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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.
*/
#include "tclInt.h"
#include "tclPort.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(interp, cmd, flags)
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.
*/
Tcl_SetResult(interp, TclGetString(Tcl_GetObjResult(interp)),
TCL_VOLATILE);
/*
* 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(interp, cmdPtr, flags)
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;
Tcl_Obj *list[3];
register Tcl_Obj *objPtr;
/*
* Do recording by eval'ing a tcl history command: history add $cmd.
*/
list[0] = Tcl_NewStringObj("history", -1);
list[1] = Tcl_NewStringObj("add", -1);
list[2] = cmdPtr;
objPtr = Tcl_NewListObj(3, list);
Tcl_IncrRefCount(objPtr);
(void) Tcl_EvalObjEx(interp, objPtr, TCL_EVAL_GLOBAL);
Tcl_DecrRefCount(objPtr);
/*
* Execute the command.
*/
result = TCL_OK;
if (!(flags & TCL_NO_EVAL)) {
result = Tcl_EvalObjEx(interp, cmdPtr, flags & TCL_EVAL_GLOBAL);
}
return result;
}
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