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implement argparse --max-args N --min-args N

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Fixes #4190
This commit is contained in:
Kurtis Rader 2017-07-11 17:15:11 -07:00
parent e260c42a13
commit 9adf500cf3
2 changed files with 35 additions and 1 deletions
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2
src/builtin.h
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@ -53,6 +53,8 @@ enum { COMMAND_NOT_BUILTIN, BUILTIN_REGULAR, BUILTIN_FUNCTION };
/// Error message for unexpected args.
#define BUILTIN_ERR_ARG_COUNT1 _(L"%ls: expected %d args, got %d\n")
#define BUILTIN_ERR_ARG_COUNT2 _(L"%ls: %ls expected %d args, got %d\n")
#define BUILTIN_ERR_MIN_ARG_COUNT1 _(L"%ls: Expected at least %d args, got only %d\n")
#define BUILTIN_ERR_MAX_ARG_COUNT1 _(L"%ls: Expected at most %d args, got %d\n")
/// Error message for invalid variable name.
#define BUILTIN_ERR_VARNAME _(L"%ls: Variable name '%ls' is not valid. See `help identifiers`.\n")

34
src/builtin_argparse.cpp
View file

@ -50,6 +50,8 @@ class argparse_cmd_opts_t {
public:
bool print_help = false;
bool require_order = false;
size_t min_args = 0;
size_t max_args = SIZE_T_MAX;
wcstring name = L"argparse";
wcstring_list_t raw_exclusive_flags;
wcstring_list_t argv;
@ -64,11 +66,13 @@ class argparse_cmd_opts_t {
}
};
static const wchar_t *short_options = L"+:hn:rx:";
static const wchar_t *short_options = L"+:hn:rx:N:X:";
static const struct woption long_options[] = {{L"require-order", no_argument, NULL, 'r'},
{L"name", required_argument, NULL, 'n'},
{L"exclusive", required_argument, NULL, 'x'},
{L"help", no_argument, NULL, 'h'},
{L"min-args", required_argument, NULL, 'N'},
{L"max-args", required_argument, NULL, 'X'},
{NULL, 0, NULL, 0}};
// Check if any pair of mutually exclusive options was seen. Note that since every option must have
@ -273,6 +277,26 @@ static int parse_cmd_opts(argparse_cmd_opts_t &opts, int *optind, //!OCLINT(hig
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]);
return STATUS_INVALID_ARGS;
@ -404,6 +428,14 @@ static int argparse_parse_args(argparse_cmd_opts_t &opts, const wcstring_list_t
update_bool_flag_counts(opts);
for (int i = optind; argv[i]; i++) opts.argv.push_back(argv[i]);
if (opts.min_args > 0 && 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_T_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;
}