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/*
* tclHistory.c --
*
* This module and the Tcl library file history.tcl together implement
* Tcl command history. Tcl_RecordAndEval(Obj) can be called to record
* commands ("events") before they are executed. Commands defined in
* history.tcl may be used to perform history substitutions.
*
* Copyright (c) 1990-1993 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclHistory.c,v 1.11 2008/04/27 22:21:30 dkf Exp $
*/
#include "tclInt.h"
/*
*----------------------------------------------------------------------
*
* Tcl_RecordAndEval --
*
* This procedure adds its command argument to the current list of
* recorded events and then executes the command by calling Tcl_Eval.
*
* Results:
* The return value is a standard Tcl return value, the result of
* executing cmd.
*
* Side effects:
* The command is recorded and executed.
*
*----------------------------------------------------------------------
*/
int
Tcl_RecordAndEval(
Tcl_Interp *interp, /* Token for interpreter in which command will
* be executed. */
const char *cmd, /* Command to record. */
int flags) /* Additional flags. TCL_NO_EVAL means only
* record: don't execute command.
* TCL_EVAL_GLOBAL means use Tcl_GlobalEval
* instead of Tcl_Eval. */
{
register Tcl_Obj *cmdPtr;
int length = strlen(cmd);
int result;
if (length > 0) {
/*
* Call Tcl_RecordAndEvalObj to do the actual work.
*/
cmdPtr = Tcl_NewStringObj(cmd, length);
Tcl_IncrRefCount(cmdPtr);
result = Tcl_RecordAndEvalObj(interp, cmdPtr, flags);
/*
* Move the interpreter's object result to the string result, then
* reset the object result.
*/
(void) Tcl_GetStringResult(interp);
/*
* Discard the Tcl object created to hold the command.
*/
Tcl_DecrRefCount(cmdPtr);
} else {
/*
* An empty string. Just reset the interpreter's result.
*/
Tcl_ResetResult(interp);
result = TCL_OK;
}
return result;
}
/*
*----------------------------------------------------------------------
*
* Tcl_RecordAndEvalObj --
*
* This procedure adds the command held in its argument object to the
* current list of recorded events and then executes the command by
* calling Tcl_EvalObj.
*
* Results:
* The return value is a standard Tcl return value, the result of
* executing the command.
*
* Side effects:
* The command is recorded and executed.
*
*----------------------------------------------------------------------
*/
int
Tcl_RecordAndEvalObj(
Tcl_Interp *interp, /* Token for interpreter in which command will
* be executed. */
Tcl_Obj *cmdPtr, /* Points to object holding the command to
* record and execute. */
int flags) /* Additional flags. TCL_NO_EVAL means record
* only: don't execute the command.
* TCL_EVAL_GLOBAL means evaluate the script
* in global variable context instead of the
* current procedure. */
{
int result, call = 1;
Tcl_Obj *list[3];
register Tcl_Obj *objPtr;
Tcl_CmdInfo info;
/*
* Do not call [history] if it has been replaced by an empty proc
*/
result = Tcl_GetCommandInfo(interp, "history", &info);
if (result && (info.objProc == TclObjInterpProc)) {
Proc *procPtr = (Proc *)(info.objClientData);
call = (procPtr->cmdPtr->compileProc != TclCompileNoOp);
}
if (call) {
/*
* Do recording by eval'ing a tcl history command: history add $cmd.
*/
TclNewLiteralStringObj(list[0], "history");
TclNewLiteralStringObj(list[1], "add");
list[2] = cmdPtr;
objPtr = Tcl_NewListObj(3, list);
Tcl_IncrRefCount(objPtr);
(void) Tcl_EvalObjEx(interp, objPtr, TCL_EVAL_GLOBAL);
Tcl_DecrRefCount(objPtr);
/*
* One possible failure mode above: exceeding a resource limit.
*/
if (Tcl_LimitExceeded(interp)) {
return TCL_ERROR;
}
}
/*
* Execute the command.
*/
result = TCL_OK;
if (!(flags & TCL_NO_EVAL)) {
result = Tcl_EvalObjEx(interp, cmdPtr, flags & TCL_EVAL_GLOBAL);
}
return result;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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