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bashline.c
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/* bashline.c -- Bash's interface to the readline library. */
/* Copyright (C) 1987-2006 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Bash is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with Bash; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#include "config.h"
#if defined (READLINE)
#include "bashtypes.h"
#include "posixstat.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#if defined (HAVE_GRP_H)
# include <grp.h>
#endif
#if defined (HAVE_NETDB_H)
# include <netdb.h>
#endif
#include <stdio.h>
#include "chartypes.h"
#include "bashansi.h"
#include "bashintl.h"
#include "shell.h"
#include "input.h"
#include "builtins.h"
#include "bashhist.h"
#include "bashline.h"
#include "execute_cmd.h"
#include "findcmd.h"
#include "pathexp.h"
#include "builtins/common.h"
#include <readline/rlconf.h>
#include <readline/readline.h>
#include <readline/history.h>
#include <glob/glob.h>
#if defined (ALIAS)
# include "alias.h"
#endif
#if defined (PROGRAMMABLE_COMPLETION)
# include "pcomplete.h"
#endif
/* These should agree with the defines for emacs_mode and vi_mode in
rldefs.h, even though that's not a public readline header file. */
#ifndef EMACS_EDITING_MODE
# define NO_EDITING_MODE -1
# define EMACS_EDITING_MODE 1
# define VI_EDITING_MODE 0
#endif
#if defined (BRACE_COMPLETION)
extern int bash_brace_completion __P((int, int));
#endif /* BRACE_COMPLETION */
/* Forward declarations */
/* Functions bound to keys in Readline for Bash users. */
static int shell_expand_line __P((int, int));
static int display_shell_version __P((int, int));
static int operate_and_get_next __P((int, int));
static int bash_ignore_filenames __P((char **));
static int bash_ignore_everything __P((char **));
#if defined (BANG_HISTORY)
static char *history_expand_line_internal __P((char *));
static int history_expand_line __P((int, int));
static int tcsh_magic_space __P((int, int));
#endif /* BANG_HISTORY */
#ifdef ALIAS
static int alias_expand_line __P((int, int));
#endif
#if defined (BANG_HISTORY) && defined (ALIAS)
static int history_and_alias_expand_line __P((int, int));
#endif
/* Helper functions for Readline. */
static void bash_directory_expansion __P((char **));
static int bash_directory_completion_hook __P((char **));
static int filename_completion_ignore __P((char **));
static int bash_push_line __P((void));
static void cleanup_expansion_error __P((void));
static void maybe_make_readline_line __P((char *));
static void set_up_new_line __P((char *));
static int check_redir __P((int));
static char **attempt_shell_completion __P((const char *, int, int));
static char *variable_completion_function __P((const char *, int));
static char *hostname_completion_function __P((const char *, int));
static char *command_subst_completion_function __P((const char *, int));
static void build_history_completion_array __P((void));
static char *history_completion_generator __P((const char *, int));
static int dynamic_complete_history __P((int, int));
static void initialize_hostname_list __P((void));
static void add_host_name __P((char *));
static void snarf_hosts_from_file __P((char *));
static char **hostnames_matching __P((char *));
static void _ignore_completion_names __P((char **, sh_ignore_func_t *));
static int name_is_acceptable __P((const char *));
static int test_for_directory __P((const char *));
static int return_zero __P((const char *));
static char *bash_dequote_filename __P((char *, int));
static char *quote_word_break_chars __P((char *));
static char *bash_quote_filename __P((char *, int, char *));
static int bash_execute_unix_command __P((int, int));
static void init_unix_command_map __P((void));
static int isolate_sequence __P((char *, int, int, int *));
static int set_saved_history __P((void));
#if defined (ALIAS)
static int posix_edit_macros __P((int, int));
#endif
#if defined (PROGRAMMABLE_COMPLETION)
static int find_cmd_start __P((int));
static int find_cmd_end __P((int));
static char *find_cmd_name __P((int));
static char *prog_complete_return __P((const char *, int));
static char **prog_complete_matches;
#endif
/* Variables used here but defined in other files. */
#if defined (BANG_HISTORY)
extern int hist_verify;
#endif
extern int current_command_line_count, last_command_exit_value;
extern int posixly_correct, no_symbolic_links;
extern char *current_prompt_string, *ps1_prompt;
extern STRING_INT_ALIST word_token_alist[];
extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin;
/* SPECIFIC_COMPLETION_FUNCTIONS specifies that we have individual
completion functions which indicate what type of completion should be
done (at or before point) that can be bound to key sequences with
the readline library. */
#define SPECIFIC_COMPLETION_FUNCTIONS
#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
static int bash_specific_completion __P((int, rl_compentry_func_t *));
static int bash_complete_filename_internal __P((int));
static int bash_complete_username_internal __P((int));
static int bash_complete_hostname_internal __P((int));
static int bash_complete_variable_internal __P((int));
static int bash_complete_command_internal __P((int));
static int bash_complete_filename __P((int, int));
static int bash_possible_filename_completions __P((int, int));
static int bash_complete_username __P((int, int));
static int bash_possible_username_completions __P((int, int));
static int bash_complete_hostname __P((int, int));
static int bash_possible_hostname_completions __P((int, int));
static int bash_complete_variable __P((int, int));
static int bash_possible_variable_completions __P((int, int));
static int bash_complete_command __P((int, int));
static int bash_possible_command_completions __P((int, int));
static char *glob_complete_word __P((const char *, int));
static int bash_glob_completion_internal __P((int));
static int bash_glob_complete_word __P((int, int));
static int bash_glob_expand_word __P((int, int));
static int bash_glob_list_expansions __P((int, int));
#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
static int edit_and_execute_command __P((int, int, int, char *));
#if defined (VI_MODE)
static int vi_edit_and_execute_command __P((int, int));
static int bash_vi_complete __P((int, int));
#endif
static int emacs_edit_and_execute_command __P((int, int));
/* Non-zero once initalize_readline () has been called. */
int bash_readline_initialized = 0;
/* If non-zero, we do hostname completion, breaking words at `@' and
trying to complete the stuff after the `@' from our own internal
host list. */
int perform_hostname_completion = 1;
/* If non-zero, we don't do command completion on an empty line. */
int no_empty_command_completion;
/* Set FORCE_FIGNORE if you want to honor FIGNORE even if it ignores the
only possible matches. Set to 0 if you want to match filenames if they
are the only possible matches, even if FIGNORE says to. */
int force_fignore = 1;
static char *bash_completer_word_break_characters = " \t\n\"'@><=;|&(:";
static char *bash_nohostname_word_break_characters = " \t\n\"'><=;|&(:";
/* )) */
static rl_hook_func_t *old_rl_startup_hook = (rl_hook_func_t *)NULL;
static int dot_in_path = 0;
/* What kind of quoting is performed by bash_quote_filename:
COMPLETE_DQUOTE = double-quoting the filename
COMPLETE_SQUOTE = single_quoting the filename
COMPLETE_BSQUOTE = backslash-quoting special chars in the filename
*/
#define COMPLETE_DQUOTE 1
#define COMPLETE_SQUOTE 2
#define COMPLETE_BSQUOTE 3
static int completion_quoting_style = COMPLETE_BSQUOTE;
/* Flag values for the final argument to bash_default_completion */
#define DEFCOMP_CMDPOS 1
/* Change the readline VI-mode keymaps into or out of Posix.2 compliance.
Called when the shell is put into or out of `posix' mode. */
void
posix_readline_initialize (on_or_off)
int on_or_off;
{
if (on_or_off)
rl_variable_bind ("comment-begin", "#");
#if defined (VI_MODE)
rl_bind_key_in_map (CTRL ('I'), on_or_off ? rl_insert : rl_complete, vi_insertion_keymap);
#endif
}
/* When this function returns, rl_completer_word_break_characters points to
dynamically allocated memory. */
int
enable_hostname_completion (on_or_off)
int on_or_off;
{
int old_value;
char *at, *nv, *nval;
old_value = perform_hostname_completion;
if (on_or_off)
{
perform_hostname_completion = 1;
rl_special_prefixes = "$@";
}
else
{
perform_hostname_completion = 0;
rl_special_prefixes = "$";
}
/* Now we need to figure out how to appropriately modify and assign
rl_completer_word_break_characters depending on whether we want
hostname completion on or off. */
/* If this is the first time this has been called
(bash_readline_initialized == 0), use the sames values as before, but
allocate new memory for rl_completer_word_break_characters. */
if (bash_readline_initialized == 0 &&
(rl_completer_word_break_characters == 0 ||
rl_completer_word_break_characters == rl_basic_word_break_characters))
{
if (on_or_off)
rl_completer_word_break_characters = savestring (bash_completer_word_break_characters);
else
rl_completer_word_break_characters = savestring (bash_nohostname_word_break_characters);
}
else
{
/* See if we have anything to do. */
at = strchr (rl_completer_word_break_characters, '@');
if ((at == 0 && on_or_off == 0) || (at != 0 && on_or_off != 0))
return old_value;
/* We have something to do. Do it. */
nval = (char *)xmalloc (strlen (rl_completer_word_break_characters) + 1 + on_or_off);
if (on_or_off == 0)
{
/* Turn it off -- just remove `@' from word break chars. We want
to remove all occurrences of `@' from the char list, so we loop
rather than just copy the rest of the list over AT. */
for (nv = nval, at = rl_completer_word_break_characters; *at; )
if (*at != '@')
*nv++ = *at++;
else
at++;
*nv = '\0';
}
else
{
nval[0] = '@';
strcpy (nval + 1, rl_completer_word_break_characters);
}
free (rl_completer_word_break_characters);
rl_completer_word_break_characters = nval;
}
return (old_value);
}
/* Called once from parse.y if we are going to use readline. */
void
initialize_readline ()
{
rl_command_func_t *func;
char kseq[2];
if (bash_readline_initialized)
return;
rl_terminal_name = get_string_value ("TERM");
rl_instream = stdin;
rl_outstream = stderr;
/* Allow conditional parsing of the ~/.inputrc file. */
rl_readline_name = "Bash";
/* Add bindable names before calling rl_initialize so they may be
referenced in the various inputrc files. */
rl_add_defun ("shell-expand-line", shell_expand_line, -1);
#ifdef BANG_HISTORY
rl_add_defun ("history-expand-line", history_expand_line, -1);
rl_add_defun ("magic-space", tcsh_magic_space, -1);
#endif
#ifdef ALIAS
rl_add_defun ("alias-expand-line", alias_expand_line, -1);
# ifdef BANG_HISTORY
rl_add_defun ("history-and-alias-expand-line", history_and_alias_expand_line, -1);
# endif
#endif
/* Backwards compatibility. */
rl_add_defun ("insert-last-argument", rl_yank_last_arg, -1);
rl_add_defun ("operate-and-get-next", operate_and_get_next, -1);
rl_add_defun ("display-shell-version", display_shell_version, -1);
rl_add_defun ("edit-and-execute-command", emacs_edit_and_execute_command, -1);
#if defined (BRACE_COMPLETION)
rl_add_defun ("complete-into-braces", bash_brace_completion, -1);
#endif
#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
rl_add_defun ("complete-filename", bash_complete_filename, -1);
rl_add_defun ("possible-filename-completions", bash_possible_filename_completions, -1);
rl_add_defun ("complete-username", bash_complete_username, -1);
rl_add_defun ("possible-username-completions", bash_possible_username_completions, -1);
rl_add_defun ("complete-hostname", bash_complete_hostname, -1);
rl_add_defun ("possible-hostname-completions", bash_possible_hostname_completions, -1);
rl_add_defun ("complete-variable", bash_complete_variable, -1);
rl_add_defun ("possible-variable-completions", bash_possible_variable_completions, -1);
rl_add_defun ("complete-command", bash_complete_command, -1);
rl_add_defun ("possible-command-completions", bash_possible_command_completions, -1);
rl_add_defun ("glob-complete-word", bash_glob_complete_word, -1);
rl_add_defun ("glob-expand-word", bash_glob_expand_word, -1);
rl_add_defun ("glob-list-expansions", bash_glob_list_expansions, -1);
#endif
rl_add_defun ("dynamic-complete-history", dynamic_complete_history, -1);
/* Bind defaults before binding our custom shell keybindings. */
if (RL_ISSTATE(RL_STATE_INITIALIZED) == 0)
rl_initialize ();
/* Bind up our special shell functions. */
rl_bind_key_if_unbound_in_map (CTRL('E'), shell_expand_line, emacs_meta_keymap);
#ifdef BANG_HISTORY
rl_bind_key_if_unbound_in_map ('^', history_expand_line, emacs_meta_keymap);
#endif
rl_bind_key_if_unbound_in_map (CTRL ('O'), operate_and_get_next, emacs_standard_keymap);
rl_bind_key_if_unbound_in_map (CTRL ('V'), display_shell_version, emacs_ctlx_keymap);
/* In Bash, the user can switch editing modes with "set -o [vi emacs]",
so it is not necessary to allow C-M-j for context switching. Turn
off this occasionally confusing behaviour. */
kseq[0] = CTRL('J');
kseq[1] = '\0';
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
if (func == rl_vi_editing_mode)
rl_unbind_key_in_map (CTRL('J'), emacs_meta_keymap);
kseq[0] = CTRL('M');
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
if (func == rl_vi_editing_mode)
rl_unbind_key_in_map (CTRL('M'), emacs_meta_keymap);
#if defined (VI_MODE)
rl_unbind_key_in_map (CTRL('E'), vi_movement_keymap);
#endif
#if defined (BRACE_COMPLETION)
rl_bind_key_if_unbound_in_map ('{', bash_brace_completion, emacs_meta_keymap); /*}*/
#endif /* BRACE_COMPLETION */
#if defined (SPECIFIC_COMPLETION_FUNCTIONS)
rl_bind_key_if_unbound_in_map ('/', bash_complete_filename, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('/', bash_possible_filename_completions, emacs_ctlx_keymap);
/* Have to jump through hoops here because there is a default binding for
M-~ (rl_tilde_expand) */
kseq[0] = '~';
kseq[1] = '\0';
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
if (func == 0 || func == rl_tilde_expand)
rl_bind_keyseq_in_map (kseq, bash_complete_username, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('~', bash_possible_username_completions, emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('@', bash_complete_hostname, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('@', bash_possible_hostname_completions, emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('$', bash_complete_variable, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('$', bash_possible_variable_completions, emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('!', bash_complete_command, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('!', bash_possible_command_completions, emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('g', bash_glob_complete_word, emacs_meta_keymap);
rl_bind_key_if_unbound_in_map ('*', bash_glob_expand_word, emacs_ctlx_keymap);
rl_bind_key_if_unbound_in_map ('g', bash_glob_list_expansions, emacs_ctlx_keymap);
#endif /* SPECIFIC_COMPLETION_FUNCTIONS */
kseq[0] = TAB;
kseq[1] = '\0';
func = rl_function_of_keyseq (kseq, emacs_meta_keymap, (int *)NULL);
if (func == 0 || func == rl_tab_insert)
rl_bind_key_in_map (TAB, dynamic_complete_history, emacs_meta_keymap);
/* Tell the completer that we want a crack first. */
rl_attempted_completion_function = attempt_shell_completion;
/* Tell the completer that we might want to follow symbolic links or
do other expansion on directory names. */
rl_directory_completion_hook = bash_directory_completion_hook;
/* Tell the filename completer we want a chance to ignore some names. */
rl_ignore_some_completions_function = filename_completion_ignore;
/* Bind C-xC-e to invoke emacs and run result as commands. */
rl_bind_key_if_unbound_in_map (CTRL ('E'), emacs_edit_and_execute_command, emacs_ctlx_keymap);
#if defined (VI_MODE)
rl_bind_key_if_unbound_in_map ('v', vi_edit_and_execute_command, vi_movement_keymap);
# if defined (ALIAS)
rl_bind_key_if_unbound_in_map ('@', posix_edit_macros, vi_movement_keymap);
# endif
rl_bind_key_in_map ('\\', bash_vi_complete, vi_movement_keymap);
rl_bind_key_in_map ('*', bash_vi_complete, vi_movement_keymap);
rl_bind_key_in_map ('=', bash_vi_complete, vi_movement_keymap);
#endif
rl_completer_quote_characters = "'\"";
/* This sets rl_completer_word_break_characters and rl_special_prefixes
to the appropriate values, depending on whether or not hostname
completion is enabled. */
enable_hostname_completion (perform_hostname_completion);
/* characters that need to be quoted when appearing in filenames. */
rl_filename_quote_characters = " \t\n\\\"'@<>=;|&()#$`?*[!:{"; /*}*/
rl_filename_quoting_function = bash_quote_filename;
rl_filename_dequoting_function = bash_dequote_filename;
rl_char_is_quoted_p = char_is_quoted;
#if 0
/* This is superfluous and makes it impossible to use tab completion in
vi mode even when explicitly binding it in ~/.inputrc. sv_strict_posix()
should already have called posix_readline_initialize() when
posixly_correct was set. */
if (posixly_correct)
posix_readline_initialize (1);
#endif
bash_readline_initialized = 1;
}
/* On Sun systems at least, rl_attempted_completion_function can end up
getting set to NULL, and rl_completion_entry_function set to do command
word completion if Bash is interrupted while trying to complete a command
word. This just resets all the completion functions to the right thing.
It's called from throw_to_top_level(). */
void
bashline_reinitialize ()
{
tilde_initialize ();
rl_attempted_completion_function = attempt_shell_completion;
rl_completion_entry_function = NULL;
rl_directory_completion_hook = bash_directory_completion_hook;
rl_ignore_some_completions_function = filename_completion_ignore;
}
/* Contains the line to push into readline. */
static char *push_to_readline = (char *)NULL;
/* Push the contents of push_to_readline into the
readline buffer. */
static int
bash_push_line ()
{
if (push_to_readline)
{
rl_insert_text (push_to_readline);
free (push_to_readline);
push_to_readline = (char *)NULL;
rl_startup_hook = old_rl_startup_hook;
}
return 0;
}
/* Call this to set the initial text for the next line to read
from readline. */
int
bash_re_edit (line)
char *line;
{
FREE (push_to_readline);
push_to_readline = savestring (line);
old_rl_startup_hook = rl_startup_hook;
rl_startup_hook = bash_push_line;
return (0);
}
static int
display_shell_version (count, c)
int count, c;
{
rl_crlf ();
show_shell_version (0);
putc ('\r', rl_outstream);
fflush (rl_outstream);
rl_on_new_line ();
rl_redisplay ();
return 0;
}
/* **************************************************************** */
/* */
/* Readline Stuff */
/* */
/* **************************************************************** */
/* If the user requests hostname completion, then simply build a list
of hosts, and complete from that forever more, or at least until
HOSTFILE is unset. */
/* THIS SHOULD BE A STRINGLIST. */
/* The kept list of hostnames. */
static char **hostname_list = (char **)NULL;
/* The physical size of the above list. */
static int hostname_list_size;
/* The number of hostnames in the above list. */
static int hostname_list_length;
/* Whether or not HOSTNAME_LIST has been initialized. */
int hostname_list_initialized = 0;
/* Initialize the hostname completion table. */
static void
initialize_hostname_list ()
{
char *temp;
temp = get_string_value ("HOSTFILE");
if (temp == 0)
temp = get_string_value ("hostname_completion_file");
if (temp == 0)
temp = DEFAULT_HOSTS_FILE;
snarf_hosts_from_file (temp);
if (hostname_list)
hostname_list_initialized++;
}
/* Add NAME to the list of hosts. */
static void
add_host_name (name)
char *name;
{
if (hostname_list_length + 2 > hostname_list_size)
{
hostname_list_size = (hostname_list_size + 32) - (hostname_list_size % 32);
hostname_list = strvec_resize (hostname_list, hostname_list_size);
}
hostname_list[hostname_list_length++] = savestring (name);
hostname_list[hostname_list_length] = (char *)NULL;
}
#define cr_whitespace(c) ((c) == '\r' || (c) == '\n' || whitespace(c))
static void
snarf_hosts_from_file (filename)
char *filename;
{
FILE *file;
char *temp, buffer[256], name[256];
register int i, start;
file = fopen (filename, "r");
if (file == 0)
return;
while (temp = fgets (buffer, 255, file))
{
/* Skip to first character. */
for (i = 0; buffer[i] && cr_whitespace (buffer[i]); i++)
;
/* If comment or blank line, ignore. */
if (buffer[i] == '\0' || buffer[i] == '#')
continue;
/* If `preprocessor' directive, do the include. */
if (strncmp (buffer + i, "$include ", 9) == 0)
{
char *incfile, *t;
/* Find start of filename. */
for (incfile = buffer + i + 9; *incfile && whitespace (*incfile); incfile++)
;
/* Find end of filename. */
for (t = incfile; *t && cr_whitespace (*t) == 0; t++)
;
*t = '\0';
snarf_hosts_from_file (incfile);
continue;
}
/* Skip internet address if present. */
if (DIGIT (buffer[i]))
for (; buffer[i] && cr_whitespace (buffer[i]) == 0; i++);
/* Gobble up names. Each name is separated with whitespace. */
while (buffer[i])
{
for (; cr_whitespace (buffer[i]); i++)
;
if (buffer[i] == '\0' || buffer[i] == '#')
break;
/* Isolate the current word. */
for (start = i; buffer[i] && cr_whitespace (buffer[i]) == 0; i++)
;
if (i == start)
continue;
strncpy (name, buffer + start, i - start);
name[i - start] = '\0';
add_host_name (name);
}
}
fclose (file);
}
/* Return the hostname list. */
char **
get_hostname_list ()
{
if (hostname_list_initialized == 0)
initialize_hostname_list ();
return (hostname_list);
}
void
clear_hostname_list ()
{
register int i;
if (hostname_list_initialized == 0)
return;
for (i = 0; i < hostname_list_length; i++)
free (hostname_list[i]);
hostname_list_length = 0;
}
/* Return a NULL terminated list of hostnames which begin with TEXT.
Initialize the hostname list the first time if neccessary.
The array is malloc ()'ed, but not the individual strings. */
static char **
hostnames_matching (text)
char *text;
{
register int i, len, nmatch, rsize;
char **result;
if (hostname_list_initialized == 0)
initialize_hostname_list ();
if (hostname_list_initialized == 0)
return ((char **)NULL);
/* Special case. If TEXT consists of nothing, then the whole list is
what is desired. */
if (*text == '\0')
{
result = strvec_create (1 + hostname_list_length);
for (i = 0; i < hostname_list_length; i++)
result[i] = hostname_list[i];
result[i] = (char *)NULL;
return (result);
}
/* Scan until found, or failure. */
len = strlen (text);
result = (char **)NULL;
for (i = nmatch = rsize = 0; i < hostname_list_length; i++)
{
if (STREQN (text, hostname_list[i], len) == 0)
continue;
/* OK, it matches. Add it to the list. */
if (nmatch >= (rsize - 1))
{
rsize = (rsize + 16) - (rsize % 16);
result = strvec_resize (result, rsize);
}
result[nmatch++] = hostname_list[i];
}
if (nmatch)
result[nmatch] = (char *)NULL;
return (result);
}
/* The equivalent of the Korn shell C-o operate-and-get-next-history-line
editing command. */
static int saved_history_line_to_use = -1;
static int
set_saved_history ()
{
if (saved_history_line_to_use >= 0)
rl_get_previous_history (history_length - saved_history_line_to_use, 0);
saved_history_line_to_use = -1;
rl_startup_hook = old_rl_startup_hook;
return (0);
}
static int
operate_and_get_next (count, c)
int count, c;
{
int where;
/* Accept the current line. */
rl_newline (1, c);
/* Find the current line, and find the next line to use. */
where = where_history ();
if ((history_is_stifled () && (history_length >= history_max_entries)) ||
(where >= history_length - 1))
saved_history_line_to_use = where;
else
saved_history_line_to_use = where + 1;
old_rl_startup_hook = rl_startup_hook;
rl_startup_hook = set_saved_history;
return 0;
}
/* This vi mode command causes VI_EDIT_COMMAND to be run on the current
command being entered (if no explicit argument is given), otherwise on
a command from the history file. */
#define VI_EDIT_COMMAND "fc -e \"${VISUAL:-${EDITOR:-vi}}\""
#define EMACS_EDIT_COMMAND "fc -e \"${VISUAL:-${EDITOR:-emacs}}\""
#define POSIX_VI_EDIT_COMMAND "fc -e vi"
static int
edit_and_execute_command (count, c, editing_mode, edit_command)
int count, c, editing_mode;
char *edit_command;
{
char *command;
int r, cclc, rrs;
rrs = rl_readline_state;
cclc = current_command_line_count;
/* Accept the current line. */
rl_newline (1, c);
if (rl_explicit_arg)
{
command = (char *)xmalloc (strlen (edit_command) + 8);
sprintf (command, "%s %d", edit_command, count);
}
else
{
/* Take the command we were just editing, add it to the history file,
then call fc to operate on it. We have to add a dummy command to
the end of the history because fc ignores the last command (assumes
it's supposed to deal with the command before the `fc'). */
using_history ();
bash_add_history (rl_line_buffer);
bash_add_history ("");
history_lines_this_session++;
using_history ();
command = savestring (edit_command);
}
/* Now, POSIX.1-2001 and SUSv3 say that the commands executed from the
temporary file should be placed into the history. We don't do that
yet. */
r = parse_and_execute (command, (editing_mode == VI_EDITING_MODE) ? "v" : "C-xC-e", SEVAL_NOHIST);
current_command_line_count = cclc;
/* Now erase the contents of the current line and undo the effects of the
rl_accept_line() above. We don't even want to make the text we just
executed available for undoing. */
rl_line_buffer[0] = '\0'; /* XXX */
rl_point = rl_end = 0;
rl_done = 0;
rl_readline_state = rrs;
rl_forced_update_display ();
return r;
}
#if defined (VI_MODE)
static int
vi_edit_and_execute_command (count, c)
int count, c;
{
if (posixly_correct)
return (edit_and_execute_command (count, c, VI_EDITING_MODE, POSIX_VI_EDIT_COMMAND));
else
return (edit_and_execute_command (count, c, VI_EDITING_MODE, VI_EDIT_COMMAND));
}
#endif /* VI_MODE */
static int
emacs_edit_and_execute_command (count, c)
int count, c;
{
return (edit_and_execute_command (count, c, EMACS_EDITING_MODE, EMACS_EDIT_COMMAND));
}
#if defined (ALIAS)
static int
posix_edit_macros (count, key)
int count, key;
{
int c;
char alias_name[3], *alias_value, *macro;
c = rl_read_key ();
alias_name[0] = '_';
alias_name[1] = c;
alias_name[2] = '\0';
alias_value = get_alias_value (alias_name);
if (alias_value && *alias_value)
{
macro = savestring (alias_value);
rl_push_macro_input (macro);
}
return 0;
}
#endif
/* **************************************************************** */
/* */
/* How To Do Shell Completion */
/* */
/* **************************************************************** */
#define COMMAND_SEPARATORS ";|&{(`"
/* )} */
static int
check_redir (ti)
int ti;
{
register int this_char, prev_char;
/* Handle the two character tokens `>&', `<&', and `>|'.
We are not in a command position after one of these. */
this_char = rl_line_buffer[ti];
prev_char = rl_line_buffer[ti - 1];
if ((this_char == '&' && (prev_char == '<' || prev_char == '>')) ||
(this_char == '|' && prev_char == '>'))
return (1);
else if ((this_char == '{' && prev_char == '$') || /* } */
(char_is_quoted (rl_line_buffer, ti)))
return (1);
return (0);
}
#if defined (PROGRAMMABLE_COMPLETION)
/*
* XXX - because of the <= start test, and setting os = s+1, this can
* potentially return os > start. This is probably not what we want to
* happen, but fix later after 2.05a-release.
*/
static int
find_cmd_start (start)
int start;
{
register int s, os;
os = 0;
while (((s = skip_to_delim (rl_line_buffer, os, COMMAND_SEPARATORS)) <= start) &&
rl_line_buffer[s])
os = s+1;
return os;
}
static int
find_cmd_end (end)
int end;
{
register int e;
e = skip_to_delim (rl_line_buffer, end, COMMAND_SEPARATORS);
return e;
}
static char *
find_cmd_name (start)
int start;
{
char *name;
register int s, e;
for (s = start; whitespace (rl_line_buffer[s]); s++)
;
/* skip until a shell break character */
e = skip_to_delim (rl_line_buffer, s, "()<>;&| \t\n");
name = substring (rl_line_buffer, s, e);
return (name);
}
static char *
prog_complete_return (text, matchnum)
const char *text;
int matchnum;
{
static int ind;
if (matchnum == 0)
ind = 0;
if (prog_complete_matches == 0 || prog_complete_matches[ind] == 0)
return (char *)NULL;
return (prog_complete_matches[ind++]);
}
#endif /* PROGRAMMABLE_COMPLETION */
/* Do some completion on TEXT. The indices of TEXT in RL_LINE_BUFFER are
at START and END. Return an array of matches, or NULL if none. */
static char **