/* ==================================================================
FILE: "/home/joze/src/tclreadline/tclreadline.c"
LAST MODIFICATION: "Thu, 23 Mar 2000 22:42:52 +0100 (joze)"
(C) 1998 - 2000 by Johannes Zellner, <johannes@zellner.org>
$Id$
---
tclreadline -- gnu readline for tcl
Copyright (C) 1998 - 2000 by Johannes Zellner
This program 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
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
<johannes@zellner.org>, http://www.zellner.org/tclreadline/
================================================================== */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <tcl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined (READLINE_LIBRARY)
# include <readline.h>
# include <history.h>
#else
# include <readline/readline.h>
# include <readline/history.h>
#endif
/**
* this prototype is missing
* in readline.h
*/
void rl_extend_line_buffer(int len);
#ifdef EXECUTING_MACRO_HACK
/**
* this prototype is private in readline's file `macro.c'.
* We need it here to decide, if we should read more
* characters from a macro. Dirty, but it should work.
*/
extern char* _rl_executing_macro;
#endif
#include "tclreadline.h"
#define MALLOC(size) Tcl_Alloc((int) size)
#define FREE(ptr) if (ptr) { Tcl_Free((char*) ptr); ptr = 0; }
enum {
_CMD_SET = (1 << 0),
_CMD_GET = (1 << 1)
};
typedef struct cmds_t {
struct cmds_t* prev;
char** cmd;
struct cmds_t* next;
} cmds_t;
#define ISWHITE(c) ((' ' == c) || ('\t' == c) || ('\n' == c))
/*
* forward declarations.
*/
char* stripleft(char* in);
char* stripright(char* in);
char* stripwhite(char* in);
int TclReadlineLineComplete(void);
void TclReadlineTerminate(int state);
char* TclReadlineQuote(char* text, char* quotechars);
int TclReadlineCmd(ClientData clientData, Tcl_Interp* interp,
int argc, char** argv);
void TclReadlineReadHandler(ClientData clientData, int mask);
void TclReadlineLineCompleteHandler(char* ptr);
int Tclreadline_SafeInit(Tcl_Interp* interp);
int Tclreadline_Init(Tcl_Interp* interp);
int TclReadlineInitialize(Tcl_Interp* interp, char* historyfile);
int blank_line(char* str);
char** TclReadlineCompletion(char* text, int start, int end);
char* TclReadline0generator(char* text, int state);
char* TclReadlineKnownCommands(char* text, int state, int mode);
int TclReadlineParse(char** args, int maxargs, char* buf);
enum {
LINE_PENDING = -1,
LINE_EOF = (1 << 8),
LINE_COMPLETE = (1 << 9)
};
/**
* global variables
*/
static int tclrl_state = TCL_OK;
static char* tclrl_eof_string = (char*) NULL;
static char* tclrl_custom_completer = (char*) NULL;
static char* tclrl_last_line = (char*) NULL;
static int tclrl_use_builtin_completer = 1;
static int tclrl_history_length = -1;
Tcl_Interp* tclrl_interp = (Tcl_Interp*) NULL;
char*
stripleft(char* in)
{
char* ptr = in;
while (*ptr && *ptr <= ' ')
ptr++;
if (in != ptr)
memmove(in, ptr, strlen(ptr) + 1);
return in;
}
char*
stripright(char* in)
{
char* ptr;
for (ptr = strchr(in, '\0') - 1; ptr >= in && *ptr <= ' '; ptr--)
*ptr = '\0';
return in;
}
char*
stripwhite(char* in)
{
stripleft(in);
stripright(in);
return in;
}
int
TclReadlineLineComplete(void)
{
return !(tclrl_state == LINE_PENDING);
}
void
TclReadlineTerminate(int state)
{
tclrl_state = state;
rl_callback_handler_remove();
}
char*
TclReadlineQuote(char* text, char* quotechars)
{
char* ptr;
char* result_c;
int i, len = strlen(quotechars);
Tcl_DString result;
Tcl_DStringInit(&result);
for (ptr = text; ptr && *ptr; ptr++) {
for (i = 0; i < len; i++) {
if (quotechars[i] == *ptr) {
Tcl_DStringAppend(&result, "\\", 1);
break;
}
}
Tcl_DStringAppend(&result, ptr, 1);
}
result_c = strdup(Tcl_DStringValue(&result));
return result_c;
}
int
TclReadlineCmd(
ClientData clientData,
Tcl_Interp* interp, /* Current interpreter */
int argc, /* Number of arguments */
char** argv /* Argument strings */
)
{
int i, obj_idx, status;
Tcl_Obj** objv = (Tcl_Obj**) MALLOC((argc + 1) * sizeof(Tcl_Obj *));
static char *subCmds[] = {
"read", "initialize", "write", "add", "complete",
"customcompleter", "builtincompleter", "eofchar",
"reset-terminal", "bell",
(char *) NULL
};
enum SubCmdIdx {
TCLRL_READ, TCLRL_INITIALIZE, TCLRL_WRITE, TCLRL_ADD, TCLRL_COMPLETE,
TCLRL_CUSTOMCOMPLETER, TCLRL_BUILTINCOMPLETER, TCLRL_EOFCHAR,
TCLRL_RESET_TERMINAL, TCLRL_BELL
};
Tcl_ResetResult(interp); /* clear the result space */
for (i = 0; i < argc; i++) {
Tcl_Obj* objPtr = Tcl_NewStringObj(argv[i], -1);
Tcl_IncrRefCount(objPtr);
objv[i] = objPtr;
}
objv[argc] = 0; /* terminate */
if (argc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
return TCL_ERROR;
}
status = Tcl_GetIndexFromObj
(interp, objv[1], subCmds, "option", 0, (int *) &obj_idx);
if (status != TCL_OK) {
FREE(objv)
return status;
}
switch (obj_idx) {
case TCLRL_READ:
rl_callback_handler_install(argc == 3 ? argv[2] : "%",
TclReadlineLineCompleteHandler);
Tcl_CreateFileHandler(0, TCL_READABLE,
TclReadlineReadHandler, (ClientData) NULL);
/**
* Main Loop.
* XXX each modification of the global variables
* which terminates the main loop must call
* rl_callback_handler_remove() to leave
* readline in a defined state. XXX
*/
tclrl_state = LINE_PENDING;
while (!TclReadlineLineComplete()) {
#ifdef EXECUTING_MACRO_HACK
/**
* check first, if more characters are
* available from _rl_executing_macro,
* because Tcl_DoOneEvent() will (naturally)
* not detect this `event'.
*/
if (_rl_executing_macro)
TclReadlineReadHandler((ClientData) NULL, TCL_READABLE);
else
#endif
Tcl_DoOneEvent(TCL_ALL_EVENTS);
}
Tcl_DeleteFileHandler(0);
switch (tclrl_state) {
case LINE_COMPLETE:
return TCL_OK;
/* NOTREACHED */
break;
case LINE_EOF:
if (tclrl_eof_string)
return Tcl_Eval(interp, tclrl_eof_string);
else
return TCL_OK;
/* NOTREACHED */
break;
default:
return tclrl_state;
/* NOTREACHED */
break;
}
break;
case TCLRL_INITIALIZE:
if (3 != argc) {
Tcl_WrongNumArgs(interp, 2, objv, "historyfile");
return TCL_ERROR;
} else {
return TclReadlineInitialize(interp, argv[2]);
}
break;
case TCLRL_WRITE:
if (3 != argc) {
Tcl_WrongNumArgs(interp, 2, objv, "historyfile");
return TCL_ERROR;
} else if (write_history(argv[2])) {
Tcl_AppendResult(interp, "unable to write history to `",
argv[2], "'\n", (char*) NULL);
return TCL_ERROR;
}
if (tclrl_history_length >= 0) {
history_truncate_file(argv[2], tclrl_history_length);
}
return TCL_OK;
break;
case TCLRL_ADD:
if (3 != argc) {
Tcl_WrongNumArgs(interp, 2, objv, "completerLine");
return TCL_ERROR;
} else if (TclReadlineKnownCommands(argv[2], (int) 0, _CMD_SET)) {
Tcl_AppendResult(interp, "unable to add command \"",
argv[2], "\"\n", (char*) NULL);
}
break;
case TCLRL_COMPLETE:
if (3 != argc) {
Tcl_WrongNumArgs(interp, 2, objv, "line");
return TCL_ERROR;
} else if (Tcl_CommandComplete(argv[2])) {
Tcl_AppendResult(interp, "1", (char*) NULL);
} else {
Tcl_AppendResult(interp, "0", (char*) NULL);
}
break;
case TCLRL_CUSTOMCOMPLETER:
if (argc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?scriptCompleter?");
return TCL_ERROR;
} else if (3 == argc) {
if (tclrl_custom_completer)
FREE(tclrl_custom_completer);
if (!blank_line(argv[2]))
tclrl_custom_completer = stripwhite(strdup(argv[2]));
}
Tcl_AppendResult(interp, tclrl_custom_completer, (char*) NULL);
break;
case TCLRL_BUILTINCOMPLETER:
if (argc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?boolean?");
return TCL_ERROR;
} else if (3 == argc) {
int bool = tclrl_use_builtin_completer;
if (TCL_OK != Tcl_GetBoolean(interp, argv[2], &bool)) {
Tcl_AppendResult(interp,
"wrong # args: should be a boolean value.",
(char*) NULL);
return TCL_ERROR;
} else {
tclrl_use_builtin_completer = bool;
}
}
Tcl_AppendResult(interp, tclrl_use_builtin_completer ? "1" : "0",
(char*) NULL);
break;
case TCLRL_EOFCHAR:
if (argc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?script?");
return TCL_ERROR;
} else if (3 == argc) {
if (tclrl_eof_string)
FREE(tclrl_eof_string);
if (!blank_line(argv[2]))
tclrl_eof_string = stripwhite(strdup(argv[2]));
}
Tcl_AppendResult(interp, tclrl_eof_string, (char*) NULL);
break;
case TCLRL_RESET_TERMINAL:
/* TODO: add this to the completer */
if (argc > 3) {
Tcl_WrongNumArgs(interp, 2, objv, "?terminal-name?");
return TCL_ERROR;
}
if (3 == argc) {
/*
* - tcl8.0 doesn't have Tcl_GetString()
* - rl_reset_terminal() might be defined
* to take no arguments. This might produce
* a compiler warning.
*/
rl_reset_terminal(Tcl_GetStringFromObj(objv[2], (int*) NULL));
#ifdef CLEANUP_AFER_SIGNAL
} else {
rl_cleanup_after_signal();
#endif
}
break;
case TCLRL_BELL:
/*
* ring the terminal bell obeying the current
* settings -- audible or visible.
*/
ding();
break;
default:
goto BAD_COMMAND;
/* NOTREACHED */
break;
}
return TCL_OK;
BAD_COMMAND:
Tcl_AppendResult(interp,
"wrong # args: should be \"readline option ?arg ...?\"",
(char*) NULL);
return TCL_ERROR;
}
void
TclReadlineReadHandler(ClientData clientData, int mask)
{
if (mask & TCL_READABLE) {
#ifdef EXECUTING_MACRO_HACK
do {
#endif
rl_callback_read_char();
#ifdef EXECUTING_MACRO_HACK
/**
* check, if we're inside a macro and
* if so, read all macro characters
* until the next eol.
*/
} while (_rl_executing_macro && !TclReadlineLineComplete());
#endif
}
}
void
TclReadlineLineCompleteHandler(char* ptr)
{
if (!ptr) { /* <c-d> */
TclReadlineTerminate(LINE_EOF);
} else {
/**
* From version 0.9.3 upwards, all lines are
* returned, even empty lines. (Only non-empty
* lines are stuffed in readline's history.)
* The calling script is responsible for handling
* empty strings.
*/
char* expansion = (char*) NULL;
int status = history_expand(ptr, &expansion);
if (status >= 1) {
#if 0
Tcl_Channel channel = Tcl_MakeFileChannel(stdout, TCL_WRITABLE);
/* Tcl_RegisterChannel(interp, channel); */
(void) Tcl_WriteChars(channel, expansion, -1);
Tcl_Flush(channel);
Tcl_Close(interp, channel);
#else
/* TODO: make this a valid tcl output */
printf("%s\n", expansion);
#endif
} else if (-1 == status) {
Tcl_AppendResult
(tclrl_interp, "error in history expansion\n", (char*) NULL);
TclReadlineTerminate(TCL_ERROR);
}
/**
* TODO: status == 2 ...
*/
Tcl_AppendResult(tclrl_interp, expansion, (char*) NULL);
#ifdef EXECUTING_MACRO_HACK
/**
* don't stuff macro lines
* into readline's history.
*/
if(!_rl_executing_macro) {
#endif
/**
* don't stuff empty lines
* into readline's history.
* don't stuff twice the same
* line into readline's history.
*/
if (expansion && *expansion && (!tclrl_last_line ||
strcmp(tclrl_last_line, expansion))) {
add_history(expansion);
}
if (tclrl_last_line)
free(tclrl_last_line);
tclrl_last_line = strdup(expansion);
#ifdef EXECUTING_MACRO_HACK
}
#endif
/**
* tell the calling routines to terminate.
*/
TclReadlineTerminate(LINE_COMPLETE);
FREE(ptr);
FREE(expansion);
}
}
int
Tclreadline_SafeInit(Tcl_Interp *interp)
{
return Tclreadline_Init(interp);
}
int
Tclreadline_Init(Tcl_Interp *interp)
{
int status;
Tcl_CreateCommand(interp, "::tclreadline::readline", TclReadlineCmd,
(ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);
tclrl_interp = interp;
if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::historyLength",
(char*) &tclrl_history_length, TCL_LINK_INT)))
return status;
if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::library",
(char*) &TCLRL_LIBRARY, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
return status;
if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::version",
(char*) &TCLRL_VERSION, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
return status;
if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::patchLevel",
(char*) &TCLRL_PATCHLEVEL, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
return status;
if (TCL_OK != (status = Tcl_LinkVar(interp, "tclreadline_library",
(char*) &TCLRL_LIBRARY, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
return status;
if (TCL_OK != (status = Tcl_LinkVar(interp, "tclreadline_version",
(char*) &TCLRL_VERSION, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
return status;
if (TCL_OK != (status = Tcl_LinkVar(interp, "tclreadline_patchLevel",
(char*) &TCLRL_PATCHLEVEL, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
return status;
return Tcl_PkgProvide(interp, "tclreadline", TCLRL_VERSION);
}
int
TclReadlineInitialize(Tcl_Interp* interp, char* historyfile)
{
rl_readline_name = "tclreadline";
/* rl_special_prefixes = "${\"["; */
rl_special_prefixes = "$";
/**
* default is " \t\n\"\\'`@$><=;|&{("
* removed "(" <-- arrays
* removed "{" <-- `${' variables
* removed "<" <-- completion lists with < ... >
* added "[]"
* added "}"
*/
/* 11.Sep rl_basic_word_break_characters = " \t\n\"\\@$}=;|&[]"; */
/* besser (11. Sept) 2. (removed \") */
/* rl_basic_word_break_characters = " \t\n\\@$}=;|&[]"; */
/* besser (11. Sept) 3. (removed }) */
rl_basic_word_break_characters = " \t\n\\@$=;|&[]";
#if 0
rl_basic_quote_characters = "\"{"; /* XXX ??? XXX */
rl_completer_quote_characters = "\"";
#endif
/*
rl_filename_quote_characters
= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
rl_filename_quoting_function
= (CPFunction*) TclReadlineFilenameQuotingFunction;
*/
/*
rl_filename_quoting_desired = 1;
*/
using_history();
if (!tclrl_eof_string)
tclrl_eof_string = strdup("puts {}; exit");
/*
* try to read historyfile in home
* directory. If this failes, this
* is *not* an error.
*/
rl_attempted_completion_function = (CPPFunction *) TclReadlineCompletion;
if (read_history(historyfile)) {
if (write_history(historyfile)) {
Tcl_AppendResult (interp, "warning: `",
historyfile, "' is not writable.", (char*) NULL);
}
}
return TCL_OK;
}
int
blank_line(char* str)
{
char* ptr;
for (ptr = str; ptr && *ptr; ptr++) {
if (!ISWHITE(*ptr))
return 0;
}
return 1;
}
char**
TclReadlineCompletion(char* text, int start, int end)
{
char** matches = (char**) NULL;
int status;
rl_completion_append_character = ' '; /* reset, just in case ... */
if (text && ('!' == text[0]
|| (start && rl_line_buffer[start - 1] == '!' /* for '$' */))) {
char* expansion = (char*) NULL;
int oldlen = strlen(rl_line_buffer);
status = history_expand(rl_line_buffer, &expansion);
if (status >= 1) {
rl_extend_line_buffer(strlen(expansion) + 1);
strcpy(rl_line_buffer, expansion);
rl_end = strlen(expansion);
rl_point += strlen(expansion) - oldlen;
FREE(expansion);
/*
* TODO:
* because we return 0 == matches,
* the filename completer will still beep.
rl_inhibit_completion = 1;
*/
return matches;
}
FREE(expansion);
}
if (tclrl_custom_completer) {
char start_s[BUFSIZ], end_s[BUFSIZ];
Tcl_Obj* obj;
Tcl_Obj** objv;
int objc;
int state;
char* quoted_text = TclReadlineQuote(text, "$[]{}\"");
char* quoted_rl_line_buffer
= TclReadlineQuote(rl_line_buffer, "$[]{}\"");
sprintf(start_s, "%d", start);
sprintf(end_s, "%d", end);
Tcl_ResetResult(tclrl_interp); /* clear result space */
state = Tcl_VarEval(tclrl_interp, tclrl_custom_completer,
" \"", quoted_text, "\" ", start_s, " ", end_s,
" \"", quoted_rl_line_buffer, "\"", (char*) NULL);
FREE(quoted_text);
FREE(quoted_rl_line_buffer);
if (TCL_OK != state) {
Tcl_AppendResult (tclrl_interp, " `", tclrl_custom_completer,
" \"", quoted_text, "\" ", start_s, " ", end_s,
" \"", quoted_rl_line_buffer, "\"' failed.", (char*) NULL);
TclReadlineTerminate(state);
return matches;
}
obj = Tcl_GetObjResult(tclrl_interp);
status = Tcl_ListObjGetElements(tclrl_interp, obj, &objc, &objv);
if (TCL_OK != status)
return matches;
if (objc) {
int i, length;
matches = (char**) MALLOC(sizeof(char*) * (objc + 1));
for (i = 0; i < objc; i++) {
matches[i] = strdup(Tcl_GetStringFromObj(objv[i], &length));
if (1 == objc && !strlen(matches[i])) {
FREE(matches[i]);
FREE(matches);
Tcl_ResetResult(tclrl_interp); /* clear result space */
return (char**) NULL;
}
}
/**
* this is a special one:
* if the script returns exactly two arguments
* and the second argument is the empty string,
* the rl_completion_append_character is set
* temporaryly to NULL.
*/
if (2 == objc && !strlen(matches[1])) {
i--;
FREE(matches[1]);
rl_completion_append_character = '\0';
}
matches[i] = (char*) NULL; /* terminate */
}
Tcl_ResetResult(tclrl_interp); /* clear result space */
}
if (!matches && tclrl_use_builtin_completer) {
matches = completion_matches(text, TclReadline0generator);
}
return matches;
}
char*
TclReadline0generator(char* text, int state)
{
return TclReadlineKnownCommands(text, state, _CMD_GET);
}
char*
TclReadlineKnownCommands(char* text, int state, int mode)
{
static int len;
static cmds_t *cmds = (cmds_t *) NULL, *new;
char* tmp;
char* args[256];
int i, argc;
char** name;
char* local_line = (char*) NULL;
int sub;
switch (mode) {
case _CMD_SET:
new = (cmds_t *) MALLOC(sizeof(cmds_t));
new->next = (cmds_t *) NULL;
if (!cmds) {
cmds = new;
cmds->prev = new;
}
else {
cmds->prev->next = new;
cmds->prev = new;
}
tmp = strdup(text);
argc = TclReadlineParse(args, sizeof(args), tmp);
new->cmd = (char**) MALLOC(sizeof(char*) * (argc + 1));
for (i = 0; i < argc; i++)
new->cmd[i] = args[i];
new->cmd[argc] = (char*) NULL;
return (char*) NULL;
break;
case _CMD_GET:
local_line = strdup(rl_line_buffer);
sub = TclReadlineParse(args, sizeof(args), local_line);
if (0 == sub || (1 == sub && '\0' != text[0])) {
if (!state) {
new = cmds;
len = strlen(text);
}
while (new && (name = new->cmd)) {
new = new->next;
if (!strncmp(name[0], text, len))
return strdup(name[0]);
}
return (char*) NULL;
} else {
if (!state) {
new = cmds;
len = strlen(text);
while (new && (name = new->cmd)) {
if (!strcmp(name[0], args[0]))
break;
new = new->next;
}
if (!new)
return (char*) NULL;
for (i = 0; new->cmd[i]; i++) /* EMPTY */;
if (sub < i && !strncmp(new->cmd[sub], text, len))
return strdup(new->cmd[sub]);
else
return (char*) NULL;
}
else
return (char*) NULL;
/* NOTREACHED */
break;
}
default:
return (char*) NULL;
break;
}
/* NOTREACHED */
}
int
TclReadlineParse(char** args, int maxargs, char* buf)
{
int nr = 0;
while (*buf != '\0' && nr < maxargs) {
/*
* Strip whitespace. Use nulls, so
* that the previous argument is terminated
* automatically.
*/
while (ISWHITE(*buf))
*buf++ = '\0';
if (!(*buf)) /* don't count the terminating NULL */
break;
*args++ = buf;
nr++;
while (('\0' != *buf) && !ISWHITE(*buf))
buf++;
}
*args = '\0';
return nr;
}
Documentation