Remove readline/linenoise dependency and implement custom multi-line
editor with:
- Terminal raw mode handling (POSIX termios)
- Multi-line buffer with cursor navigation
- Auto-indentation for Ruby blocks
- Auto-dedentation when typing 'end' or '}'
- Natural terminal scrolling behavior
- Emacs-style keybindings (Ctrl+A/E/K/U/W/Y, Alt+B/F/D)
This eliminates GPL licensing concerns from readline while providing
better multi-line editing than the previous single-line implementation.
The MRUBY_MIRB_READLINE environment variable is no longer supported
as readline integration has been completely removed; ref #6626
Co-authored-by: Claude <noreply@anthropic.com>
addresses #6626 where users building portable binaries need explicit control
over readline detection instead of auto-detection.
MRUBY_MIRB_READLINE values:
auto (default) - auto-detect: try readline, then edit, then linenoise
readline, gnu - force GNU readline only
edit, libedit - force libedit only
linenoise - force linenoise only
none, off, false, disabled - use plain input mode (no readline)
close#6626
Co-authored-by: Claude <noreply@anthropic.com>
The build configuration for `mruby` assumes only the `ncurses` library
needs to be linked because `tinfo` is implicitly pulled in.
In environments where ncurses is available only as a static library,
`tinfo` needs to be linked explicitly (needed for functions like
`tputs`.
This patch fixes that by linking `tinfo` if available.
It also fixes the build for environments where only the `ncursesw`
version of the library (including wide character support) is present,
while still giving preference to the `ncurses` version (without wide
character support).
The detection code is unused even on OpenBSD 5.7,
because of the standard installation is libtermcap be installed, not libterminfo.
This fixes#2829
Tested on Arch Linux (x86_64) & OpenBSD 5.7 (amd64).
Signed-off-by: Huei-Horng Yo <hiroshi@ghostsinthelab.org>
Yukihiro "Matz" Matsumoto