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0329a37271
Before this patch less would query the terminal geometry only at startup and use this information to render the file when appropriate. If the terminal is resized then the output is broken in several different ways because of this. This patch adds a SIGWINCH signal handler receive notification any time the terminal is resized. This signal handler just sets a flag to notify the main loop that a resize has occurred. The main loop of the program just calls get_key_sequence() to get input from the user, interpreting keystrokes as commands like scroll up or down. The get_key_sequence() function has been changed to return Optional<String>, so it either returns a keystroke from the user or it returns nothing as an empty Optional. While the user is not pressing any keys on the keyboard, the program is blocking on a read() system call in get_key_sequence(). When SIGWINCH is received, this read() will return with -1 and errno is set to EINTR since the system call was interrupted by the signal. When this happens we just return an empty Optional. The mainloop now checks to see if a resize has been requested by checking the flag, and if it has it performs a resize. init() now just calls resize() since the required logic is the same. Setters for m_filename and m_prompt are removed because these are now just initialized by the constructor, as they never change for the life of the program.