getLine package:base

Read a line from the standard input device. getLine is implemented as hGetLine stdin. This operation may fail with the same errors as hGetLine.

Examples

>>> getLine
> Hello World!
"Hello World!"

>>> getLine
>
""

Computation hGetLine hdl reads a line from the file or channel managed by hdl. hGetLine does not return the newline as part of the result. A line is separated by the newline set with hSetNewlineMode or nativeNewline by default. The read newline character(s) are not returned as part of the result. If hGetLine encounters end-of-file at any point while reading in the middle of a line, it is treated as a line terminator and the (partial) line is returned. This operation may fail with:

• isEOFError if the end of file is encountered when reading the first character of the line.

Examples

>>> withFile "/home/user/foo" ReadMode hGetLine >>= putStrLn
this is the first line of the file :O

>>> withFile "/home/user/bar" ReadMode (replicateM 3 . hGetLine)
["this is the first line","this is the second line","this is the third line"]