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/* ==================================================================
FILE: "/home/joze/src/tclreadline/tclreadline.c"
LAST MODIFICATION: "Fri Aug 20 23:41:24 1999 (joze)"
(C) 1998, 1999 by Johannes Zellner, <johannes@zellner.org>
$Id$
---
tclreadline -- gnu readline for tcl
Copyright (C) 1999 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/
================================================================== */
#include <tcl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define READLINE_LIBRARY
#include <readline.h>
#include <history.h>
#include <tclreadline.h>
#define MALLOC(size) Tcl_Alloc ((int) size)
#define FREE(ptr) if (ptr) Tcl_Free ((char *) ptr)
enum {
_CMD_SET = (1 << 0),
_CMD_GET = (1 << 1),
_CMD_SUB_GET = (1 << 2)
};
typedef struct cmds_t {
struct cmds_t *prev;
char **cmd;
struct cmds_t *next;
} cmds_t;
#define STRIPLEFT(ptr) \
do { \
char *tmp = ptr; \
while (*tmp && *tmp <= ' ') \
tmp ++; \
strcpy (ptr, tmp); \
} while (0)
#define STRIPRIGHT(ptr) \
do { \
char *__tmp__; \
for (__tmp__ = strchr (ptr, '\0') - 1; \
__tmp__ >= ptr && *__tmp__ <= ' '; __tmp__--) \
*__tmp__ = '\0'; \
} while (0)
#define STRIPWHITE(ptr) \
do { \
STRIPLEFT (ptr); \
STRIPRIGHT (ptr); \
} while (0)
/*
* forward declarations.
*/
int TclReadlineCmd (ClientData clientData, Tcl_Interp *interp,
int argc, char **argv);
void TclReadlineDataAvailableHandler (ClientData clientData, int mask);
void TclReadlineLineCompleteHandler (char *ptr);
int Tclreadline_SafeInit (Tcl_Interp *interp);
int Tclreadline_Init (Tcl_Interp *interp);
char* TclReadlineInitialize (char *historyfile);
char** TclReadlineCompletion (char *text, int start, int end);
char* TclReadline0generator (char *text, int state);
char* TclReadline1generator (char *text, int state);
char* TclReadlineKnownCommands (char *text, int state, int mode);
int TclReadlineEventHook (void);
int TclReadlineParse (char **args, int maxargs, char *buf);
enum {
LINE_PENDING,
LINE_CONTROL_D,
LINE_COMPLETE
};
static int line_complete = LINE_PENDING;
static char *line = (char *) NULL;
/*
* Script to set the tclreadline library path in the
* variable global "tclreadline_library"
*/
int TclReadlineCmd (clientData, interp, argc, argv)
ClientData clientData; /* Main window associated with interpreter */
Tcl_Interp *interp; /* Current interpreter */
int argc; /* Number of arguments */
char **argv; /* Argument strings */
{
int c, length;
if (argc < 2) {
interp->result = "wrong # args";
for (c = 0; c < argc; c++)
fprintf (stderr, "argv[%d] = %s\n", c, argv[c]);
return TCL_ERROR;
}
c = argv[1][0];
length = strlen(argv[1]);
if (c == 'r' && strncmp (argv[1], "read", length) == 0) {
char *expansion = (char *) NULL;
int status;
line_complete = LINE_PENDING;
rl_callback_handler_install (argc == 3 ? argv[2] : "%",
TclReadlineLineCompleteHandler);
Tcl_CreateFileHandler (0, TCL_READABLE,
TclReadlineDataAvailableHandler, (ClientData) NULL);
while (LINE_PENDING == line_complete) {
Tcl_DoOneEvent (0);
}
Tcl_DeleteFileHandler (0);
if (LINE_CONTROL_D == line_complete) {
Tcl_Eval (interp, "puts {}; exit");
}
status = history_expand (line, &expansion);
if (status == 1)
printf ("%s\n", expansion);
else if (status == -1)
Tcl_AppendResult (interp, "error in history expansion\n",
(char *) NULL);
if (expansion && *expansion)
add_history (expansion);
Tcl_AppendResult (interp, expansion, (char *) NULL);
FREE (line);
FREE (expansion);
return TCL_OK;
}
else if (c == 'i' && strncmp (argv[1], "initialize", length) == 0) {
if (argc != 3)
goto BAD_COMMAND;
else
Tcl_AppendResult (interp, TclReadlineInitialize (argv[2]),
(char *) NULL);
}
else if (c == 'w' && strncmp (argv[1], "write", length) == 0) {
if (argc != 3)
goto BAD_COMMAND;
else if (write_history (argv[2]))
Tcl_AppendResult (interp, "unable to write history to \"",
argv[2], "\"\n", (char *) NULL);
}
else if (c == 'a' && strncmp (argv[1], "add", length) == 0) {
if (argc != 3)
goto BAD_COMMAND;
else if (TclReadlineKnownCommands (argv[2], (int) 0, _CMD_SET))
Tcl_AppendResult (interp, "unable to add command \"",
argv[2], "\"\n", (char *) NULL);
}
else if (c == 'c' && strncmp (argv[1], "complete", length) == 0) {
if (argc != 3)
goto BAD_COMMAND;
else if (Tcl_CommandComplete (argv[2]))
Tcl_AppendResult (interp, "1", (char *) NULL);
else
Tcl_AppendResult (interp, "0", (char *) NULL);
}
else
goto BAD_COMMAND;
return TCL_OK;
BAD_COMMAND:
Tcl_AppendResult (interp,
"wrong # args: should be \"readline option ?arg ...?\"",
(char *) NULL);
return TCL_ERROR;
}
void TclReadlineDataAvailableHandler (ClientData clientData, int mask)
{
#if 0
fprintf (stderr, "(TclReadlineDataAvailableHandler) mask = %d\n", mask);
#endif
if (mask & TCL_READABLE) {
rl_callback_read_char ();
rl_redisplay ();
}
}
void TclReadlineLineCompleteHandler (char *ptr)
{
#if 0
fprintf (stderr, "(TclReadlineLineCompleteHandler) ptr = %p\n", ptr);
if (ptr)
fprintf (stderr, "(TclReadlineLineCompleteHandler) *ptr = %p\n", *ptr);
#endif
if (!ptr) { /* <c-d> */
line_complete = LINE_CONTROL_D;
rl_callback_handler_remove ();
} else if (*ptr) {
line_complete = LINE_COMPLETE;
rl_callback_handler_remove ();
line = ptr;
}
}
int Tclreadline_SafeInit (Tcl_Interp *interp)
{
return Tclreadline_Init (interp);
}
int Tclreadline_Init (Tcl_Interp *interp)
{
Tcl_CreateCommand (interp, "::tclreadline::readline", TclReadlineCmd,
(ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);
return Tcl_PkgProvide (interp, "tclreadline", TCLREADLINE_VERSION);
}
char *TclReadlineInitialize (char *historyfile)
{
rl_readline_name = "tclreadline";
using_history ();
/*
* 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))
return "unable to read history file";
else
return "";
}
char **TclReadlineCompletion (char *text, int start, int end)
{
char **matches = (char **) NULL;
static char local_line[BUFSIZ];
strcpy (local_line, rl_line_buffer);
STRIPWHITE (local_line);
/*
fprintf (stderr, "DEBUG> TclReadlineCompletion: text=|%s|\n", text);
fprintf (stderr, "DEBUG> TclReadlineCompletion: start=|%d|\n", start);
fprintf (stderr, "DEBUG> TclReadlineCompletion: end=|%d|\n", end);
*/
if (start == 0 || !strlen (local_line))
matches = completion_matches (text, TclReadline0generator);
else
matches = completion_matches (text, TclReadline1generator);
return matches;
}
char *TclReadline0generator (char *text, int state)
{
return TclReadlineKnownCommands (text, state, _CMD_GET);
}
char *TclReadline1generator (char *text, int state)
{
return TclReadlineKnownCommands (text, state, _CMD_SUB_GET);
}
char *TclReadlineKnownCommands (char *text, int state, int mode)
{
static int len;
static cmds_t *cmds = (cmds_t *) NULL, *new;
char *tmp, *args[256];
int i, argc;
char **name;
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:
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;
break;
case _CMD_SUB_GET:
if (!state) {
int sub;
char *local_line = strdup (rl_line_buffer);
len = strlen (local_line);
STRIPRIGHT (local_line);
if (len != strlen (local_line))
sub = TclReadlineParse (args, sizeof (args), local_line);
else
sub = TclReadlineParse (args,
sizeof (args), local_line) - 1;
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 TclReadlineEventHook (void)
{
Tcl_DoOneEvent (TCL_ALL_EVENTS | TCL_DONT_WAIT);
return TCL_OK;
}
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 ((*buf == ' ') || (*buf == '\t') || (*buf == '\n'))
*buf++ = '\0';
if (!(*buf)) /* don't count the terminating NULL */
break;
*args++ = buf;
nr++;
while ((*buf!='\0') && (*buf!=' ') && (*buf!='\t') && (*buf!='\n'))
buf++;
}
*args = '\0';
return nr;
}