static const char zOptions[] =
@ Command-line options common to all commands:
@
@   --args FILENAME         Read additional arguments and options from FILENAME
@   --case-sensitive BOOL   Set case sensitivity for file names
@   --cgitrace              Active CGI tracing
@   --chdir PATH            Change to PATH before performing any operations
@   --color WHEN            Emit VT color escapes: 'never', 'always', or 'auto'
@   --errorlog FILENAME     Log errors to FILENAME
@   --help                  Show help on the command rather than running it
@   --httptrace             Trace outbound HTTP requests
@   --localtime             Display times using the local timezone
@   --nocgi                 Do not act as CGI
@   --no-th-hook            Do not run TH1 hooks
@   --quiet                 Reduce the amount of output

  const char *zPidKey;    /* Saved value of the --usepidkey option.  Only
                           * applicable when using SEE on Windows or Linux. */
#endif
  int useLocalauth;       /* No login required if from 127.0.0.1 */
  int noPswd;             /* Logged in without password (on 127.0.0.1) */
  int userUid;            /* Integer user id */
  int isHuman;            /* True if access by a human, not a spider or bot */
  int colorOutput;        /* Control output of color VT escapes to CLI */
  int comFmtFlags;        /* Zero or more "COMMENT_PRINT_*" bit flags, should be
                          ** accessed through get_comment_format(). */
  const char *zSockName;  /* Name of the unix-domain socket file */
  const char *zSockMode;  /* File permissions for unix-domain socket */
  const char *zSockOwner; /* Owner, or owner:group for unix-domain socket */

  /* Information used to populate the RCVFROM table */

    }
  }
  fossil_warning("%s", blob_str(&msg));
  blob_reset(&msg);
}

/*
** Initialize the g.comFmtFlags and g.colorOutput global variables.
**
** The global command-line options --comfmtflags or --comment-format to
** set the comment format are undocumented and deprecated, and are only
** for backwards compatibility.
**
** If the --color option isn't found, the NO_COLOR environment variable
** may disable colored output (but is otherwise trumped by the option).
*/
static void fossil_init_flags_from_options(void){
  char *zEnvVar;
  const char *zValue = find_option("comfmtflags", 0, 1);
  if( zValue==0 ){
    zValue = find_option("comment-format", 0, 1);
  }
  if( zValue ){
    g.comFmtFlags = atoi(zValue);
  }else{
    g.comFmtFlags = COMMENT_PRINT_UNSET;   /* Command-line option not found. */
  }
  g.colorOutput = COLOR_VT_UNSET;
  zValue = find_option("color", 0, 1);
  if( zValue ){
    if( fossil_strcmp(zValue,"never")==0 ){
      g.colorOutput = COLOR_VT_NEVER;
    }
    else if( fossil_strcmp(zValue,"always")==0 ){
      g.colorOutput = COLOR_VT_ALWAYS;
    }
    else if( fossil_strcmp(zValue,"auto")==0 ){
      g.colorOutput = COLOR_VT_AUTO;
    }else{
      fossil_fatal("the --color option must be 'never', 'always', or 'auto'");
    }
  }
  if( g.colorOutput==COLOR_VT_UNSET ){
    zEnvVar = fossil_getenv("NO_COLOR");
    if( zEnvVar ){
      if( is_false(zEnvVar) ){
        g.colorOutput = COLOR_VT_NEVER;
      }
      fossil_path_free(zEnvVar);
    }
  }
}

/*
** Check to see if the Fossil binary contains an appended repository
** file using the appendvfs extension.  If so, change command-line arguments
** to cause Fossil to launch with "fossil ui" on that repo.

/*
** Terminal size defined in terms of columns and lines.
*/
struct TerminalSize {
  unsigned int nColumns;         /* Number of characters on a single line */
  unsigned int nLines;           /* Number of lines */
};

/*
** Values of g.ColorOutput to control output of color VT escapes to CLI.
*/
#define COLOR_VT_UNSET   (-1)   /* Not initialized. */
#define COLOR_VT_NEVER    (0)   /* Never emit color VT escapes. */
#define COLOR_VT_ALWAYS   (1)   /* Always emit color VT escapes. */
#define COLOR_VT_AUTO     (2)   /* Only emit color VT escapes on terminal. */
#endif


/* Get the current terminal size by calling a system service.
**
** Return 1 on success. This sets the size parameters to the values retured by
** the system call, when such is supported; set the size to zero otherwise.

  fossil_print("%d %d\n", ts.nColumns, ts.nLines);
}

/*
** Return true if it is reasonable is emit VT100 escape codes.
*/
int terminal_is_vt100(void){
  if( g.colorOutput==COLOR_VT_NEVER) return 0;
  if( g.colorOutput==COLOR_VT_ALWAYS) return 1;
  /* Check the terminal if g.colorOutput is COLOR_VT_UNSET or COLOR_VT_AUTO. */
#ifdef _WIN32
  return win32_terminal_is_vt100(1);
#else /* !_WIN32 */
  return fossil_isatty(1);


#endif /* !_WIN32 */

  return 0;
}

#ifdef _WIN32
/*
** Return true if the Windows console supports VT100 escape codes.
**

most sensible condition.

`--cgitrace`: Active CGI tracing.

`--chdir DIRECTORY`: Change to the named directory before processing
any commands.


`--color WHEN`: Control output of color VT escapes to CLI (supersedes
the `NO_COLOR` environment variable explained later in this document):

  * _never_ — Never emit color VT escapes.

  * _always_ — Always emit color VT escapes; useful when piping
    Fossil command output through a pager utility.

  * _auto_ — Only emit color VT escapes when output goes to a
    terminal, and not if output is redirected to a pipe, a file, or any
    other device.


`--comfmtflags NUMBER`: Specify flags that control how check-in comments
and certain other text outputs are formatted for display. The flags are
individual bits in `NUMBER`, which must be specified in base 10:

  * _0_ — Uses the revised algorithm with no special handling.

`LOGNAME`: Name of the logged in user on many Unix-like platforms.
Used as the fossil user name if `FOSSIL_USER` is not specified. See
the discussion of Fossil Username below for a lot more detail.

`NO_COLOR`: If defined and not set to a `false` value (i.e. "off", "no",
"false", "0"), the `fossil search` command skips colorization of console
output using ANSI escape codes (VT100).
Note the `--color` option takes precedence over the `NO_COLOR` variable.

`PATH`: Used by most platforms to locate programs invoked without a
fully qualified name. Explicitly used by `fossil ui` on certain platforms
to choose the browser to launch.

`PATH_INFO`: If defined, included in error log messages.