/// <summary>Read standard Git environment variables and configure from those.</summary>
/// <remarks>
/// Read standard Git environment variables and configure from those.
/// <p>
/// This method tries to read the standard Git environment variables, such as
/// <code>GIT_DIR</code>
/// and
/// <code>GIT_WORK_TREE</code>
/// to configure this builder
/// instance. If a property is already set in the builder, the environment
/// variable is not used.
/// </remarks>
/// <param name="sr">the SystemReader abstraction to access the environment.</param>
/// <returns>
///
/// <code>this</code>
/// (for chaining calls).
/// </returns>
public virtual B ReadEnvironment(SystemReader sr)
{
if (GetGitDir() == null)
{
string val = sr.Getenv(Constants.GIT_DIR_KEY);
if (val != null)
{
SetGitDir(new FilePath(val));
}
}
if (GetObjectDirectory() == null)
{
string val = sr.Getenv(Constants.GIT_OBJECT_DIRECTORY_KEY);
if (val != null)
{
SetObjectDirectory(new FilePath(val));
}
}
if (GetAlternateObjectDirectories() == null)
{
string val = sr.Getenv(Constants.GIT_ALTERNATE_OBJECT_DIRECTORIES_KEY);
if (val != null)
{
foreach (string path in val.RegexSplit(FilePath.pathSeparator))
{
AddAlternateObjectDirectory(new FilePath(path));
}
}
}
if (GetWorkTree() == null)
{
string val = sr.Getenv(Constants.GIT_WORK_TREE_KEY);
if (val != null)
{
SetWorkTree(new FilePath(val));
}
}
if (GetIndexFile() == null)
{
string val = sr.Getenv(Constants.GIT_INDEX_FILE_KEY);
if (val != null)
{
SetIndexFile(new FilePath(val));
}
}
if (ceilingDirectories == null)
{
string val = sr.Getenv(Constants.GIT_CEILING_DIRECTORIES_KEY);
if (val != null)
{
foreach (string path in val.RegexSplit(FilePath.pathSeparator))
{
AddCeilingDirectory(new FilePath(path));
}
}
}
return(Self());
}