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4506 lines (3829 loc) · 118 KB
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/** \file builtin.c
Functions for executing builtin functions.
How to add a new builtin function:
1). Create a function in builtin.c with the following signature:
<tt>static int builtin_NAME( parser_t &parser, wchar_t ** args )</tt>
where NAME is the name of the builtin, and args is a zero-terminated list of arguments.
2). Add a line like { L"NAME", &builtin_NAME, N_(L"Bla bla bla") }, to the builtin_data_t variable. The description is used by the completion system. Note that this array is sorted!
3). Create a file doc_src/NAME.txt, containing the manual for the builtin in Doxygen-format. Check the other builtin manuals for proper syntax.
4). Use 'git add doc_src/NAME.txt' to start tracking changes to the documentation file.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <unistd.h>
#include <termios.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <signal.h>
#include <wctype.h>
#include <sys/time.h>
#include <time.h>
#include <stack>
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "builtin.h"
#include "function.h"
#include "complete.h"
#include "proc.h"
#include "parser.h"
#include "reader.h"
#include "env.h"
#include "common.h"
#include "wgetopt.h"
#include "sanity.h"
#include "tokenizer.h"
#include "wildcard.h"
#include "input_common.h"
#include "input.h"
#include "intern.h"
#include "event.h"
#include "signal.h"
#include "exec.h"
#include "highlight.h"
#include "parse_util.h"
#include "parser_keywords.h"
#include "expand.h"
#include "path.h"
#include "history.h"
#include "parse_tree.h"
/**
The default prompt for the read command
*/
#define DEFAULT_READ_PROMPT L"set_color green; echo -n read; set_color normal; echo -n \"> \""
/**
The mode name to pass to history and input
*/
#define READ_MODE_NAME L"fish_read"
/**
The send stuff to foreground message
*/
#define FG_MSG _( L"Send job %d, '%ls' to foreground\n" )
/**
Datastructure to describe a builtin.
*/
struct builtin_data_t
{
/**
Name of the builtin
*/
const wchar_t *name;
/**
Function pointer tothe builtin implementation
*/
int (*func)(parser_t &parser, wchar_t **argv);
/**
Description of what the builtin does
*/
const wchar_t *desc;
bool operator<(const wcstring &) const;
bool operator<(const builtin_data_t *) const;
};
bool builtin_data_t::operator<(const wcstring &other) const
{
return wcscmp(this->name, other.c_str()) < 0;
}
bool builtin_data_t::operator<(const builtin_data_t *other) const
{
return wcscmp(this->name, other->name) < 0;
}
int builtin_out_redirect;
int builtin_err_redirect;
/* Buffers for storing the output of builtin functions */
wcstring stdout_buffer, stderr_buffer;
const wcstring &get_stdout_buffer()
{
ASSERT_IS_MAIN_THREAD();
return stdout_buffer;
}
const wcstring &get_stderr_buffer()
{
ASSERT_IS_MAIN_THREAD();
return stderr_buffer;
}
void builtin_show_error(const wcstring &err)
{
ASSERT_IS_MAIN_THREAD();
stderr_buffer.append(err);
}
/**
Stack containing builtin I/O for recursive builtin calls.
*/
struct io_stack_elem_t
{
int in;
wcstring out;
wcstring err;
};
static std::stack<io_stack_elem_t, std::vector<io_stack_elem_t> > io_stack;
/**
The file from which builtin functions should attempt to read, use
instead of stdin.
*/
static int builtin_stdin;
/**
The underlying IO redirections behind the current builtin. This
should normally not be used - sb_out and friends are already
configured to handle everything.
*/
static const io_chain_t *real_io;
/**
Counts the number of non null pointers in the specified array
*/
static int builtin_count_args(const wchar_t * const * argv)
{
int argc = 1;
while (argv[argc] != NULL)
{
argc++;
}
return argc;
}
/**
This function works like wperror, but it prints its result into
the sb_err string instead of to stderr. Used by the builtin
commands.
*/
static void builtin_wperror(const wchar_t *s)
{
if (s != 0)
{
stderr_buffer.append(s);
stderr_buffer.append(L": ");
}
char *err = strerror(errno);
if (err)
{
const wcstring werr = str2wcstring(err);
stderr_buffer.append(werr);
stderr_buffer.push_back(L'\n');
}
}
/**
Count the number of times the specified character occurs in the specified string
*/
static int count_char(const wchar_t *str, wchar_t c)
{
int res = 0;
for (; *str; str++)
{
res += (*str==c);
}
return res;
}
wcstring builtin_help_get(parser_t &parser, const wchar_t *name)
{
/* This won't ever work if no_exec is set */
if (no_exec)
return wcstring();
wcstring_list_t lst;
wcstring out;
const wcstring name_esc = escape_string(name, 1);
const wcstring cmd = format_string(L"__fish_print_help %ls", name_esc.c_str());
if (exec_subshell(cmd, lst, false /* don't apply exit status */) >= 0)
{
for (size_t i=0; i<lst.size(); i++)
{
out.append(lst.at(i));
out.push_back(L'\n');
}
}
return out;
}
/**
Print help for the specified builtin. If \c b is sb_err, also print
the line information
If \c b is the buffer representing standard error, and the help
message is about to be printed to an interactive screen, it may be
shortened to fit the screen.
*/
static void builtin_print_help(parser_t &parser, const wchar_t *cmd, wcstring &b)
{
if (&b == &stderr_buffer)
{
stderr_buffer.append(parser.current_line());
}
const wcstring h = builtin_help_get(parser, cmd);
if (!h.size())
return;
wchar_t *str = wcsdup(h.c_str());
if (str)
{
bool is_short = false;
if (&b == &stderr_buffer)
{
/*
Interactive mode help to screen - only print synopsis if
the rest won't fit
*/
int screen_height, lines;
screen_height = common_get_height();
lines = count_char(str, L'\n');
if (!get_is_interactive() || (lines > 2*screen_height/3))
{
wchar_t *pos;
int cut=0;
int i;
is_short = true;
/*
First move down 4 lines
*/
pos = str;
for (i=0; (i<4) && pos && *pos; i++)
{
pos = wcschr(pos+1, L'\n');
}
if (pos && *pos)
{
/*
Then find the next empty line
*/
for (; *pos; pos++)
{
if (*pos == L'\n')
{
wchar_t *pos2;
int is_empty = 1;
for (pos2 = pos+1; *pos2; pos2++)
{
if (*pos2 == L'\n')
break;
if (*pos2 != L'\t' && *pos2 !=L' ')
{
is_empty = 0;
break;
}
}
if (is_empty)
{
/*
And cut it
*/
*(pos2+1)=L'\0';
cut = 1;
break;
}
}
}
}
/*
We did not find a good place to cut message to
shorten it - so we make sure we don't print
anything.
*/
if (!cut)
{
*str = 0;
}
}
}
b.append(str);
if (is_short)
{
append_format(b, _(L"%ls: Type 'help %ls' for related documentation\n\n"), cmd, cmd);
}
free(str);
}
}
/**
Perform error reporting for encounter with unknown option
*/
static void builtin_unknown_option(parser_t &parser, const wchar_t *cmd, const wchar_t *opt)
{
append_format(stderr_buffer, BUILTIN_ERR_UNKNOWN, cmd, opt);
builtin_print_help(parser, cmd, stderr_buffer);
}
/**
Perform error reporting for encounter with missing argument
*/
static void builtin_missing_argument(parser_t &parser, const wchar_t *cmd, const wchar_t *opt)
{
append_format(stderr_buffer, BUILTIN_ERR_MISSING, cmd, opt);
builtin_print_help(parser, cmd, stderr_buffer);
}
/*
Here follows the definition of all builtin commands. The function
names are all on the form builtin_NAME where NAME is the name of the
builtin. so the function name for the builtin 'fg' is
'builtin_fg'.
A few builtins, including 'while', 'command' and 'builtin' are not
defined here as they are handled directly by the parser. (They are
not parsed as commands, instead they only alter the parser state)
The builtins 'break' and 'continue' are so closely related that they
share the same implementation, namely 'builtin_break_continue.
Several other builtins, including jobs, ulimit and set are so big
that they have been given their own file. These files are all named
'builtin_NAME.c', where NAME is the name of the builtin. These files
are included directly below.
*/
#include "builtin_set.cpp"
#include "builtin_commandline.cpp"
#include "builtin_complete.cpp"
#include "builtin_ulimit.cpp"
#include "builtin_jobs.cpp"
#include "builtin_set_color.cpp"
#include "builtin_printf.cpp"
/* builtin_test lives in builtin_test.cpp */
int builtin_test(parser_t &parser, wchar_t **argv);
/**
List all current key bindings
*/
static void builtin_bind_list()
{
size_t i;
wcstring_list_t lst;
input_mapping_get_names(lst);
for (i=0; i<lst.size(); i++)
{
wcstring seq = lst.at(i);
wcstring ecmd;
input_mapping_get(seq, ecmd);
ecmd = escape_string(ecmd, 1);
wcstring tname;
if (input_terminfo_get_name(seq, tname))
{
append_format(stdout_buffer, L"bind -k %ls %ls\n", tname.c_str(), ecmd.c_str());
}
else
{
const wcstring eseq = escape_string(seq, 1);
append_format(stdout_buffer, L"bind %ls %ls\n", eseq.c_str(), ecmd.c_str());
}
}
}
/**
Print terminfo key binding names to string buffer used for standard output.
\param all if set, all terminfo key binding names will be
printed. If not set, only ones that are defined for this terminal
are printed.
*/
static void builtin_bind_key_names(int all)
{
const wcstring_list_t names = input_terminfo_get_names(!all);
for (size_t i=0; i<names.size(); i++)
{
const wcstring &name = names.at(i);
append_format(stdout_buffer, L"%ls\n", name.c_str());
}
}
/**
Print all the special key binding functions to string buffer used for standard output.
*/
static void builtin_bind_function_names()
{
wcstring_list_t names = input_function_get_names();
for (size_t i=0; i<names.size(); i++)
{
const wchar_t *seq = names.at(i).c_str();
append_format(stdout_buffer, L"%ls\n", seq);
}
}
/**
Add specified key binding.
*/
static int builtin_bind_add(const wchar_t *seq, const wchar_t *cmd, int terminfo)
{
if (terminfo)
{
wcstring seq2;
if (input_terminfo_get_sequence(seq, &seq2))
{
input_mapping_add(seq2.c_str(), cmd);
}
else
{
switch (errno)
{
case ENOENT:
{
append_format(stderr_buffer, _(L"%ls: No key with name '%ls' found\n"), L"bind", seq);
break;
}
case EILSEQ:
{
append_format(stderr_buffer, _(L"%ls: Key with name '%ls' does not have any mapping\n"), L"bind", seq);
break;
}
default:
{
append_format(stderr_buffer, _(L"%ls: Unknown error trying to bind to key named '%ls'\n"), L"bind", seq);
break;
}
}
return 1;
}
}
else
{
input_mapping_add(seq, cmd);
}
return 0;
}
/**
Erase specified key bindings
\param seq an array of all key bindings to erase
\param all if specified, _all_ key bindings will be erased
*/
static void builtin_bind_erase(wchar_t **seq, int all)
{
if (all)
{
size_t i;
wcstring_list_t lst;
input_mapping_get_names(lst);
for (i=0; i<lst.size(); i++)
{
input_mapping_erase(lst.at(i).c_str());
}
}
else
{
while (*seq)
{
input_mapping_erase(*seq++);
}
}
}
/**
The bind builtin, used for setting character sequences
*/
static int builtin_bind(parser_t &parser, wchar_t **argv)
{
enum
{
BIND_INSERT,
BIND_ERASE,
BIND_KEY_NAMES,
BIND_FUNCTION_NAMES
}
;
int argc=builtin_count_args(argv);
int mode = BIND_INSERT;
int res = STATUS_BUILTIN_OK;
int all = 0;
int use_terminfo = 0;
woptind=0;
static const struct woption
long_options[] =
{
{ L"all", no_argument, 0, 'a' },
{ L"erase", no_argument, 0, 'e' },
{ L"function-names", no_argument, 0, 'f' },
{ L"help", no_argument, 0, 'h' },
{ L"key", no_argument, 0, 'k' },
{ L"key-names", no_argument, 0, 'K' },
{ 0, 0, 0, 0 }
};
while (1)
{
int opt_index = 0;
int opt = wgetopt_long(argc,
argv,
L"aehkKf",
long_options,
&opt_index);
if (opt == -1)
break;
switch (opt)
{
case 0:
if (long_options[opt_index].flag != 0)
break;
append_format(stderr_buffer,
BUILTIN_ERR_UNKNOWN,
argv[0],
long_options[opt_index].name);
builtin_print_help(parser, argv[0], stderr_buffer);
return STATUS_BUILTIN_ERROR;
case 'a':
all = 1;
break;
case 'e':
mode = BIND_ERASE;
break;
case 'h':
builtin_print_help(parser, argv[0], stdout_buffer);
return STATUS_BUILTIN_OK;
case 'k':
use_terminfo = 1;
break;
case 'K':
mode = BIND_KEY_NAMES;
break;
case 'f':
mode = BIND_FUNCTION_NAMES;
break;
case '?':
builtin_unknown_option(parser, argv[0], argv[woptind-1]);
return STATUS_BUILTIN_ERROR;
}
}
switch (mode)
{
case BIND_ERASE:
{
builtin_bind_erase(&argv[woptind], all);
break;
}
case BIND_INSERT:
{
switch (argc-woptind)
{
case 0:
{
builtin_bind_list();
break;
}
case 2:
{
builtin_bind_add(argv[woptind], argv[woptind+1], use_terminfo);
break;
}
default:
{
res = STATUS_BUILTIN_ERROR;
append_format(stderr_buffer, _(L"%ls: Expected zero or two parameters, got %d\n"), argv[0], argc-woptind);
break;
}
}
break;
}
case BIND_KEY_NAMES:
{
builtin_bind_key_names(all);
break;
}
case BIND_FUNCTION_NAMES:
{
builtin_bind_function_names();
break;
}
default:
{
res = STATUS_BUILTIN_ERROR;
append_format(stderr_buffer, _(L"%ls: Invalid state\n"), argv[0]);
break;
}
}
return res;
}
/**
The block builtin, used for temporarily blocking events
*/
static int builtin_block(parser_t &parser, wchar_t **argv)
{
enum
{
UNSET,
GLOBAL,
LOCAL,
}
;
int scope=UNSET;
int erase = 0;
int argc=builtin_count_args(argv);
woptind=0;
static const struct woption
long_options[] =
{
{
L"erase", no_argument, 0, 'e'
}
,
{
L"local", no_argument, 0, 'l'
}
,
{
L"global", no_argument, 0, 'g'
}
,
{
L"help", no_argument, 0, 'h'
}
,
{
0, 0, 0, 0
}
}
;
while (1)
{
int opt_index = 0;
int opt = wgetopt_long(argc,
argv,
L"elgh",
long_options,
&opt_index);
if (opt == -1)
break;
switch (opt)
{
case 0:
if (long_options[opt_index].flag != 0)
break;
append_format(stderr_buffer,
BUILTIN_ERR_UNKNOWN,
argv[0],
long_options[opt_index].name);
builtin_print_help(parser, argv[0], stderr_buffer);
return STATUS_BUILTIN_ERROR;
case 'h':
builtin_print_help(parser, argv[0], stdout_buffer);
return STATUS_BUILTIN_OK;
case 'g':
scope = GLOBAL;
break;
case 'l':
scope = LOCAL;
break;
case 'e':
erase = 1;
break;
case '?':
builtin_unknown_option(parser, argv[0], argv[woptind-1]);
return STATUS_BUILTIN_ERROR;
}
}
if (erase)
{
if (scope != UNSET)
{
append_format(stderr_buffer, _(L"%ls: Can not specify scope when removing block\n"), argv[0]);
return STATUS_BUILTIN_ERROR;
}
if (parser.global_event_blocks.empty())
{
append_format(stderr_buffer, _(L"%ls: No blocks defined\n"), argv[0]);
return STATUS_BUILTIN_ERROR;
}
parser.global_event_blocks.pop_front();
}
else
{
size_t block_idx = 0;
block_t *block = parser.block_at_index(block_idx);
event_blockage_t eb = {};
eb.typemask = (1<<EVENT_ANY);
switch (scope)
{
case LOCAL:
{
// If this is the outermost block, then we're global
if (block_idx + 1 >= parser.block_count())
{
block = NULL;
}
break;
}
case GLOBAL:
{
block=NULL;
}
case UNSET:
{
while (block != NULL && block->type() != FUNCTION_CALL && block->type() != FUNCTION_CALL_NO_SHADOW)
{
// Set it in function scope
block = parser.block_at_index(++block_idx);
}
}
}
if (block)
{
block->event_blocks.push_front(eb);
}
else
{
parser.global_event_blocks.push_front(eb);
}
}
return STATUS_BUILTIN_OK;
}
/**
The builtin builtin, used for giving builtins precedence over
functions. Mostly handled by the parser. All this code does is some
additional operational modes, such as printing a list of all
builtins, printing help, etc.
*/
static int builtin_builtin(parser_t &parser, wchar_t **argv)
{
int argc=builtin_count_args(argv);
int list=0;
woptind=0;
static const struct woption
long_options[] =
{
{
L"names", no_argument, 0, 'n'
}
,
{
L"help", no_argument, 0, 'h'
}
,
{
0, 0, 0, 0
}
}
;
while (1)
{
int opt_index = 0;
int opt = wgetopt_long(argc,
argv,
L"nh",
long_options,
&opt_index);
if (opt == -1)
break;
switch (opt)
{
case 0:
if (long_options[opt_index].flag != 0)
break;
append_format(stderr_buffer,
BUILTIN_ERR_UNKNOWN,
argv[0],
long_options[opt_index].name);
builtin_print_help(parser, argv[0], stderr_buffer);
return STATUS_BUILTIN_ERROR;
case 'h':
builtin_print_help(parser, argv[0], stdout_buffer);
return STATUS_BUILTIN_OK;
case 'n':
list=1;
break;
case '?':
builtin_unknown_option(parser, argv[0], argv[woptind-1]);
return STATUS_BUILTIN_ERROR;
}
}
if (list)
{
wcstring_list_t names = builtin_get_names();
sort(names.begin(), names.end());
for (size_t i=0; i<names.size(); i++)
{
const wchar_t *el = names.at(i).c_str();
stdout_buffer.append(el);
stdout_buffer.append(L"\n");
}
}
return STATUS_BUILTIN_OK;
}
/**
Implementation of the builtin emit command, used to create events.
*/
static int builtin_emit(parser_t &parser, wchar_t **argv)
{
int argc=builtin_count_args(argv);
woptind=0;
static const struct woption
long_options[] =
{
{
L"help", no_argument, 0, 'h'
}
,
{
0, 0, 0, 0
}
}
;
while (1)
{
int opt_index = 0;
int opt = wgetopt_long(argc,
argv,
L"h",
long_options,
&opt_index);
if (opt == -1)
break;
switch (opt)
{
case 0:
if (long_options[opt_index].flag != 0)
break;
append_format(stderr_buffer,
BUILTIN_ERR_UNKNOWN,
argv[0],
long_options[opt_index].name);
builtin_print_help(parser, argv[0], stderr_buffer);
return STATUS_BUILTIN_ERROR;
case 'h':
builtin_print_help(parser, argv[0], stdout_buffer);
return STATUS_BUILTIN_OK;
case '?':
builtin_unknown_option(parser, argv[0], argv[woptind-1]);
return STATUS_BUILTIN_ERROR;
}
}
if (!argv[woptind])
{