/* ==================================================================
FILE: "/home/joze/src/tclreadline/tclreadline.c"
LAST MODIFICATION: "Sat Aug 28 23:56:10 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); 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);
char* TclReadlineQuote(char* text, char* quotechars);
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);
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,
LINE_EOF,
LINE_COMPLETE
};
/**
* global variables
*/
static int tclrl_line_complete = LINE_PENDING;
static int tclrl_state = TCL_OK;
static char* tclrl_eof_string = (char*) NULL;
static char* tclrl_line = (char*) NULL;
static char* tclrl_custom_completer = (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;
}
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, /* 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)
goto BAD_COMMAND;
c = argv[1][0];
length = strlen(argv[1]);
if (c == 'r' && strncmp(argv[1], "read", length) == 0) {
char* expansion = (char*) NULL;
int status;
tclrl_line_complete = LINE_PENDING;
tclrl_state = TCL_OK;
rl_callback_handler_install(argc == 3 ? argv[2] : "%",
TclReadlineLineCompleteHandler);
Tcl_CreateFileHandler(0, TCL_READABLE,
TclReadlineDataAvailableHandler, (ClientData) NULL);
while (LINE_PENDING == tclrl_line_complete
&& TCL_OK == tclrl_state && !rl_done) {
Tcl_DoOneEvent(0);
/*
rl_inhibit_completion = 0;
*/
}
Tcl_DeleteFileHandler(0);
if ((LINE_EOF == tclrl_line_complete) && tclrl_eof_string) {
Tcl_Eval(interp, tclrl_eof_string);
return tclrl_state;
}
status = history_expand(tclrl_line, &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
printf("%s\n", expansion);
#endif
}
else if (status == -1) {
Tcl_AppendResult
(interp, "error in history expansion\n", (char*) NULL);
return TCL_ERROR;
}
/**
* TODO: status == 2 ...
*/
if (expansion && *expansion)
add_history(expansion);
Tcl_AppendResult(interp, expansion, (char*) NULL);
FREE(tclrl_line);
FREE(expansion);
return tclrl_state;
} else if (c == 'i' && strncmp(argv[1], "initialize", length) == 0) {
if (3 != argc)
goto BAD_COMMAND;
else
return TclReadlineInitialize(interp, argv[2]);
} else if (c == 'w' && strncmp(argv[1], "write", length) == 0) {
if (3 != argc) {
goto BAD_COMMAND;
} 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;
} else if (c == 'a' && strncmp(argv[1], "add", length) == 0) {
if (3 != argc)
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 (3 != argc)
goto BAD_COMMAND;
else if (Tcl_CommandComplete(argv[2]))
Tcl_AppendResult(interp, "1", (char*) NULL);
else
Tcl_AppendResult(interp, "0", (char*) NULL);
} else if (c == 'c' && strncmp(argv[1], "customcompleter", length) == 0) {
if (3 != argc && 2 != argc)
goto BAD_COMMAND;
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);
} else if (c == 'b' && strncmp(argv[1], "builtincompleter", length) == 0) {
int bool = tclrl_use_builtin_completer;
if (3 != argc && 2 != argc)
goto BAD_COMMAND;
if (3 == argc) {
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);
} else if (c == 'e' && strncmp(argv[1], "eofchar", length) == 0) {
if (3 != argc && 2 != argc)
goto BAD_COMMAND;
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);
} 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();
}
}
void
TclReadlineLineCompleteHandler(char* ptr)
{
#if 1
if (!ptr) { /* <c-d> */
tclrl_line_complete = LINE_EOF;
rl_callback_handler_remove();
} else if (*ptr) {
tclrl_line_complete = LINE_COMPLETE;
rl_callback_handler_remove();
tclrl_line = ptr;
}
#else
if (ptr && *ptr) {
tclrl_line_complete = 1;
rl_callback_handler_remove ();
tclrl_line = ptr;
}
#endif
}
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;
status = Tcl_LinkVar
(interp, "::tclreadline::historyLength",
(char*) &tclrl_history_length, TCL_LINK_INT);
if (TCL_OK != status)
return status;
return Tcl_PkgProvide(interp, "tclreadline", TCLREADLINE_VERSION);
}
int
TclReadlineInitialize(Tcl_Interp* interp, char* historyfile)
{
rl_readline_name = "tclreadline";
/* rl_special_prefixes = "${\""; */
rl_special_prefixes = "${";
/**
* default is " \t\n\"\\'`@$><=;|&{("
* removed "{("
* added "[]}"
*/
rl_basic_word_break_characters = " \t\n\"\\'`@$><=;|&[]}";
/* rl_completer_quote_characters = "\""; */
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;
#if 0
fprintf(stderr, "DEBUG> TclReadlineCompletion: text=|%s|\n", text);
fprintf(stderr, "DEBUG> TclReadlineCompletion: start=|%d|\n", start);
fprintf(stderr, "DEBUG> TclReadlineCompletion: end=|%d|\n", end);
#endif
#if 0
char* history_event = (char*) NULL;
if (text) {
if ('!' == text[0])
history_event = strdup(text);
else if (start && rl_line_buffer[start - 1] == '!' /* for '$' */) {
int len = strlen(text);
history_event = strncpy((char*) malloc(sizeof(char) * (len + 1)),
rl_line_buffer[start - 1], len);
history_event[len] = '\0'; /* terminate */
}
}
if (history_event)
#endif
if (text && ('!' == text[0]
|| (start && rl_line_buffer[start - 1] == '!' /* for '$' */))) {
char* expansion = (char*) NULL;
int oldlen = strlen(rl_line_buffer);
int 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);
/* rl_redisplay(); */
/*
* 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;
char* quoted_text = TclReadlineQuote(text, "$[]{}\"");
char* quoted_rl_line_buffer
= TclReadlineQuote(rl_line_buffer, "$[]{}\"");
#if 0
fprintf (stderr, "(TclReadlineCompletion) rl_line_buffer = |%s|\n",
rl_line_buffer);
fprintf (stderr, "(TclReadlineCompletion) quoted_rl_line_buffer = |%s|\n",
quoted_rl_line_buffer);
fprintf (stderr, "(TclReadlineCompletion) text = |%s|\n", text);
fprintf (stderr, "(TclReadlineCompletion) quoted_text = |%s|\n",
quoted_text);
#endif
sprintf(start_s, "%d", start);
sprintf(end_s, "%d", end);
Tcl_ResetResult(tclrl_interp); /* clear result space */
tclrl_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 != tclrl_state) {
fprintf(stderr, "%s\n", Tcl_GetStringResult(tclrl_interp));
#if 0
Tcl_AppendResult (tclrl_interp, "`", tclrl_custom_completer,
" {", text, "} ", start_s, " ", end_s,
" {", rl_line_buffer, "}' failed.", (char*) NULL);
#endif
return matches;
}
obj = Tcl_GetObjResult(tclrl_interp);
Tcl_ListObjGetElements(tclrl_interp, obj, &objc, &objv);
/* fprintf (stderr, "(TclReadlineCompletion) objc = %d\n", objc); */
if (objc) {
int i, length /* not used */;
matches = (char**) MALLOC(sizeof(char*) * (objc + 1));
for (i = 0; i < objc; i++) {
matches[i] = strdup(Tcl_GetStringFromObj(objv[i], &length));
/*
fprintf (stderr, "(TclReadlineCompletion) matches[%d] = |%s|\n",
i, matches[i]);
*/
}
matches[i] = (char*) NULL; /* terminate */
}
Tcl_ResetResult(tclrl_interp); /* clear result space */
}
if (!matches && tclrl_use_builtin_completer) {
matches = completion_matches(text, TclReadline0generator);
}
#if 0
{
char **ptr;
for (ptr = matches; ptr && *ptr; ptr++)
fprintf (stderr, "(TclReadlineCompletion) |%s|\n", *ptr);
}
#endif
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);
/*
* fprintf (stderr, "(TclReadlineKnownCommands) state=%d\n", state);
* fprintf (stderr, "(TclReadlineKnownCommands) text = |%s|\n", text);
*/
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;
}