Research pulling in more useful patches not included in upstream

[apainintheneck]

The main Linenoise repo is somewhat abandoned. Though it provided a good foundation it has a large number of bug reports and pending fixes/improvements. Some of those pending fixes and improvements might be useful to add to this repo in a pinch. That is especially true for bug fixes.

Potential Fixes

• fix history on Linux
  • Fixed warnings when using -Wall -Wextra -Wpedantic -std=c11 antirez/linenoise#173
  • Add command line history tests #20
• ignore ANSI escape codes when deciding on cursor position
  • Bug fix when the prompt contains ESC chars antirez/linenoise#135
  • Rewrote the calculation of prompt length, ignoring length of ANSI esc… antirez/linenoise#181
  • Fix single line cursor offset bug #22
• remove duplicate include
  • remove duplicate unistd.h inclusion. antirez/linenoise#139
  • Remove extra header include and change name of extension changes file #24
• fix number conversion warnings
  • Fix conversions between char and int antirez/linenoise#211

Potential Improvements

• add support for Ctrl-Left and Ctrl-Right
  • Add Ctrl-Left and Ctrl-Right antirez/linenoise#205
• implement more common navigation codes
  • handle M-f, M-b, and M-d antirez/linenoise#147
• utf8 support
  • Another implementation for utf8 support. antirez/linenoise#187
  • Pull in utf8 support #27
• history search support
  • Search in History with page up and page down. antirez/linenoise#179
• simply handling of escape codes and add left and right ctrl+arrow
  • simplify handling of input escape codes & support ctrl+arrows antirez/linenoise#216

It might also be interesting to look at some forks to see if they have any changes we can pull in that would be useful.

Linenoise Forks

• https://github.com/rain-1/linenoise-mob

[apainintheneck]

I ran into the ANSI escape sequence prompt bug recently while working on apainintheneck/gitsh#1.

[apainintheneck]

Note: The cursor position bug was only fixed for single line mode by #22. It would be nice to add a fix for multiline mode as well though that would be a bit more complex.

Edit: The cursor position bug has been fixed for single and multiline mode by #27.