ffi(const wcstring &cmd, parser_t &parser, wcstring_list_ffi_t &outputs,
bool apply_exit_status) {
return exec_subshell(cmd, parser, outputs.vals, apply_exit_status);
}

2
src/exec.h
View file

@ -31,6 +31,8 @@ __warn_unused bool exec_job(parser_t &parser, const std::shared_ptr<job_t> &j,
int exec_subshell(const wcstring &cmd, parser_t &parser, bool apply_exit_status);
int exec_subshell(const wcstring &cmd, parser_t &parser, std::vector<wcstring> &outputs,
bool apply_exit_status);
int exec_subshell_ffi(const wcstring &cmd, parser_t &parser, wcstring_list_ffi_t &outputs,
bool apply_exit_status);
/// Like exec_subshell, but only returns expansion-breaking errors. That is, a zero return means
/// "success" (even though the command may have failed), a non-zero return means that we should

9
src/parser.cpp
View file

@ -349,6 +349,15 @@ bool parser_t::is_command_substitution() const {
return false;
}
wcstring parser_t::get_function_name_ffi(int level) {
auto name = get_function_name(level);
if (name.has_value()) {
return name.acquire();
} else {
return wcstring();
}
}
maybe_t<wcstring> parser_t::get_function_name(int level) {
if (level == 0) {
// Return the function name for the level preceding the most recent breakpoint. If there

2
src/parser.h
View file

@ -434,6 +434,8 @@ class parser_t : public std::enable_shared_from_this<parser_t> {
/// Remove the outermost block, asserting it's the given one.
void pop_block(const block_t *expected);
/// Avoid maybe_t usage for ffi, sends a empty string in case of none.
wcstring get_function_name_ffi(int level);
/// Return the function name for the specified stack frame. Default is one (current frame).
maybe_t<wcstring> get_function_name(int level = 1);