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Support $(cmd) command substitution as alternative to (cmd)

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For consistency with "$(cmd)" and with other shells.
This commit is contained in:
Johannes Altmanninger 2021-07-02 23:11:03 +02:00
parent ec3d3a481b
commit 0ab6735450
7 changed files with 21 additions and 71 deletions
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8
src/common.cpp
View file

@ -1390,8 +1390,12 @@ static bool unescape_string_internal(const wchar_t *const input, const size_t in
}
case L'$': {
if (unescape_special) {
to_append_or_none = VARIABLE_EXPAND;
vars_or_seps.push_back(input_position);
bool is_cmdsub =
input_position + 1 < input_len && input[input_position + 1] == L'(';
if (!is_cmdsub) {
to_append_or_none = VARIABLE_EXPAND;
vars_or_seps.push_back(input_position);
}
}
break;
}

2
src/expand.cpp
View file

@ -761,7 +761,7 @@ static expand_result_t expand_cmdsubst(wcstring input, const operation_context_t
wcstring whole_item;
whole_item.reserve(paren_begin + 1 + sub_item2.size() + 1 +
tail_item.completion.size());
whole_item.append(input, 0, paren_begin);
whole_item.append(input, 0, paren_begin - have_dollar);
whole_item.push_back(INTERNAL_SEPARATOR);
whole_item.append(sub_item2);
whole_item.push_back(INTERNAL_SEPARATOR);

11
src/fish_tests.cpp
View file

@ -4654,6 +4654,8 @@ void history_tests_t::test_history_formats() {
// We don't expect whitespace to be elided (#4908: except for leading/trailing whitespace)
const wchar_t *expected[] = {L"EOF",
L"sleep 123",
L"posix_cmd_sub $(is supported but only splits on newlines)",
L"posix_cmd_sub \"$(is supported)\"",
L"a && echo valid construct",
L"final line",
L"echo supsup",
@ -5102,8 +5104,7 @@ static void test_error_messages() {
{L"echo $", ERROR_NO_VAR_NAME},
{L"echo foo\"$\"bar", ERROR_NO_VAR_NAME},
{L"echo \"foo\"$\"bar\"", ERROR_NO_VAR_NAME},
{L"echo foo $ bar", ERROR_NO_VAR_NAME},
{L"echo foo$(foo)bar", ERROR_BAD_VAR_SUBCOMMAND1}};
{L"echo foo $ bar", ERROR_NO_VAR_NAME}};
parse_error_list_t errors;
for (const auto &test : error_tests) {
@ -5193,6 +5194,12 @@ static void test_highlighting() {
{L"|", highlight_role_t::statement_terminator},
{L"cat", highlight_role_t::command},
});
highlight_tests.push_back({
{L"true", highlight_role_t::command},
{L"$(", highlight_role_t::operat},
{L"true", highlight_role_t::command},
{L")", highlight_role_t::operat},
});
highlight_tests.push_back({
{L"true", highlight_role_t::command},
{L"\"before", highlight_role_t::quote},

3
src/parse_constants.h
View file

@ -262,9 +262,6 @@ enum class pipeline_position_t {
/// Error issued on $@.
#define ERROR_NOT_ARGV_AT _(L"$@ is not supported. In fish, please use $argv.")
/// Error issued on $(...).
#define ERROR_BAD_VAR_SUBCOMMAND1 _(L"$(...) is not supported. In fish, please use '(%ls)'.")
/// Error issued on $*.
#define ERROR_NOT_ARGV_STAR _(L"$* is not supported. In fish, please use $argv.")

62
src/parse_util.cpp
View file

@ -915,26 +915,6 @@ void parse_util_expand_variable_error(const wcstring &token, size_t global_token
append_syntax_error(errors, global_dollar_pos, ERROR_NO_VAR_NAME);
break;
}
case '(': {
// e.g.: 'echo "foo$(bar)baz"
// Try to determine what's in the parens.
wcstring token_after_parens;
wcstring paren_text;
size_t open_parens = dollar_pos + 1, cmdsub_start = 0, cmdsub_end = 0;
if (parse_util_locate_cmdsubst_range(token, &open_parens, &paren_text, &cmdsub_start,
&cmdsub_end, true) > 0) {
token_after_parens = tok_first(paren_text);
}
// Make sure we always show something.
if (token_after_parens.empty()) {
token_after_parens = get_ellipsis_str();
}
append_syntax_error(errors, global_dollar_pos, ERROR_BAD_VAR_SUBCOMMAND1,
truncate(token_after_parens, var_err_len).c_str());
break;
}
case L'\0': {
append_syntax_error(errors, global_dollar_pos, ERROR_NO_VAR_NAME);
break;
@ -960,39 +940,6 @@ void parse_util_expand_variable_error(const wcstring &token, size_t global_token
assert(errors->size() == start_error_count + 1);
}
/// Detect cases like $(abc). Given an arg like foo(bar), let arg_src be foo and cmdsubst_src be
/// bar. If arg ends with VARIABLE_EXPAND, then report an error.
static parser_test_error_bits_t detect_dollar_cmdsub_errors(size_t arg_src_offset,
const wcstring &arg_src,
const wcstring &cmdsubst_src,
parse_error_list_t *out_errors) {
parser_test_error_bits_t result_bits = 0;
wcstring unescaped_arg_src;
if (!unescape_string(arg_src, &unescaped_arg_src, UNESCAPE_SPECIAL) ||
unescaped_arg_src.empty()) {
return result_bits;
}
wchar_t last = unescaped_arg_src.at(unescaped_arg_src.size() - 1);
if (last == VARIABLE_EXPAND) {
result_bits |= PARSER_TEST_ERROR;
if (out_errors != nullptr) {
wcstring subcommand_first_token = tok_first(cmdsubst_src);
if (subcommand_first_token.empty()) {
// e.g. $(). Report somthing.
subcommand_first_token = get_ellipsis_str();
}
append_syntax_error(
out_errors,
arg_src_offset + arg_src.size() - 1, // global position of the dollar
ERROR_BAD_VAR_SUBCOMMAND1, truncate(subcommand_first_token, var_err_len).c_str());
}
}
return result_bits;
}
/// Test if this argument contains any errors. Detected errors include syntax errors in command
/// substitutions, improperly escaped characters and improper use of the variable expansion
/// operator.
@ -1038,15 +985,6 @@ parser_test_error_bits_t parse_util_detect_errors_in_argument(const ast::argumen
if (out_errors != nullptr) {
out_errors->insert(out_errors->end(), subst_errors.begin(), subst_errors.end());
// Hackish. Take this opportunity to report $(...) errors. We do this because
// after we've replaced with internal separators, we can't distinguish between
// "" and (), and also we no longer have the source of the command substitution.
// As an optimization, this is only necessary if the last character is a $.
if (paren_begin > 0 && arg_src.at(paren_begin - 1) == L'$') {
err |= detect_dollar_cmdsub_errors(
source_start, arg_src.substr(0, paren_begin), subst, out_errors);
}
}
break;
}

3
tests/checks/cmdsub.fish
View file

@ -1,5 +1,8 @@
#RUN: %fish %s
echo $(echo 1\n2)
# CHECK: 1 2
# Command substitution inside double quotes strips trailing newline.
echo "a$(echo b)c"
# CHECK: abc

3
tests/history_sample_bash
View file

@ -15,7 +15,8 @@ backticks `are not allowed`
a && echo valid construct
[[ x = y ]] && echo double brackets not allowed
(( 1 = 2 )) && echo double parens not allowed
posix_cmd_sub $(is not supported)
posix_cmd_sub "$(is supported)"
posix_cmd_sub $(is supported but only splits on newlines)
sleep 123
/** # see issue 7407
jq <<"EOF"