Jonas Hahnfeld via LilyPond user discussion <lilypond-user@gnu.org> writes:
> On Tue, 2022-05-17 at 23:28 +0200, David Kastrup wrote: >> Jonas Hahnfeld via LilyPond user discussion <lilypond-user@gnu.org> >> writes: >> >> > On Tue, 2022-05-17 at 09:57 +0200, Jean Abou Samra wrote: >> > > Le 17/05/2022 à 00:29, Hendursaga a écrit : >> > > > I'm trying to start a REPL server[1] inside LilyPond's Guile >> > > interpreter, but I can't get it to even load readline support. >> > > >> > > Readline support is an optional feature in Guile. It looks like >> > > out new infrastructure for building binaries compiles Guile without >> > > it. We may or may not want to do it (Readline is an extra dependency); >> > > CCing Jonas on this matter. >> > >> > Right, this is intentional. I don't find it convincing that the >> > official binaries should be bigger for everybody to enable an optional >> > feature (readline support) in a dependency (Guile) that only a very >> > tiny fraction might ever try to use... >> >> Personally, I'd rather have it. The tiny fraction that will want >> readline support will want it for running scheme-sandbox or other forms >> of REPL. It greatly increases the friendliness of playing around with >> Scheme stuff in the manner the manual suggests, and the people playing >> around with Scheme stuff are the most likely candidates for becoming >> future contributors. > > As I just replied in my other message, the REPL itself works fine. "[readline] greatly increases the friendliness of playing around with Scheme stuff in the manner the manual suggests, ..." > >> We don't make the "Extending LilyPond" guide optional for a reason, and >> it starts off right away with >> >> 1.1.1 Scheme sandbox >> -------------------- >> >> The LilyPond installation includes the Guile implementation of Scheme. >> On most systems you can experiment in a Scheme sandbox by opening a >> terminal window and typing ‘guile’. On some systems, notably Windows, >> you may need to set the environment variable ‘GUILE_LOAD_PATH’ to the >> directory ‘../usr/share/guile/1.8’ in the LilyPond installation. For >> the full path to this directory see *note (lilypond-learning)Other >> sources of information::. Alternatively, Windows users may simply >> choose ‘Run’ from the Start menu and enter ‘guile’. > > This paragraph is outdated and I'm working towards not shipping the > separate guile executable with the official binaries. Probably by recoding lilypond-invoke-editor in a different language? > I'll update the documentation afterwards to mention that it can be > installed on many Linux systems, but is / will not be included in the > binaries. Does this have to do with byte-compilation? > >> However, a hands-on Scheme sandbox with all of LilyPond loaded is >> available with this command line: >> lilypond scheme-sandbox >> >> Once the sandbox is running, you will receive a guile prompt: >> >> guile> >> >> You can enter Scheme expressions at this prompt to experiment with >> Scheme. > > Up to here, this works fine (even if the prompt looks a bit different > now). > >> If you want to be able to use the GNU readline library for >> nicer editing of the Scheme command line, check the file >> ‘ly/scheme-sandbox.ly’ for more information. If you already have >> enabled the readline library for your interactive Guile sessions outside >> of LilyPond, this should work in the sandbox as well. > > What does "nicer editing" mean here? If that is an optional feature to > an already optional REPL, I'm even more inclined to not include it. More or less "any editing at all" apart from backspacing over text before pressing RET. -- David Kastrup
