/// <summary>
/// one time initialization: acquire a screen host interface
/// by creating one on top of a file
/// NOTICE: we assume that at this time the file name is
/// available in the CRO. JonN recommends: file name has to be
/// a MANDATORY parameter on the command line
/// </summary>
private LineOutput InstantiateLineOutputInterface()
{
string action = StringUtil.Format(FormatAndOut_out_xxx.OutFile_Action);
if (ShouldProcess(FilePath, action))
{
PathUtils.MasterStreamOpen(
this,
FilePath,
_encoding,
false, // defaultEncoding
Append,
Force,
NoClobber,
out _fs,
out _sw,
out _readOnlyFileInfo,
_isLiteralPath
);
}
else
return null;
// compute the # of columns available
int computedWidth = 120;
if (_width != null)
{
// use the value from the command line
computedWidth = _width.Value;
}
else
{
// use the value we get from the console
try
{
// NOTE: we subtract 1 because we want to properly handle
// the following scenario:
// MSH>get-foo|out-file foo.txt
// MSH>get-content foo.txt
// in this case, if the computed width is (say) 80, get-content
// would cause a wrapping of the 80 column long raw strings.
// Hence we set the width to 79.
computedWidth = this.Host.UI.RawUI.BufferSize.Width - 1;
}
catch (HostException)
{
// non interactive host
}
}
// use the stream writer to create and initialize the Line Output writer
TextWriterLineOutput twlo = new TextWriterLineOutput(_sw, computedWidth, _suppressNewline);
// finally have the ILineOutput interface extracted
return (LineOutput)twlo;
}
/// <summary>
/// one time initialization: acquire a screen host interface
/// by creating one on top of a stream
/// </summary>
private LineOutput InstantiateLineOutputInterface()
{
// set up the streaming text writer
StreamingTextWriter.WriteLineCallback callback = new StreamingTextWriter.WriteLineCallback(this.OnWriteLine);
_writer = new StreamingTextWriter(callback, Host.CurrentCulture);
// compute the # of columns available
int computedWidth = 120;
if (_width != null)
{
// use the value from the command line
computedWidth = _width.Value;
}
else
{
// use the value we get from the console
try
{
// NOTE: we subtract 1 because we want to properly handle
// the following scenario:
// MSH>get-foo|format-table|out-string
// in this case, if the computed width is (say) 80, get-content
// would cause a wrapping of the 80 column long raw strings.
// Hence we set the width to 79.
computedWidth = this.Host.UI.RawUI.BufferSize.Width - 1;
}
catch (HostException)
{
// non interactive host
}
}
// use it to create and initialize the Line Output writer
TextWriterLineOutput twlo = new TextWriterLineOutput(_writer, computedWidth);
// finally have the LineOutput interface extracted
return (LineOutput)twlo;
}