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a63a8020ef
Support the use of the editline library as an alternative to GNU readline for
the debugger command-line prompt. The former has a more permissive license
than the latter. If licensing is not an issue then GNU readline is the
preferable choice (e.g. feature wise); as such it is the default option.
NOTE: there are (apparently) two editline libraries, one derived from NetBSD
and one from Minix -- this diff adds support for the former. (Using the latter
should just be a matter of using a different header file and supplying a
different library name to link against, but I haven't tried that yet.)
m4/mercury.m4:
Add a configuration check for editline.
configure.ac:
Check the presence of editline.
runtime/mercury_conf.h.in:
Replace the macro MR_NO_USE_READLINE with MR_USE_READLINE which
is defined if GNU readline is available and the user has not
forbidden its use.
Add a new macro MR_USE_EDITLINE which does the same for editline.
Add a new macro that is defined if the header editline/readline.h
is present.
trace/mercury_trace_completion.c:
trace/mercury_trace_readline.c:
Use editline in place of readline if appropriate.