[m-users.] GNU Readline example

[Sean Charles (emacstheviking)]

I have used this library from C many times but I think it is used by the mercury debugger but try as I might I couldn’t really find any sample code to figure out how to do the FFI wrappers. I have done C FFI in Mercury before so I am sure I could manage to do it, there are only a few calls needed to initialise it and the history feature IIRC.

As a time saver I wondered if anybody had a reference in the code that did this already? I did a search but only found compiler options, noactual stealable code!

Thanks,
Sean.

—
{12:13}~/Documents/code/mercury/mercury-srcdist-20.06.1:master ✗ ➭ find . -name "*.m" -exec grep -iHn readline {} \;
./browser/browser_info.m:280:% done via a call to the readline library (if available), using streams
./compiler/compile_target_code.m:2394:        globals.lookup_bool_option(Globals, use_readline, UseReadline),
./compiler/compile_target_code.m:2396:            UseReadline = yes,
./compiler/compile_target_code.m:2397:            globals.lookup_string_option(Globals, readline_libs, ReadlineLibs),
./compiler/compile_target_code.m:2398:            SystemTraceLibs = SystemTraceLibs0 ++ " " ++ ReadlineLibs
./compiler/compile_target_code.m:2400:            UseReadline = no,
./compiler/options.m:985:    ;       use_readline
./compiler/options.m:1015:    ;       readline_libs
./compiler/options.m:1930:    use_readline                        -   bool(yes),
./compiler/options.m:1962:    readline_libs                       -   string(""),
./compiler/options.m:2968:long_option("use-readline",         use_readline).
./compiler/options.m:3000:long_option("readline-libs",        readline_libs).
./compiler/options.m:6118:        "--no-use-readline",
./compiler/options.m:6119:        "\tDisable use of the readline library in the debugger.",
./compiler/options.m:6176:        % --thread-libs, --shared-libs, --math-lib, --readline-libs,