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fish-shell/src/builtin_function.cpp
David Adam 21890ccac7 function: restore '%self' functionality for --on-process-exit 
One key use of process expansion, used in currently-shipped code, is for running a function on
current shell exit.

Restore the use of %self as a valid argument (and add `self`) and document this change.

(faho: Remove bare "self")
2018-05-08 11:17:07 +02:00

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// Implementation of the function builtin.
#include "config.h" // IWYU pragma: keep
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <vector>
#include "builtin.h"
#include "builtin_function.h"
#include "common.h"
#include "complete.h"
#include "event.h"
#include "fallback.h" // IWYU pragma: keep
#include "function.h"
#include "io.h"
#include "parser.h"
#include "parser_keywords.h"
#include "proc.h"
#include "signal.h"
#include "wgetopt.h"
#include "wutil.h" // IWYU pragma: keep
struct function_cmd_opts_t {
bool print_help = false;
bool shadow_scope = true;
wcstring description = L"";
std::vector<event_t> events;
wcstring_list_t named_arguments;
wcstring_list_t inherit_vars;
wcstring_list_t wrap_targets;
};
// This command is atypical in using the "+" (REQUIRE_ORDER) option for flag parsing.
// This is needed due to the semantics of the -a/--argument-names flag.
static const wchar_t *short_options = L"+:a:d:e:hj:p:s:v:w:SV:";
static const struct woption long_options[] = {{L"description", required_argument, NULL, 'd'},
{L"on-signal", required_argument, NULL, 's'},
{L"on-job-exit", required_argument, NULL, 'j'},
{L"on-process-exit", required_argument, NULL, 'p'},
{L"on-variable", required_argument, NULL, 'v'},
{L"on-event", required_argument, NULL, 'e'},
{L"wraps", required_argument, NULL, 'w'},
{L"help", no_argument, NULL, 'h'},
{L"argument-names", required_argument, NULL, 'a'},
{L"no-scope-shadowing", no_argument, NULL, 'S'},
{L"inherit-variable", required_argument, NULL, 'V'},
{NULL, 0, NULL, 0}};
static int parse_cmd_opts(function_cmd_opts_t &opts, int *optind, //!OCLINT(high ncss method)
int argc, wchar_t **argv, parser_t &parser, io_streams_t &streams) {
const wchar_t *cmd = L"function";
int opt;
wgetopter_t w;
while ((opt = w.wgetopt_long(argc, argv, short_options, long_options, NULL)) != -1) {
switch (opt) {
case 'd': {
opts.description = w.woptarg;
break;
}
case 's': {
int sig = wcs2sig(w.woptarg);
if (sig == -1) {
streams.err.append_format(_(L"%ls: Unknown signal '%ls'"), cmd, w.woptarg);
return STATUS_INVALID_ARGS;
}
opts.events.push_back(event_t::signal_event(sig));
break;
}
case 'v': {
if (!valid_var_name(w.woptarg)) {
streams.err.append_format(BUILTIN_ERR_VARNAME, cmd, w.woptarg);
return STATUS_INVALID_ARGS;
}
opts.events.push_back(event_t::variable_event(w.woptarg));
break;
}
case 'e': {
opts.events.push_back(event_t::generic_event(w.woptarg));
break;
}
case 'j':
case 'p': {
pid_t pid;
event_t e(EVENT_ANY);
if ((opt == 'j') && (wcscasecmp(w.woptarg, L"caller") == 0)) {
job_id_t job_id = -1;
if (is_subshell) {
size_t block_idx = 0;
// Find the outermost substitution block.
for (block_idx = 0;; block_idx++) {
const block_t *b = parser.block_at_index(block_idx);
if (b == NULL || b->type() == SUBST) break;
}
// Go one step beyond that, to get to the caller.
const block_t *caller_block = parser.block_at_index(block_idx + 1);
if (caller_block != NULL && caller_block->job != NULL) {
job_id = caller_block->job->job_id;
}
}
if (job_id == -1) {
streams.err.append_format(
_(L"%ls: Cannot find calling job for event handler"), cmd);
return STATUS_INVALID_ARGS;
}
e.type = EVENT_JOB_ID;
e.param1.job_id = job_id;
} else if ((opt == 'p') && (wcscasecmp(w.woptarg, L"%self") == 0)) {
pid = getpid();
e.type = EVENT_EXIT;
e.param1.pid = pid;
} else {
pid = fish_wcstoi(w.woptarg);
if (errno || pid < 0) {
streams.err.append_format(_(L"%ls: Invalid process id '%ls'"), cmd,
w.woptarg);
return STATUS_INVALID_ARGS;
}
e.type = EVENT_EXIT;
e.param1.pid = (opt == 'j' ? -1 : 1) * abs(pid);
}
opts.events.push_back(e);
break;
}
case 'a': {
opts.named_arguments.push_back(w.woptarg);
break;
}
case 'S': {
opts.shadow_scope = false;
break;
}
case 'w': {
opts.wrap_targets.push_back(w.woptarg);
break;
}
case 'V': {
if (!valid_var_name(w.woptarg)) {
streams.err.append_format(BUILTIN_ERR_VARNAME, cmd, w.woptarg);
return STATUS_INVALID_ARGS;
}
opts.inherit_vars.push_back(w.woptarg);
break;
}
case 'h': {
opts.print_help = true;
break;
}
case ':': {
builtin_missing_argument(parser, streams, cmd, argv[w.woptind - 1]);
return STATUS_INVALID_ARGS;
}
case '?': {
builtin_unknown_option(parser, streams, cmd, argv[w.woptind - 1]);
return STATUS_INVALID_ARGS;
}
default: {
DIE("unexpected retval from wgetopt_long");
break;
}
}
}
*optind = w.woptind;
return STATUS_CMD_OK;
}
static int validate_function_name(int argc, const wchar_t *const *argv, wcstring &function_name,
const wchar_t *cmd, io_streams_t &streams) {
if (argc < 2) {
// This is currently impossible but let's be paranoid.
streams.err.append_format(_(L"%ls: Expected function name"), cmd);
return STATUS_INVALID_ARGS;
}
function_name = argv[1];
if (!valid_func_name(function_name)) {
streams.err.append_format(_(L"%ls: Illegal function name '%ls'"), cmd,
function_name.c_str());
return STATUS_INVALID_ARGS;
}
if (parser_keywords_is_reserved(function_name)) {
streams.err.append_format(
_(L"%ls: The name '%ls' is reserved,\nand can not be used as a function name"), cmd,
function_name.c_str());
return STATUS_INVALID_ARGS;
}
return STATUS_CMD_OK;
}
/// Define a function. Calls into `function.cpp` to perform the heavy lifting of defining a
/// function.
int builtin_function(parser_t &parser, io_streams_t &streams, const wcstring_list_t &c_args,
const parsed_source_ref_t &source, tnode_t<grammar::job_list> body) {
assert(source && "Missing source in builtin_function");
// The wgetopt function expects 'function' as the first argument. Make a new wcstring_list with
// that property. This is needed because this builtin has a different signature than the other
// builtins.
wcstring_list_t args = {L"function"};
args.insert(args.end(), c_args.begin(), c_args.end());
// Hackish const_cast matches the one in builtin_run.
const null_terminated_array_t<wchar_t> argv_array(args);
wchar_t **argv = const_cast<wchar_t **>(argv_array.get());
wchar_t *cmd = argv[0];
int argc = builtin_count_args(argv);
// A valid function name has to be the first argument.
wcstring function_name;
int retval = validate_function_name(argc, argv, function_name, cmd, streams);
if (retval != STATUS_CMD_OK) return retval;
argv++;
argc--;
function_cmd_opts_t opts;
int optind;
retval = parse_cmd_opts(opts, &optind, argc, argv, parser, streams);
if (retval != STATUS_CMD_OK) return retval;
if (opts.print_help) {
builtin_print_help(parser, streams, cmd, streams.err);
return STATUS_CMD_OK;
}
if (argc != optind) {
if (opts.named_arguments.size()) {
for (int i = optind; i < argc; i++) {
opts.named_arguments.push_back(argv[i]);
}
} else {
streams.err.append_format(_(L"%ls: Unexpected positional argument '%ls'"), cmd,
argv[optind]);
return STATUS_INVALID_ARGS;
}
}
// We have what we need to actually define the function.
function_data_t d;
d.name = function_name;
if (!opts.description.empty()) d.description = opts.description;
// d.description = opts.description;
d.events.swap(opts.events);
d.props.shadow_scope = opts.shadow_scope;
d.props.named_arguments = std::move(opts.named_arguments);
d.inherit_vars = std::move(opts.inherit_vars);
for (size_t i = 0; i < d.events.size(); i++) {
event_t &e = d.events.at(i);
e.function_name = d.name;
}
d.props.parsed_source = source;
d.props.body_node = body;
function_add(std::move(d), parser);
// Handle wrap targets by creating the appropriate completions.
for (const wcstring &wt : opts.wrap_targets) complete_add_wrapper(function_name, wt);
return STATUS_CMD_OK;
}
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