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Overview
Comment:Add the 'array exists' and 'array names' sub-commands to TH1. Add tcl_platform(engine) and tcl_platform(platform) to TH1.
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SHA1: ea7813da5680dafa7a3c60ddd936fde582125312
User & Date: mistachkin 2016-01-18 17:41:20.065
Context
2016-01-18
17:48
Improve some comments. ... (check-in: dda5d11d user: mistachkin tags: trunk)
17:41
Add the 'array exists' and 'array names' sub-commands to TH1. Add tcl_platform(engine) and tcl_platform(platform) to TH1. ... (check-in: ea7813da user: mistachkin tags: trunk)
03:07
Fix the test-content-undelta command. ... (check-in: 78601789 user: drh tags: trunk)
03:05
Update change log. ... (Closed-Leaf check-in: 042dac53 user: mistachkin tags: tclPlatform)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/th.c. 
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/*
** The implementation of the TH core. This file contains the parser, and
** the implementation of the interface in th.h.
*/

#include "config.h"
#include "th.h"
#include <string.h>
#include <assert.h>





















typedef struct Th_Command        Th_Command;
typedef struct Th_Frame          Th_Frame;
typedef struct Th_Variable       Th_Variable;
typedef struct Th_InterpAndList  Th_InterpAndList;

/*











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/*
** The implementation of the TH core. This file contains the parser, and
** the implementation of the interface in th.h.
*/

#include "config.h"
#include "th.h"
#include <string.h>
#include <assert.h>

/*
** Values used for element values in the tcl_platform array.
*/

#if !defined(TH_ENGINE)
#  define TH_ENGINE          "TH1"
#endif

#if !defined(TH_PLATFORM)
#  if defined(_WIN32) || defined(WIN32)
#    define TH_PLATFORM      "windows"
#  else
#    define TH_PLATFORM      "unix"
#  endif
#endif

/*
** Forward declarations for structures defined below.
*/

typedef struct Th_Command        Th_Command;
typedef struct Th_Frame          Th_Frame;
typedef struct Th_Variable       Th_Variable;
typedef struct Th_InterpAndList  Th_InterpAndList;

/*
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/*
** Return true if variable (zVar, nVar) exists.
*/
int Th_ExistsVar(Th_Interp *interp, const char *zVar, int nVar){
  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
  return pValue && (pValue->zData || pValue->pHash);
}









/*
** String (zVar, nVar) must contain the name of a scalar variable or
** array member. If the variable does not exist it is created. The
** variable is set to the value supplied in string (zValue, nValue).
**
** If (zVar, nVar) refers to an existing array, TH_ERROR is returned








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/*
** Return true if variable (zVar, nVar) exists.
*/
int Th_ExistsVar(Th_Interp *interp, const char *zVar, int nVar){
  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
  return pValue && (pValue->zData || pValue->pHash);
}

/*
** Return true if array variable (zVar, nVar) exists.
*/
int Th_ExistsArrayVar(Th_Interp *interp, const char *zVar, int nVar){
  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
  return pValue && !pValue->zData && pValue->pHash;
}

/*
** String (zVar, nVar) must contain the name of a scalar variable or
** array member. If the variable does not exist it is created. The
** variable is set to the value supplied in string (zValue, nValue).
**
** If (zVar, nVar) refers to an existing array, TH_ERROR is returned
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  Th_Free(interp, *pzStr);
  *pzStr = zNew;
  *pnStr = nNew;

  return TH_OK;
}













/*
** Delete an interpreter.
*/
void Th_DeleteInterp(Th_Interp *interp){
  assert(interp->pFrame);
  assert(0==interp->pFrame->pCaller);








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  Th_Free(interp, *pzStr);
  *pzStr = zNew;
  *pnStr = nNew;

  return TH_OK;
}

/*
** Initialize an interpreter.
*/
static int thInitialize(Th_Interp *interp){
  assert(interp->pFrame);

  Th_SetVar(interp, (char *)"::tcl_platform(engine)", -1, TH_ENGINE, -1);
  Th_SetVar(interp, (char *)"::tcl_platform(platform)", -1, TH_PLATFORM, -1);

  return TH_OK;
}

/*
** Delete an interpreter.
*/
void Th_DeleteInterp(Th_Interp *interp){
  assert(interp->pFrame);
  assert(0==interp->pFrame->pCaller);
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  /* Allocate and initialise the interpreter and the global frame */
  p = pVtab->xMalloc(sizeof(Th_Interp) + sizeof(Th_Frame));
  memset(p, 0, sizeof(Th_Interp));
  p->pVtab = pVtab;
  p->paCmd = Th_HashNew(p);
  thPushFrame(p, (Th_Frame *)&p[1]);


  return p;
}

/*
** These two types are used only by the expression module, where
** the expression module means the Th_Expr() and exprXXX() functions.








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  /* Allocate and initialise the interpreter and the global frame */
  p = pVtab->xMalloc(sizeof(Th_Interp) + sizeof(Th_Frame));
  memset(p, 0, sizeof(Th_Interp));
  p->pVtab = pVtab;
  p->paCmd = Th_HashNew(p);
  thPushFrame(p, (Th_Frame *)&p[1]);
  thInitialize(p);

  return p;
}

/*
** These two types are used only by the expression module, where
** the expression module means the Th_Expr() and exprXXX() functions.
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    Th_HashIterate(interp, pFrame->paVar, thListAppendHashKey, p);
    Th_Free(interp, p);
    return TH_OK;
  }else{
    return TH_ERROR;
  }
}





































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    Th_HashIterate(interp, pFrame->paVar, thListAppendHashKey, p);
    Th_Free(interp, p);
    return TH_OK;
  }else{
    return TH_ERROR;
  }
}

/*
** Appends all array element names for the specified array variable to the
** specified list and returns TH_OK upon success.  Any other return value
** indicates an error.
*/
int Th_ListAppendArray(
  Th_Interp *interp,
  const char *zVar,       /* Pointer to variable name */
  int nVar,               /* Number of bytes at nVar */
  char **pzList,          /* OUT: List of array element names */
  int *pnList             /* OUT: Number of array element names */
){
  Th_Variable *pValue = thFindValue(interp, zVar, nVar, 0, 1, 1, 0);
  if( pValue && !pValue->zData && pValue->pHash ){
    Th_InterpAndList *p = (Th_InterpAndList *)Th_Malloc(
      interp, sizeof(Th_InterpAndList)
    );
    p->interp = interp;
    p->pzList = pzList;
    p->pnList = pnList;
    Th_HashIterate(interp, pValue->pHash, thListAppendHashKey, p);
    Th_Free(interp, p);
  }else{
    *pzList = 0;
    *pnList = 0;
  }
  return TH_OK;
}
Changes to src/th.h.
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int Th_Expr(Th_Interp *interp, const char *, int);

/*
** Access TH variables in the current stack frame. If the variable name
** begins with "::", the lookup is in the top level (global) frame.
*/
int Th_ExistsVar(Th_Interp *, const char *, int);

int Th_GetVar(Th_Interp *, const char *, int);
int Th_SetVar(Th_Interp *, const char *, int, const char *, int);
int Th_LinkVar(Th_Interp *, const char *, int, int, const char *, int);
int Th_UnsetVar(Th_Interp *, const char *, int);

typedef int (*Th_CommandProc)(Th_Interp *, void *, int, const char **, int *);









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int Th_Expr(Th_Interp *interp, const char *, int);

/*
** Access TH variables in the current stack frame. If the variable name
** begins with "::", the lookup is in the top level (global) frame.
*/
int Th_ExistsVar(Th_Interp *, const char *, int);
int Th_ExistsArrayVar(Th_Interp *, const char *, int);
int Th_GetVar(Th_Interp *, const char *, int);
int Th_SetVar(Th_Interp *, const char *, int, const char *, int);
int Th_LinkVar(Th_Interp *, const char *, int, int, const char *, int);
int Th_UnsetVar(Th_Interp *, const char *, int);

typedef int (*Th_CommandProc)(Th_Interp *, void *, int, const char **, int *);
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int Th_SetResultDouble(Th_Interp *, double);

/*
** Functions for handling command and variable introspection.
*/
int Th_ListAppendCommands(Th_Interp *, char **, int *);
int Th_ListAppendVariables(Th_Interp *, char **, int *);


/*
** Drop in replacements for the corresponding standard library functions.
*/
int th_strlen(const char *);
int th_isdigit(char);
int th_isspace(char);








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int Th_SetResultDouble(Th_Interp *, double);

/*
** Functions for handling command and variable introspection.
*/
int Th_ListAppendCommands(Th_Interp *, char **, int *);
int Th_ListAppendVariables(Th_Interp *, char **, int *);
int Th_ListAppendArray(Th_Interp *, const char *, int, char **, int *);

/*
** Drop in replacements for the corresponding standard library functions.
*/
int th_strlen(const char *);
int th_isdigit(char);
int th_isspace(char);
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  Th_SetResult(interp, zElem, nElem);
  if( zElem ) Th_Free(interp, zElem);
  return TH_OK;
}

/*
** TH Syntax:










































**
**   unset VAR
*/
static int unset_command(
  Th_Interp *interp,
  void *ctx,
  int argc,








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  Th_SetResult(interp, zElem, nElem);
  if( zElem ) Th_Free(interp, zElem);
  return TH_OK;
}

/*
** TH Syntax:
**
**   array exists VARNAME
*/
static int array_exists_command(
  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
){
  int rc;

  if( argc!=3 ){
    return Th_WrongNumArgs(interp, "array exists var");
  }
  rc = Th_ExistsArrayVar(interp, argv[2], argl[2]);
  Th_SetResultInt(interp, rc);
  return TH_OK;
}

/*
** TH Syntax:
**
**   array names
*/
static int array_names_command(
  Th_Interp *interp, void *ctx, int argc, const char **argv, int *argl
){
  int rc;
  char *zElem = 0;
  int nElem = 0;

  if( argc!=3 ){
    return Th_WrongNumArgs(interp, "array names varname");
  }
  rc = Th_ListAppendArray(interp, argv[2], argl[2], &zElem, &nElem);
  if( rc!=TH_OK ){
    return rc;
  }
  Th_SetResult(interp, zElem, nElem);
  if( zElem ) Th_Free(interp, zElem);
  return TH_OK;
}

/*
** TH Syntax:
**
**   unset VAR
*/
static int unset_command(
  Th_Interp *interp,
  void *ctx,
  int argc,
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  int *argl
){
  static const Th_SubCommand aSub[] = {
    { "commands", info_commands_command },
    { "exists",   info_exists_command },
    { "vars",     info_vars_command },
    { 0, 0 }





















  };
  return Th_CallSubCommand(interp, ctx, argc, argv, argl, aSub);
}

/*
** Convert the script level frame specification (used by the commands
** [uplevel] and [upvar]) in (zFrame, nFrame) to an integer frame as








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  int *argl
){
  static const Th_SubCommand aSub[] = {
    { "commands", info_commands_command },
    { "exists",   info_exists_command },
    { "vars",     info_vars_command },
    { 0, 0 }
  };
  return Th_CallSubCommand(interp, ctx, argc, argv, argl, aSub);
}

/*
** TH Syntax:
**
**   array exists VARNAME
**   array names VARNAME
*/
static int array_command(
  Th_Interp *interp,
  void *ctx,
  int argc,
  const char **argv,
  int *argl
){
  static const Th_SubCommand aSub[] = {
    { "exists", array_exists_command },
    { "names",  array_names_command },
    { 0, 0 }
  };
  return Th_CallSubCommand(interp, ctx, argc, argv, argl, aSub);
}

/*
** Convert the script level frame specification (used by the commands
** [uplevel] and [upvar]) in (zFrame, nFrame) to an integer frame as
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int th_register_language(Th_Interp *interp){
  /* Array of built-in commands. */
  struct _Command {
    const char *zName;
    Th_CommandProc xProc;
    void *pContext;
  } aCommand[] = {

    {"catch",    catch_command,   0},
    {"expr",     expr_command,    0},
    {"for",      for_command,     0},
    {"if",       if_command,      0},
    {"info",     info_command,    0},
    {"lindex",   lindex_command,  0},
    {"list",     list_command,    0},








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int th_register_language(Th_Interp *interp){
  /* Array of built-in commands. */
  struct _Command {
    const char *zName;
    Th_CommandProc xProc;
    void *pContext;
  } aCommand[] = {
    {"array",    array_command,   0},
    {"catch",    catch_command,   0},
    {"expr",     expr_command,    0},
    {"for",      for_command,     0},
    {"if",       if_command,      0},
    {"info",     info_command,    0},
    {"lindex",   lindex_command,  0},
    {"list",     list_command,    0},
︙︙
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  test th1-info-commands-1 {$RESULT eq {linecount htmlize date stime\
      enable_output uplevel dir http expr glob_match utime styleFooter encode64\
      catch if tclReady searchable reinitialize combobox lindex tclIsSafe query\
      html anoncap randhex llength for set break regexp markdown styleHeader\
      puts return checkout decorate artifact trace wiki proc tclInvoke hascap\
      globalState continue getParameter hasfeature setting lsearch breakpoint\
      upvar render repository string unset setParameter list error info rename\
      tclExpr anycap tclEval httpize tclMakeSafe}}
} else {
  test th1-info-commands-1 {$RESULT eq {linecount htmlize date stime\
      enable_output uplevel dir http expr glob_match utime styleFooter encode64\
      catch if tclReady searchable reinitialize combobox lindex query html\
      anoncap randhex llength for set break regexp markdown styleHeader puts\
      return checkout decorate artifact trace wiki proc hascap globalState\
      continue getParameter hasfeature setting lsearch breakpoint upvar render\
      repository string unset setParameter list error info rename anycap\
      httpize}}
}

###############################################################################

fossil test-th-eval "info vars"

if {$th1Hooks} {
  test th1-info-vars-1 {$RESULT eq \
      "th_stack_trace cmd_flags cmd_name cmd_args"}
} else {
  test th1-info-vars-1 {$RESULT eq ""}
}

###############################################################################

fossil test-th-eval "set x 1; info vars"

if {$th1Hooks} {
  test th1-info-vars-2 {$RESULT eq \
      "x th_stack_trace cmd_flags cmd_name cmd_args"}
} else {
  test th1-info-vars-2 {$RESULT eq "x"}
}

###############################################################################

fossil test-th-eval "set x 1; unset x; info vars"

if {$th1Hooks} {
  test th1-info-vars-3 {$RESULT eq \
      "th_stack_trace cmd_flags cmd_name cmd_args"}
} else {
  test th1-info-vars-3 {$RESULT eq ""}
}

###############################################################################

fossil test-th-eval "proc foo {} {set x 1; info vars}; foo"
test th1-info-vars-4 {$RESULT eq "x"}

###############################################################################

fossil test-th-eval "set y 1; proc foo {} {set x 1; uplevel 1 {info vars}}; foo"

if {$th1Hooks} {
  test th1-info-vars-5 {$RESULT eq \
      "th_stack_trace y cmd_flags cmd_name cmd_args"}
} else {
  test th1-info-vars-5 {$RESULT eq "y"}
}
























































###############################################################################

fossil test-th-eval "lsearch"
test th1-lsearch-1 {$RESULT eq \
    {TH_ERROR: wrong # args: should be "lsearch list string"}}









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  test th1-info-commands-1 {$RESULT eq {linecount htmlize date stime\
      enable_output uplevel dir http expr glob_match utime styleFooter encode64\
      catch if tclReady searchable reinitialize combobox lindex tclIsSafe query\
      html anoncap randhex llength for set break regexp markdown styleHeader\
      puts return checkout decorate artifact trace wiki proc tclInvoke hascap\
      globalState continue getParameter hasfeature setting lsearch breakpoint\
      upvar render repository string unset setParameter list error info rename\
      tclExpr array anycap tclEval httpize tclMakeSafe}}
} else {
  test th1-info-commands-1 {$RESULT eq {linecount htmlize date stime\
      enable_output uplevel dir http expr glob_match utime styleFooter encode64\
      catch if tclReady searchable reinitialize combobox lindex query html\
      anoncap randhex llength for set break regexp markdown styleHeader puts\
      return checkout decorate artifact trace wiki proc hascap globalState\
      continue getParameter hasfeature setting lsearch breakpoint upvar render\
      repository string unset setParameter list error info rename array anycap\
      httpize}}
}

###############################################################################

fossil test-th-eval "info vars"

if {$th1Hooks} {
  test th1-info-vars-1 {$RESULT eq \
      "th_stack_trace cmd_flags tcl_platform cmd_name cmd_args"}
} else {
  test th1-info-vars-1 {$RESULT eq "tcl_platform"}
}

###############################################################################

fossil test-th-eval "set x 1; info vars"

if {$th1Hooks} {
  test th1-info-vars-2 {$RESULT eq \
      "x th_stack_trace cmd_flags tcl_platform cmd_name cmd_args"}
} else {
  test th1-info-vars-2 {$RESULT eq "x tcl_platform"}
}

###############################################################################

fossil test-th-eval "set x 1; unset x; info vars"

if {$th1Hooks} {
  test th1-info-vars-3 {$RESULT eq \
      "th_stack_trace cmd_flags tcl_platform cmd_name cmd_args"}
} else {
  test th1-info-vars-3 {$RESULT eq "tcl_platform"}
}

###############################################################################

fossil test-th-eval "proc foo {} {set x 1; info vars}; foo"
test th1-info-vars-4 {$RESULT eq "x"}

###############################################################################

fossil test-th-eval "set y 1; proc foo {} {set x 1; uplevel 1 {info vars}}; foo"

if {$th1Hooks} {
  test th1-info-vars-5 {$RESULT eq \
      "th_stack_trace y cmd_flags tcl_platform cmd_name cmd_args"}
} else {
  test th1-info-vars-5 {$RESULT eq "y tcl_platform"}
}

###############################################################################

fossil test-th-eval "array exists foo"
test th1-array-exists-1 {$RESULT eq "0"}

###############################################################################

fossil test-th-eval "set foo(x) 1; array exists foo"
test th1-array-exists-2 {$RESULT eq "1"}

###############################################################################

fossil test-th-eval "set foo(x) 1; unset foo(x); array exists foo"
test th1-array-exists-3 {$RESULT eq "1"}

###############################################################################

fossil test-th-eval "set foo(x) 1; unset foo; array exists foo"
test th1-array-exists-4 {$RESULT eq "0"}

###############################################################################

fossil test-th-eval "set foo 1; array exists foo"
test th1-array-exists-5 {$RESULT eq "0"}

###############################################################################

fossil test-th-eval "array names foo"
test th1-array-names-1 {$RESULT eq ""}

###############################################################################

fossil test-th-eval "set foo 2; array names foo"
test th1-array-names-2 {$RESULT eq ""}

###############################################################################

fossil test-th-eval "set foo 2; unset foo; set foo(x) 2; array names foo"
test th1-array-names-3 {$RESULT eq "x"}

###############################################################################

fossil test-th-eval "set foo(x) 2; array names foo"
test th1-array-names-4 {$RESULT eq "x"}

###############################################################################

fossil test-th-eval "set foo(x) 2; set foo(y) 2; array names foo"
test th1-array-names-5 {$RESULT eq "x y"}

###############################################################################

fossil test-th-eval "set foo(x) 2; unset foo(x); array names foo"
test th1-array-names-6 {$RESULT eq ""}

###############################################################################

fossil test-th-eval "lsearch"
test th1-lsearch-1 {$RESULT eq \
    {TH_ERROR: wrong # args: should be "lsearch list string"}}
︙︙
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run_in_checkout {
  fossil test-th-eval --open-config \
      {encode64 [artifact trunk ajax/cgi-bin/fossil-json.cgi.example]}
}

test th1-encode64-3 {$RESULT eq \
"IyEvcGF0aC90by9mb3NzaWwvYmluYXJ5CnJlcG9zaXRvcnk6IC9wYXRoL3RvL3JlcG8uZnNsCg=="}




























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run_in_checkout {
  fossil test-th-eval --open-config \
      {encode64 [artifact trunk ajax/cgi-bin/fossil-json.cgi.example]}
}

test th1-encode64-3 {$RESULT eq \
"IyEvcGF0aC90by9mb3NzaWwvYmluYXJ5CnJlcG9zaXRvcnk6IC9wYXRoL3RvL3JlcG8uZnNsCg=="}

###############################################################################

fossil test-th-eval {array exists tcl_platform}
test th1-platform-1 {$RESULT eq "1"}

###############################################################################

fossil test-th-eval {array names tcl_platform}
test th1-platform-2 {$RESULT eq "engine platform"}

###############################################################################

fossil test-th-eval {set tcl_platform(engine)}
test th1-platform-3 {$RESULT eq "TH1"}

###############################################################################

fossil test-th-eval {set tcl_platform(platform)}
test th1-platform-4 {$RESULT eq "windows" || $RESULT eq "unix"}
Changes to www/changes.wiki.
︙︙
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  *  Added the --page option to the [/help?cmd=ui|fossil ui] command
  *  Added the [/help?cmd=bisect|fossil bisect ui] command
  *  Enhanced the [/help?cmd=diff|fossil diff] command so that it accepts 
     directory names as arguments and computes diffs on all files contained
     within those directories.
  *  Fix the [/help?cmd=add|fossil add] command so that it shows "SKIP" for
     files added that were already under management.







<h2>Changes for Version 1.34 (2015-11-02)</h2>

  *  Make the [/help?cmd=clean|fossil clean] command undoable for files less
     than 10MiB.
  *  Update internal Unicode character tables, used in regular expression
     handling, from version 7.0 to 8.0.








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  *  Added the --page option to the [/help?cmd=ui|fossil ui] command
  *  Added the [/help?cmd=bisect|fossil bisect ui] command
  *  Enhanced the [/help?cmd=diff|fossil diff] command so that it accepts 
     directory names as arguments and computes diffs on all files contained
     within those directories.
  *  Fix the [/help?cmd=add|fossil add] command so that it shows "SKIP" for
     files added that were already under management.
  *  TH1 enhancements:
     <ul><li>Add <nowiki>[array exists]</nowiki> command.</li>
     <li>Add minimal <nowiki>[array names]</nowiki> command.</li>
     <li>Add tcl_platform(engine) and tcl_platform(platform) array
     elements.</li>
     </ul>

<h2>Changes for Version 1.34 (2015-11-02)</h2>

  *  Make the [/help?cmd=clean|fossil clean] command undoable for files less
     than 10MiB.
  *  Update internal Unicode character tables, used in regular expression
     handling, from version 7.0 to 8.0.
︙︙
Changes to www/th1.md.
︙︙
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----------------------------

The original Tcl language after when TH1 is modeled has a very rich
repertoire of commands.  TH1, as it is designed to be minimalist and
embedded has a greatly reduced command set.  The following bullets
summarize the commands available in TH1:



  *  break
  *  catch SCRIPT ?VARIABLE?
  *  continue
  *  error ?STRING?
  *  expr EXPR
  *  for INIT-SCRIPT TEST-EXPR NEXT-SCRIPT BODY-SCRIPT
  *  if EXPR SCRIPT (elseif EXPR SCRIPT)* ?else SCRIPT?








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----------------------------

The original Tcl language after when TH1 is modeled has a very rich
repertoire of commands.  TH1, as it is designed to be minimalist and
embedded has a greatly reduced command set.  The following bullets
summarize the commands available in TH1:

  *  array exists VARNAME
  *  array names VARNAME
  *  break
  *  catch SCRIPT ?VARIABLE?
  *  continue
  *  error ?STRING?
  *  expr EXPR
  *  for INIT-SCRIPT TEST-EXPR NEXT-SCRIPT BODY-SCRIPT
  *  if EXPR SCRIPT (elseif EXPR SCRIPT)* ?else SCRIPT?
︙︙
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All of the above commands work as in the original Tcl.  Refer to the
<a href="https://www.tcl-lang.org/man/tcl/contents.htm">Tcl documentation</a>
for details.

Summary of Core TH1 Variables
-----------------------------



  *  th\_stack\_trace -- _This will contain error stack information._

TH1 Extended Commands
---------------------

There are many new commands added to TH1 and used to access the special
features of Fossil.  The following is a summary of the extended commands:








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All of the above commands work as in the original Tcl.  Refer to the
<a href="https://www.tcl-lang.org/man/tcl/contents.htm">Tcl documentation</a>
for details.

Summary of Core TH1 Variables
-----------------------------

  *  tcl\_platform(engine) -- _This will always have the value "TH1"._
  *  tcl\_platform(platform) -- _This will have the value "windows" or "unix"._
  *  th\_stack\_trace -- _This will contain error stack information._

TH1 Extended Commands
---------------------

There are many new commands added to TH1 and used to access the special
features of Fossil.  The following is a summary of the extended commands:
︙︙