forked from lix-project/lix
repl: give user the choice between libeditline and libreadline
The goal is to support libeditline AND libreadline and let the user decide at compile time which one to use. Add a compile time option to use libreadline instead of libeditline. If compiled against libreadline completion functionality is lost because of a incompatibility between libeditlines and libreadlines completion function. Completion with libreadline is possible and can be added later. To use libreadline instead of libeditline the environment variables 'EDITLINE_LIBS' and 'EDITLINE_CFLAGS' have to been set during the ./configure step. Example: EDITLINE_LIBS="/usr/lib/x86_64-linux-gnu/libhistory.so /usr/lib/x86_64-linux-gnu/libreadline.so" EDITLINE_CFLAGS="-DREADLINE" The reason for this change is that for example on Debian already three different editline libraries exist but none of those is compatible the flavor used by nix. My hope is that with this change it would be easier to port nix to systems that have already libreadline available.
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@ -5,7 +5,12 @@
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#include <setjmp.h>
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#ifdef READLINE
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#include <readline/history.h>
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#include <readline/readline.h>
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#else
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#include <editline.h>
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#endif
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#include "shared.hh"
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#include "eval.hh"
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@ -202,11 +207,15 @@ void NixRepl::mainLoop(const std::vector<std::string> & files)
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// Allow nix-repl specific settings in .inputrc
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rl_readline_name = "nix-repl";
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createDirs(dirOf(historyFile));
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#ifndef READLINE
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el_hist_size = 1000;
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#endif
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read_history(historyFile.c_str());
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curRepl = this;
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#ifndef READLINE
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rl_set_complete_func(completionCallback);
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rl_set_list_possib_func(listPossibleCallback);
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#endif
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std::string input;
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