Add support for configurable bash completion path

Rewrote the configure script to support the following options:

--with-bash-completion-dir=PATH
--without-bash-completion-dir

configure.ac

@@ -6,9 +6,24 @@ AM_SILENT_RULES([yes])
 AC_PROG_CC
 AC_LANG([C])
 AC_PROG_INSTALL
+
 PKG_PROG_PKG_CONFIG
-PKG_CHECK_VAR(bashcompdir, [bash-completion], [completionsdir], , bashcompdir="${sysconfdir}/bash_completion.d")
-AC_SUBST(bashcompdir)
+AC_ARG_WITH([bash-completion-dir],
+    AS_HELP_STRING([--with-bash-completion-dir[=PATH]],
+                   [Install the bash auto-completion script in this directory. @<:@default=yes@:>@]),
+                   [],
+                   [with_bash_completion_dir=yes])
+
+if test "x$with_bash_completion_dir" = "xyes"; then
+    PKG_CHECK_MODULES([BASH_COMPLETION], [bash-completion >= 2.0],
+        [BASH_COMPLETION_DIR="`pkg-config --variable=completionsdir bash-completion`"],
+        [BASH_COMPLETION_DIR="${sysconfdir}/bash_completion.d"])
+else
+    BASH_COMPLETION_DIR="$with_bash_completion_dir"
+fi
+AC_SUBST([BASH_COMPLETION_DIR])
+AM_CONDITIONAL([ENABLE_BASH_COMPLETION],[test "x$with_bash_completion_dir" != "xno"])
+
 AC_CONFIG_FILES([Makefile])
 AC_CONFIG_FILES([src/Makefile])
 AC_CONFIG_FILES([man/Makefile])

src/Makefile.am

@@ -3,9 +3,14 @@ gotty_SOURCES = tty.c \
                 options.c \
                 time.c \
                 main.c \
+                log.c \
                 include/gotty/tty.h \
                 include/gotty/options.h \
                 include/gotty/time.h \
-                include/gotty/print.h
-bashcompletiondir=@bashcompdir@
+                include/gotty/print.h \
+                include/gotty/log.h
+
+if ENABLE_BASH_COMPLETION
+bashcompletiondir=@BASH_COMPLETION_DIR@
 dist_bashcompletion_DATA=bash-completion/gotty
+endif