if( zTempFile ){
    blob_write_to_file(&script, zTempFile);
    fossil_print("To see diff, run: tclsh \"%s\"\n", zTempFile);
  }else{
#if defined(FOSSIL_ENABLE_TCL)
    Th_FossilInit(TH_INIT_DEFAULT);
    if( evaluateTclWithEvents(g.interp, &g.tcl, blob_str(&script),
                              blob_size(&script), 1, 0)==TCL_OK ){
      blob_reset(&script);
      return;
    }
    /*
     * If evaluation of the Tcl script fails, the reason may be that Tk
     * could not be found by the loaded Tcl, or that Tcl cannot be loaded
     * dynamically (e.g. x64 Tcl with x86 Fossil).  Therefore, fallback

#ifdef FOSSIL_ENABLE_TCL
/*
** Interfaces to the full Tcl core library from "th_tcl.c".
*/
int th_register_tcl(Th_Interp *, void *);
int unloadTcl(Th_Interp *, void *);
int evaluateTclWithEvents(Th_Interp *, void *, const char *, int, int, int);
#endif

/*
** General purpose hash table from th_lang.c.
*/
typedef struct Th_Hash      Th_Hash;
typedef struct Th_HashEntry Th_HashEntry;

**
** This file contains code used to bridge the TH1 and Tcl scripting languages.
*/
#include "config.h"

#ifdef FOSSIL_ENABLE_TCL

#include "sqlite3.h"
#include "th.h"
#include "tcl.h"

/*
** These macros are designed to reduce the redundant code required to marshal
** arguments from TH1 to Tcl.
*/

*/
#if defined(FOSSIL_ENABLE_TCL_PRIVATE_STUBS)
/*
** HACK: Using some preprocessor magic and a private static variable, redirect
**       the Tcl API calls [found within this file] to the function pointers
**       that will be contained in our private Tcl stubs table.  This takes
**       advantage of the fact that the Tcl headers always define the Tcl API
**       functions in terms of the "tclStubsPtr" variable when the define
**       USE_TCL_STUBS is present during compilation.
*/
#define tclStubsPtr privateTclStubsPtr
static const TclStubs *tclStubsPtr = NULL;

/*
** Create a Tcl interpreter structure that mirrors just enough fields to get
** it up and running successfully with our private implementation of the Tcl

/*
** Creates and initializes a Tcl interpreter for use with the specified TH1
** interpreter.  Stores the created Tcl interpreter in the Tcl context supplied
** by the caller.  This must be declared here because quite a few functions in
** this file need to use it before it can be defined.
*/
static int createTclInterp(Th_Interp *interp, void *pContext);

/*
** Returns a name for a Tcl return code.
*/
static const char *getTclReturnCodeName(
  int rc,
  int nullIfOk
){
  static char zRc[32];

  switch( rc ){
    case TCL_OK:       return nullIfOk ? 0 : "TCL_OK";
    case TCL_ERROR:    return "TCL_ERROR";
    case TCL_BREAK:    return "TCL_BREAK";
    case TCL_RETURN:   return "TCL_RETURN";
    case TCL_CONTINUE: return "TCL_CONTINUE";
    default: {
      sqlite3_snprintf(sizeof(zRc), zRc, "Tcl return code %d", rc);
    }
  }
  return zRc;
}

/*
** Returns the Tcl interpreter result as a string with the associated length.
** If the Tcl interpreter or the Tcl result are NULL, the length will be 0.
** If the length pointer is NULL, the length will not be stored.
*/
static char *getTclResult(

/*
** Evaluate a Tcl script, creating the Tcl interpreter if necessary. If the
** Tcl script succeeds, start a Tcl event loop until there are no more events
** remaining to process -OR- the script calls [exit].  If the bWait argument
** is zero, only process events that are already in the queue; otherwise,
** process events until the script terminates the Tcl event loop.
*/
void fossil_print(const char *zFormat, ...); /* printf.h */

int evaluateTclWithEvents(
  Th_Interp *interp,
  void *pContext,
  const char *zScript,
  int nScript,
  int bWait,
  int bVerbose
){
  struct TclContext *tclContext = (struct TclContext *)pContext;
  Tcl_Interp *tclInterp;
  int rc;
  int flags = TCL_ALL_EVENTS;

  if( createTclInterp(interp, pContext)!=TH_OK ){
    return TH_ERROR;
  }
  tclInterp = tclContext->interp;
  rc = Tcl_EvalEx(tclInterp, zScript, nScript, TCL_EVAL_GLOBAL);
  if( rc!=TCL_OK ){
    if( bVerbose ){
      const char *zResult = getTclResult(tclInterp, 0);
      fossil_print("%s: ", getTclReturnCodeName(rc, 0));
      fossil_print("%s\n", zResult);
    }
    return rc;
  }
  if( !bWait ) flags |= TCL_DONT_WAIT;
  while( Tcl_DoOneEvent(flags) ){
    /* do nothing */
  }
  return rc;
}