Doc returns un-indented string as here-document.

Docf returns unindented and formatted string as here-document. Formatting is done as for fmt.Printf().

getMinIndent calculates the minimum indentation in lines, excluding empty lines.

isSpace checks whether the rune represents space or not. Only white spcaes (U+0020) and horizontal tabs are treated as space character. It is the same

removeIndentation removes n characters from the front of each line in lines. Skips first line if skipFirstLine is true, skips empty lines.

Shortcut heredoc.Doc.

Shortcut heredoc.Docf.