Basic support for custom completion handlers with the two "standard"

rl_complete() and rl_list_possib().  Simply leave out complete.o from
the default build and in all programs require these two functions to
be supplied.

A better alternative would be to use function pointers and check those
for NULL in the running code.  With this code, and no completion handler
the editline code will die.

configure

@@ -695,6 +695,8 @@ CPP
 GREP
 EGREP
 LIBOBJS
+COMPLETE_TRUE
+COMPLETE_FALSE
 LTLIBOBJS'
 ac_subst_files=''
       ac_precious_vars='build_alias
@@ -1283,6 +1285,7 @@ Optional Features:
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --disable-dependency-tracking  speeds up one-time build
   --enable-dependency-tracking   do not reject slow dependency extractors
+  --enable-default-complete      Enable default completion handler.
 
 Some influential environment variables:
   CC          C compiler command
@@ -4970,6 +4973,35 @@ fi
 done
 
 
+# Check whether --enable-complete was given.
+if test "${enable_complete+set}" = set; then
+  enableval=$enable_complete;
+   case "${enableval}" in
+       yes)
+        complete=true
+        ;;
+       no)
+        complete=false
+        ;;
+       *)
+        { { echo "$as_me:$LINENO: error: bad value ${enableval} for --enable-default-complete" >&5
+echo "$as_me: error: bad value ${enableval} for --enable-default-complete" >&2;}
+   { (exit 1); exit 1; }; }
+        ;;
+   esac
+else
+  complete=false
+fi
+
+ if test x$complete = xtrue; then
+  COMPLETE_TRUE=
+  COMPLETE_FALSE='#'
+else
+  COMPLETE_TRUE='#'
+  COMPLETE_FALSE=
+fi
+
+
 ac_config_files="$ac_config_files Makefile src/Makefile include/Makefile man/Makefile examples/Makefile"
 
 cat >confcache <<\_ACEOF
@@ -5082,6 +5114,13 @@ echo "$as_me: error: conditional \"am__fastdepCC\" was never defined.
 Usually this means the macro was only invoked conditionally." >&2;}
    { (exit 1); exit 1; }; }
 fi
+if test -z "${COMPLETE_TRUE}" && test -z "${COMPLETE_FALSE}"; then
+  { { echo "$as_me:$LINENO: error: conditional \"COMPLETE\" was never defined.
+Usually this means the macro was only invoked conditionally." >&5
+echo "$as_me: error: conditional \"COMPLETE\" was never defined.
+Usually this means the macro was only invoked conditionally." >&2;}
+   { (exit 1); exit 1; }; }
+fi
 
 : ${CONFIG_STATUS=./config.status}
 ac_clean_files_save=$ac_clean_files
@@ -5698,10 +5737,12 @@ CPP!$CPP$ac_delim
 GREP!$GREP$ac_delim
 EGREP!$EGREP$ac_delim
 LIBOBJS!$LIBOBJS$ac_delim
+COMPLETE_TRUE!$COMPLETE_TRUE$ac_delim
+COMPLETE_FALSE!$COMPLETE_FALSE$ac_delim
 LTLIBOBJS!$LTLIBOBJS$ac_delim
 _ACEOF
 
-  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 81; then
+  if test `sed -n "s/.*$ac_delim\$/X/p" conf$$subs.sed | grep -c X` = 83; then
     break
   elif $ac_last_try; then
     { { echo "$as_me:$LINENO: error: could not make $CONFIG_STATUS" >&5

configure.ac

@@ -40,4 +40,19 @@ AC_PROG_GCC_TRADITIONAL
 AC_FUNC_STAT
 AC_CHECK_FUNCS([strchr strdup strrchr tcgetattr])
 
+AC_ARG_ENABLE([complete],
+   [  --enable-default-complete      Enable default completion handler.],[
+   case "${enableval}" in
+       yes)
+        complete=true
+        ;;
+       no)
+        complete=false
+        ;;
+       *)
+        AC_MSG_ERROR([bad value ${enableval} for --enable-default-complete])
+        ;;
+   esac],[complete=false])
+AM_CONDITIONAL([COMPLETE], [test x$complete = xtrue])
+
 AC_OUTPUT(Makefile src/Makefile include/Makefile man/Makefile examples/Makefile)

examples/Makefile.am

@@ -1,10 +1,10 @@
 AUTOMAKE_OPTIONS = foreign
 
 LDADD = $(top_builddir)/src/libedit.a
-AM_CFLAGS = -I$(top_srcdir)/src
+AM_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/include
 
 # TODO: Port "fileman" example from BSD editline
-noinst_PROGRAMS = testit
+noinst_PROGRAMS = testit cli
 
 testit_SOURCES = testit.c
 #fileman_SOURCES = fileman.c

examples/Makefile.in

@@ -30,7 +30,7 @@ POST_INSTALL = :
 NORMAL_UNINSTALL = :
 PRE_UNINSTALL = :
 POST_UNINSTALL = :
-noinst_PROGRAMS = testit$(EXEEXT)
+noinst_PROGRAMS = testit$(EXEEXT) cli$(EXEEXT)
 subdir = examples
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -41,6 +41,10 @@ mkinstalldirs = $(install_sh) -d
 CONFIG_HEADER = $(top_builddir)/config.h
 CONFIG_CLEAN_FILES =
 PROGRAMS = $(noinst_PROGRAMS)
+cli_SOURCES = cli.c
+cli_OBJECTS = cli.$(OBJEXT)
+cli_LDADD = $(LDADD)
+cli_DEPENDENCIES = $(top_builddir)/src/libedit.a
 am_testit_OBJECTS = testit.$(OBJEXT)
 testit_OBJECTS = $(am_testit_OBJECTS)
 testit_LDADD = $(LDADD)
@@ -52,8 +56,8 @@ COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
 CCLD = $(CC)
 LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
-SOURCES = $(testit_SOURCES)
-DIST_SOURCES = $(testit_SOURCES)
+SOURCES = cli.c $(testit_SOURCES)
+DIST_SOURCES = cli.c $(testit_SOURCES)
 ETAGS = etags
 CTAGS = ctags
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
@@ -144,7 +148,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 AUTOMAKE_OPTIONS = foreign
 LDADD = $(top_builddir)/src/libedit.a
-AM_CFLAGS = -I$(top_srcdir)/src
+AM_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/include
 testit_SOURCES = testit.c
 all: all-am
 
@@ -182,6 +186,9 @@ $(ACLOCAL_M4):  $(am__aclocal_m4_deps)
 
 clean-noinstPROGRAMS:
 	-test -z "$(noinst_PROGRAMS)" || rm -f $(noinst_PROGRAMS)
+cli$(EXEEXT): $(cli_OBJECTS) $(cli_DEPENDENCIES) 
+	@rm -f cli$(EXEEXT)
+	$(LINK) $(cli_OBJECTS) $(cli_LDADD) $(LIBS)
 testit$(EXEEXT): $(testit_OBJECTS) $(testit_DEPENDENCIES) 
 	@rm -f testit$(EXEEXT)
 	$(LINK) $(testit_OBJECTS) $(testit_LDADD) $(LIBS)
@@ -192,6 +199,7 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cli.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/testit.Po@am__quote@
 
 .c.o:

examples/cli.c

@@ -0,0 +1,78 @@
+/* The "testit" micro shell, now with command completion. 
+ * To be able to run, don't "--enable-default-complete".
+ */
+#include "editline.h"
+#include <string.h>
+
+char *list[] = {
+   "foo ", "bar ", "bsd ", "cli ", "ls ", "cd ", "malloc ", "tee ", NULL
+};
+
+/*
+**  Attempt to complete the pathname, returning an allocated copy.
+**  Fill in *unique if we completed it, or set it to 0 if ambiguous.
+*/
+char *rl_complete(char *token, int *match)
+{
+   int i;
+   int index = -1;
+   int matchlen = 0;
+   int count = 0;
+
+   for (i = 0; list[i]; i++)
+   {
+      int partlen = strlen (token); /* Part of token */
+
+      if (!strncmp (list[i], token, partlen))
+      {
+         index = i;
+         matchlen = partlen;
+         count ++;
+      }
+   }
+
+   if (count == 1)
+   {
+      *match = 1;
+      return strdup (list[index] + matchlen);
+   }
+
+   return NULL;
+}
+
+/*
+**  Return all possible completions.
+*/
+int rl_list_possib(char *token, char ***av)
+{
+   int i, num, total = 0;
+   char **copy;
+   
+   for (num = 0; list[num]; num++)
+      ;
+   copy = (char **) malloc (num * sizeof(char *));
+   for (i = 0; i < num; i++)
+   {
+      if (!strncmp (list[i], token, strlen (token)))
+      {
+         copy[total] = strdup (list[i]);
+         total ++;
+      }
+   }
+   *av = copy;
+
+   return total;
+}
+
+int main(int ac, char *av[])
+{
+   char *line;
+   char	*prompt = "cli> ";
+
+   while ((line = readline(prompt)) != NULL) {
+      (void)printf("\t\t\t|%s|\n", line);
+      free(line);
+   }
+
+   return 0;
+}

src/Makefile.am

@@ -2,5 +2,8 @@ AUTOMAKE_OPTIONS = foreign
 
 lib_LIBRARIES = libedit.a
 
-libedit_a_SOURCES = editline.c editline.h complete.c sysunix.c unix.h
-
+libedit_a_SOURCES  = editline.c editline.h sysunix.c unix.h
+if COMPLETE
+# Built-in completion handler.
+libedit_a_SOURCES += complete.c
+endif

src/Makefile.in

@@ -30,6 +30,8 @@ POST_INSTALL = :
 NORMAL_UNINSTALL = :
 PRE_UNINSTALL = :
 POST_UNINSTALL = :
+# Built-in completion handler.
+@COMPLETE_TRUE@am__append_1 = complete.c
 subdir = src
 DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
@@ -52,8 +54,11 @@ AR = ar
 ARFLAGS = cru
 libedit_a_AR = $(AR) $(ARFLAGS)
 libedit_a_LIBADD =
-am_libedit_a_OBJECTS = editline.$(OBJEXT) complete.$(OBJEXT) \
-	sysunix.$(OBJEXT)
+am__libedit_a_SOURCES_DIST = editline.c editline.h sysunix.c unix.h \
+	complete.c
+@COMPLETE_TRUE@am__objects_1 = complete.$(OBJEXT)
+am_libedit_a_OBJECTS = editline.$(OBJEXT) sysunix.$(OBJEXT) \
+	$(am__objects_1)
 libedit_a_OBJECTS = $(am_libedit_a_OBJECTS)
 DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
 depcomp = $(SHELL) $(top_srcdir)/depcomp
@@ -63,7 +68,7 @@ COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 CCLD = $(CC)
 LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
 SOURCES = $(libedit_a_SOURCES)
-DIST_SOURCES = $(libedit_a_SOURCES)
+DIST_SOURCES = $(am__libedit_a_SOURCES_DIST)
 ETAGS = etags
 CTAGS = ctags
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
@@ -154,7 +159,8 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 AUTOMAKE_OPTIONS = foreign
 lib_LIBRARIES = libedit.a
-libedit_a_SOURCES = editline.c editline.h complete.c sysunix.c unix.h
+libedit_a_SOURCES = editline.c editline.h sysunix.c unix.h \
+	$(am__append_1)
 all: all-am
 
 .SUFFIXES: