repl: history search by a command prefix

readline has very useful feature to search by the commands history backward and forward based on a currently written command prefix.

$ cmake<PgUp>
$ cmake . -DCMAKE_BUILD_TYPE=Debug -DENABLE_BACKTRACE=ON -DENABLE_DIST=ON -DENABLE_FEEDBACK_DAEMON=ON -DENABLE_BUNDLED_LIBCURL=OFF -DENABLE_BUNDLED_LIBUNWIND=ON && make -j8

AFAIU, once enabled in /etc/inputrc (or ~/.inputrc), it works with all readline based tools. At least, it works for me for bash, tarantool, python (since Python 3).

AFAIU, it is not enabled by default in readline, but it is in the default /etc/inputrc on Gentoo. Maybe in some other distros.

https://github.com/gentoo/baselayout/blob/3bfcd8238abf92146a7e17b44625ea1e5325230c/etc/inputrc#L39-L41

I move this part of the inputrc config to everywhere I'm working if it is not present by default.

# map "page up" and "page down" to search history based on current cmdline
"\e[5~": history-search-backward
"\e[6~": history-search-forward

My primary use case with tarantool is the following.

tarantool> fib<PgUp><PgUp>
tarantool> fiber = require('fiber')

I want this behavior in tt as well.

I see the following solution variants:

• Enable this behaviour by default (Gentoo does, so why not?).
• Support given inputrc directives.
• Provide another mechanism/config to enable it system-wide and bind on PgUp/PgDn.

The issue names no implementation files or tests. Start by locating tt's interactive REPL input and history handling, then determine which configuration approach the project should support. Done means PgUp and PgDn search history backward and forward using the currently typed command prefix.