Fossil

/*
** SETTING: tcl-setup        width=40 versionable block-text
** This is the setup script to be evaluated after creating
** and initializing the Tcl interpreter.  By default, this
** is empty and no extra setup is performed.
*/
#endif /* FOSSIL_ENABLE_TCL */
/*
** SETTING: tclsh            width=80 default=tclsh
** Name of the external TCL interpreter used for such things
** as running the GUI diff viewer launched by the --tk option
** of the various "diff" commands.
*/
#ifdef FOSSIL_ENABLE_TH1_DOCS
/*
** SETTING: th1-docs         boolean default=off
** If enabled, this allows embedded documentation files to contain
** arbitrary TH1 scripts that are evaluated on the server.  If native
** Tcl integration is also enabled, this setting has the
** potential to allow anybody with check-in privileges to

** (3) Delete the temp file.
*/
void diff_tk(const char *zSubCmd, int firstArg){
  int i;
  Blob script;
  const char *zTempFile = 0;
  char *zCmd;
  const char *zTclsh;
  blob_zero(&script);
  blob_appendf(&script, "set fossilcmd {| \"%/\" %s --html -y -i -v",
               g.nameOfExe, zSubCmd);
  find_option("html",0,0);
  find_option("side-by-side","y",0);
  find_option("internal","i",0);
  find_option("verbose","v",0);
  zTclsh = find_option("tclsh",0,1);
  if( zTclsh==0 ){
    zTclsh = db_get("tclsh","tclsh");
  }
  /* The undocumented --script FILENAME option causes the Tk script to
  ** be written into the FILENAME instead of being run.  This is used
  ** for testing and debugging. */
  zTempFile = find_option("script",0,1);
  for(i=firstArg; i<g.argc; i++){
    const char *z = g.argv[i];
    if( sqlite3_strglob("*}*",z) ){
      blob_appendf(&script, " {%/}", z);
    }else{
      int j;
      blob_append(&script, " ", 1);
      for(j=0; z[j]; j++) blob_appendf(&script, "\\%03o", (unsigned char)z[j]);
    }
  }
  blob_appendf(&script, "}\n%s", builtin_file("diff.tcl", 0));
  if( zTempFile ){
    blob_write_to_file(&script, zTempFile);
    fossil_print("To see diff, run: %s \"%s\"\n", zTclsh, 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, 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
     * to using the external "tclsh", if available.
     */
#endif
    zTempFile = write_blob_to_temp_file(&script);
    zCmd = mprintf("\"%s\" \"%s\"", zTclsh, zTempFile);
    fossil_system(zCmd);
    file_delete(zTempFile);
    fossil_free(zCmd);
  }
  blob_reset(&script);
}

**   --exec-rel-paths           Force relative path names with external commands.
**   --from|-r VERSION          Select VERSION as source for the diff
**   --internal|-i              Use internal diff logic
**   --new-file|-N              Show complete text of added and deleted files
**   --numstat                  Show only the number of lines delete and added
**   --side-by-side|-y          Side-by-side diff
**   --strip-trailing-cr        Strip trailing CR
**   --tclsh PATH               Tcl/Tk used for --tk (default: "tclsh")
**   --tk                       Launch a Tcl/Tk GUI for display
**   --to VERSION               Select VERSION as target for the diff
**   --undo                     Diff against the "undo" buffer
**   --unified                  Unified diff
**   -v|--verbose               Output complete text of added or deleted files
**   -w|--ignore-all-space      Ignore white space when comparing lines
**   -W|--width <num>           Width of lines in side-by-side diff