revert last changes, but disable all the same features that

--enable-tiny does when --with-slang is used


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4204 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

 2007-12-17  David Lawrence Ramsey  <pooka109@gmail.com>
 
-	* configure.ac, doc/texinfo/nano.texi, nano.c (version,
-	handle_sigwinch, terminal_init), winio.c (total_redraw): Remove
-	slang curses emulation support, as it's hopelessly broken, and
-	it doesn't make the binary very much smaller, especially when
-	--enable-tiny is used.
+	* configure.ac, doc/texinfo/nano.texi, nano.c (terminal_init):
+	Change slang curses emulation support to turn off the same
+	options as --enable-tiny, as it's hopelessly broken otherwise.
 	* nano.c (disable_signals, main): Simplify terminal handling by
-	using raw mode instead of cbreak mode.  This eliminates the need
-	for disable_signals().
+	using raw mode instead of cbreak mode.
 	* text.c (execute_command): Call terminal_init() instead of just
 	disable_signals() after executing the command, as the command
 	may have changed the terminal settings.

configure.ac

@@ -185,6 +185,205 @@ fi],
 [enable_utf8=auto])
 AC_MSG_RESULT($enable_utf8)
 
+AC_MSG_CHECKING([whether to use slang])
+CURSES_LIB_NAME=""
+AC_ARG_WITH(slang,
+[  --with-slang[=DIR]      Use the slang library instead of curses],
+[    case "$with_slang" in
+    no)
+	AC_MSG_RESULT(no)
+	;;
+    *)
+	AC_MSG_RESULT(yes)
+
+	if test x$with_slang != xyes; then
+	    # Add additional search path
+	    LDFLAGS="-L$with_slang/lib $LDFLAGS"
+	    CPPFLAGS="-I$with_slang/include $CPPFLAGS"
+	fi
+
+	if test x$enable_utf8 != xno; then
+	    AC_CHECK_HEADER(slcurses.h,
+		AC_MSG_CHECKING([for SLutf8_enable in -lslang])
+		_libs=$LIBS
+		LIBS="$LIBS -lslang"
+		AC_TRY_RUN([
+#include <slcurses.h>
+int main(void)
+{
+    SLutf8_enable(1);
+    return 0;
+}],
+		    [AC_MSG_RESULT(yes)
+		    AC_DEFINE(USE_SLANG, 1, [Define to use the slang wrappers for curses instead of native curses.]) slang_support=yes
+		    CURSES_LIB_WIDE=yes
+		    if test x$with_slang != xyes; then
+			CURSES_LIB="-L${with_slang}/lib -lslang"
+		    else
+			CURSES_LIB="-lslang"
+		    fi
+		    CURSES_LIB_NAME=slang],
+		    [AC_MSG_RESULT(no)
+
+		    # We might need the term library
+		    for termlib in ncurses curses termcap terminfo termlib; do
+			AC_CHECK_LIB([${termlib}], tputs, [tcap="-l$termlib"])
+			test -n "$tcap" && break
+		    done
+
+		    AC_MSG_CHECKING([for SLutf8_enable in -lslang $tcap])
+		    LIBS="$LIBS $tcap"
+		    AC_TRY_RUN([
+#include <slcurses.h>
+int main(void)
+{
+    SLutf8_enable(1);
+    return 0;
+}],
+			[AC_MSG_RESULT(yes)
+			AC_DEFINE(USE_SLANG, 1, [Define to use the slang wrappers for curses instead of native curses.]) slang_support=yes
+			CURSES_LIB_WIDE=yes
+			if test x$with_slang != xyes; then
+			    CURSES_LIB="-L${with_slang}/lib -lslang $tcap"
+			else
+			    CURSES_LIB="-lslang $tcap"
+			fi
+			CURSES_LIB_NAME=slang],
+			[AC_MSG_RESULT(no)
+
+			# We might need the math library
+			AC_MSG_CHECKING([for SLutf8_enable in -lslang $tcap -lm])
+			LIBS="$LIBS -lm"
+			AC_TRY_RUN([
+#include <slcurses.h>
+int main(void)
+{
+    SLutf8_enable(1);
+    return 0;
+}],
+			    [AC_MSG_RESULT(yes)
+			    AC_DEFINE(USE_SLANG, 1, [Define to use the slang wrappers for curses instead of native curses.]) slang_support=yes
+			    CURSES_LIB_WIDE=yes
+			    if test x$with_slang != xyes; then
+				CURSES_LIB="-L${with_slang}/lib -lslang $tcap -lm"
+			    else
+				CURSES_LIB="-lslang $tcap -lm"
+			    fi
+			    CURSES_LIB_NAME=slang],
+			    [AC_MSG_RESULT(no)],
+    AC_MSG_WARN([*** Can not use slang when cross-compiling]))],
+    AC_MSG_WARN([*** Can not use slang when cross-compiling]))],
+    AC_MSG_WARN([*** Can not use slang when cross-compiling])),
+	    AC_MSG_ERROR([
+*** The header file slcurses.h was not found.  If you wish to use
+*** slang support this header file is required.  Please either
+*** install a version of slang that includes the slcurses.h file or
+*** do not call the configure script with --with-slang.]))
+	fi
+
+	if eval "test x$CURSES_LIB_NAME = x"; then
+	    # Reset libs if the above slang tests failed
+	    if test x$enable_utf8 != xno; then
+		LIBS=$_libs
+	    fi
+
+	    AC_CHECK_HEADER(slcurses.h,
+		AC_MSG_CHECKING([for SLtt_initialize in -lslang])
+		_libs=$LIBS
+		LIBS="$LIBS -lslang"
+		AC_TRY_RUN([
+#include <slcurses.h>
+int main(void)
+{
+    SLtt_initialize(NULL);
+    return 0;
+}],
+		    [AC_MSG_RESULT(yes)
+		    AC_DEFINE(USE_SLANG, 1, [Define to use the slang wrappers for curses instead of native curses.]) slang_support=yes
+		    if test x$with_slang != xyes; then
+			CURSES_LIB="-L${with_slang}/lib -lslang"
+		    else
+			CURSES_LIB="-lslang"
+		    fi
+		    CURSES_LIB_NAME=slang],
+		    [AC_MSG_RESULT(no)
+
+		    # We might need the term library
+		    for termlib in ncurses curses termcap terminfo termlib; do
+			AC_CHECK_LIB([${termlib}], tputs, [tcap="-l$termlib"])
+			test -n "$tcap" && break
+		    done
+
+		    AC_MSG_CHECKING([for SLtt_initialize in -lslang $tcap])
+		    LIBS="$LIBS $tcap"
+		    AC_TRY_RUN([
+#include <slcurses.h>
+int main(void)
+{
+    SLtt_initialize(NULL);
+    return 0;
+}],
+			[AC_MSG_RESULT(yes)
+			AC_DEFINE(USE_SLANG, 1, [Define to use the slang wrappers for curses instead of native curses.]) slang_support=yes
+			if test x$with_slang != xyes; then
+			    CURSES_LIB="-L${with_slang}/lib -lslang $tcap"
+			else
+			    CURSES_LIB="-lslang $tcap"
+			fi
+			CURSES_LIB_NAME=slang],
+			[AC_MSG_RESULT(no)
+
+			# We might need the math library
+			AC_MSG_CHECKING([for SLtt_initialize in -lslang $tcap -lm])
+			LIBS="$LIBS -lm"
+			AC_TRY_RUN([
+#include <slcurses.h>
+int main(void)
+{
+    SLtt_initialize(NULL);
+    return 0;
+}],
+			    [AC_MSG_RESULT(yes)
+			    AC_DEFINE(USE_SLANG, 1, [Define to use the slang wrappers for curses instead of native curses.]) slang_support=yes
+			    if test x$with_slang != xyes; then
+				CURSES_LIB="-L${with_slang}/lib -lslang $tcap -lm"
+			    else
+				CURSES_LIB="-lslang $tcap -lm"
+			    fi
+			    CURSES_LIB_NAME=slang],
+			    [AC_MSG_RESULT(no)],
+    AC_MSG_WARN([*** Can not use slang when cross-compiling]))],
+    AC_MSG_WARN([*** Can not use slang when cross-compiling]))],
+    AC_MSG_WARN([*** Can not use slang when cross-compiling])),
+	    AC_MSG_ERROR([
+*** The header file slcurses.h was not found.  If you wish to use
+*** slang support this header file is required.  Please either
+*** install a version of slang that includes the slcurses.h file or
+*** do not call the configure script with --with-slang.]))
+	fi
+
+	if test "${_libs+set}" = "set"; then
+	    LIBS=$_libs
+	fi
+
+	if test x$with_slang != xyes; then
+	    LDFLAGS=${_ldflags}
+	fi
+	;;
+    esac], [AC_MSG_RESULT(no)])
+
+    if test x$with_slang != xno; then
+	AC_DEFINE(NANO_TINY, 1, [Define this to make the nano executable as small as possible.]) tiny_support=yes
+	AC_DEFINE(DISABLE_BROWSER, 1, [Define this to disable the built-in file browser.])
+	AC_DEFINE(DISABLE_HELP, 1, [Define this to disable the help text display.])
+	AC_DEFINE(DISABLE_JUSTIFY, 1, [Define this to disable the justify routines.])
+	AC_DEFINE(DISABLE_MOUSE, 1, [Define this to disable the mouse functions.])
+	AC_DEFINE(DISABLE_OPERATINGDIR, 1, [Define this to disable the setting of the operating directory (chroot of sorts).])
+	AC_DEFINE(DISABLE_SPELLER, 1, [Define this to disable the spell checker functions.])
+	AC_DEFINE(DISABLE_TABCOMP, 1, [Define to disable the tab completion functions for files and search strings.])
+	AC_DEFINE(DISABLE_WRAPPING, 1, [Define this to disable all text wrapping.])
+    fi
+
 AM_CONDITIONAL(USE_COLOR, test x$color_support = xyes)
 AM_CONDITIONAL(USE_NANORC, test x$nanorc_support = xyes)
 
@@ -279,14 +478,16 @@ else
 	AC_MSG_ERROR([
 *** UTF-8 support was requested, but insufficient UTF-8 support was
 *** detected in your curses and/or C libraries.  Please verify that your
-*** curses was built with wide character support, and that your C
-*** library was built with wide character support.])
+*** slang was built with UTF-8 support or your curses was built with
+*** wide character support, and that your C library was built with wide
+*** character support.])
     elif test x$enable_utf8 != xno; then
 	AC_MSG_WARN([
 *** Insufficient UTF-8 support was detected in your curses and/or C
-*** libraries.  If you want UTF-8 support, please verify that your
-*** curses was built with wide character support, and that your C
-*** library was built with wide character support.])
+*** libraries.  If you want UTF-8 support, please verify that your slang
+*** was built with UTF-8 support or your curses was built with wide
+*** character support, and that your C library was built with wide
+*** character support.])
     fi
 fi
 

doc/texinfo/nano.texi

@@ -842,11 +842,15 @@ Disable long line wrapping by default when nano is run as root.
 
 @item --enable-utf8
 Enable support for reading and writing Unicode files.  This will require
-a wide version of curses.
+either a wide version of curses, or a UTF-8-enabled version of Slang.
 
 @item --disable-utf8
 Disable support for reading and writing Unicode files.
 
+@item --with-slang
+Compiling @code{nano} with Slang is supported, and will make the binary
+notably smaller than if compiled with ncurses or other curses libraries.
+
 @end table
 
 @contents

src/nano.c

@@ -944,6 +944,9 @@ void version(void)
 #endif
 #ifdef ENABLE_UTF8
     printf(" --enable-utf8");
+#endif
+#ifdef USE_SLANG
+    printf(" --with-slang");
 #endif
     printf("\n");
 }
@@ -1143,10 +1146,19 @@ RETSIGTYPE handle_sigwinch(int signal)
     if (filepart != NULL)
 	unpartition_filestruct(&filepart);
 
+#ifdef USE_SLANG
+    /* Slang curses emulation brain damage, part 1: If we just do what
+     * curses does here, it'll only work properly if the resize made the
+     * window smaller.  Do what mutt does: Leave and immediately reenter
+     * Slang screen management mode. */
+    SLsmg_reset_smg();
+    SLsmg_init_smg();
+#else
     /* Do the equivalent of what Minimum Profit does: Leave and
      * immediately reenter curses mode. */
     endwin();
     doupdate();
+#endif
 
     /* Restore the terminal to its previous state. */
     terminal_init();
@@ -1246,6 +1258,19 @@ void disable_extended_io(void)
     tcsetattr(0, TCSANOW, &term);
 }
 
+#ifdef USE_SLANG
+/* Disable interpretation of the special control keys in our terminal
+ * settings. */
+void disable_signals(void)
+{
+    struct termios term;
+
+    tcgetattr(0, &term);
+    term.c_lflag &= ~ISIG;
+    tcsetattr(0, TCSANOW, &term);
+}
+#endif
+
 #ifndef NANO_TINY
 /* Enable interpretation of the special control keys in our terminal
  * settings. */
@@ -1291,12 +1316,34 @@ void enable_flow_control(void)
  * control characters. */
 void terminal_init(void)
 {
-    raw();
-    nonl();
-    noecho();
-    disable_extended_io();
-    if (ISSET(PRESERVE))
-	enable_flow_control();
+#ifdef USE_SLANG
+    /* Slang curses emulation brain damage, part 2: Slang doesn't
+     * implement raw(), nonl(), or noecho() properly, so there's no way
+     * to properly reinitialize the terminal using them.  We have to
+     * disable the special control keys using termios, save the terminal
+     * state after the first call, and restore it on subsequent
+     * calls. */
+    static struct termios newterm;
+    static bool newterm_set = FALSE;
+
+    if (!newterm_set) {
+#endif
+
+	raw();
+	nonl();
+	noecho();
+	disable_extended_io();
+	if (ISSET(PRESERVE))
+	    enable_flow_control();
+
+#ifdef USE_SLANG
+	disable_signals();
+
+	tcgetattr(0, &newterm);
+	newterm_set = TRUE;
+    } else
+	tcsetattr(0, TCSANOW, &newterm);
+#endif
 }
 
 /* Read in a character, interpret it as a shortcut or toggle if

src/nano.h

@@ -61,8 +61,15 @@
 #define PATH_MAX 4096
 #endif
 
+#ifdef USE_SLANG
+/* Slang support. */
+#include <slcurses.h>
+/* Slang curses emulation brain damage, part 3: Slang doesn't define the
+ * curses equivalents of the Insert or Delete keys. */
+#define KEY_DC SL_KEY_DELETE
+#define KEY_IC SL_KEY_IC
 /* Ncurses support. */
-#ifdef HAVE_NCURSES_H
+#elif defined(HAVE_NCURSES_H)
 #include <ncurses.h>
 #else
 /* Curses support. */

src/proto.h

@@ -475,6 +475,9 @@ void allow_pending_sigwinch(bool allow);
 void do_toggle(const toggle *which);
 #endif
 void disable_extended_io(void);
+#ifdef USE_SLANG
+void disable_signals(void);
+#endif
 #ifndef NANO_TINY
 void enable_signals(void);
 #endif

src/winio.c

@@ -3167,7 +3167,14 @@ void edit_update(update_type location)
 /* Unconditionally redraw the entire screen. */
 void total_redraw(void)
 {
+#ifdef USE_SLANG
+    /* Slang curses emulation brain damage, part 4: Slang doesn't define
+     * curscr. */
+    SLsmg_touch_screen();
+    SLsmg_refresh();
+#else
     wrefresh(curscr);
+#endif
 }
 
 /* Unconditionally redraw the entire screen, and then refresh it using