added --quiet, --stdin and --stdout for easier integration into UNIX pipelines

* In principle --stdin and --stdout could have been done in pure TECO code using the
  <^T> command.
  Having built-in command-line arguments however has several advantages:
  * Significantly faster than reading byte-wise with ^T.
  * Performs EOL normalization unless specifying --8bit of course.
  * Significantly shortens command-lines.
    `sciteco -qio` and `sciteco -qi` can be real replacements for sed and awk.
* You can even place SciTECO into the middle of a pipeline while editing
  interactively:
  foo | sciteco -qio --no-profile | bar
  Unfortunately, this will not currently work when munging the profile
  as command-line parameters are also transmitted via the unnamed buffer.
  This should be changed to use special Q-registers (FIXME).
* --quiet can help to improve the test suite (TODO).
  Should probably be the default in TE_CHECK().
* --stdin and --stdout allow to simplify many SciTECO scripts, avoiding
  temporary files, especially for womenpage generation (TODO).
* For processing potentially infinite streams, you will still have to
  read using ^T.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/interface.c b/src/interface.c
index c3103fd..cfc8279 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -36,6 +36,9 @@
 
 //#define DEBUG
 
+/** minimum level of messages to print to stdout/stderr */
+teco_msg_t teco_interface_msg_level = TECO_MSG_USER;
+
 teco_view_t *teco_interface_current_view = NULL;
 
 TECO_DEFINE_UNDO_CALL(teco_interface_show_view, teco_view_t *);
@@ -114,6 +117,10 @@ teco_interface_msg(teco_msg_t type, const gchar *fmt, ...)
 void
 teco_interface_stdio_msg(teco_msg_t type, const gchar *str, gsize len)
 {
+	/* "user"-level messages are always printed */
+	if (type != TECO_MSG_USER && type < teco_interface_msg_level)
+		return;
+
 	switch (type) {
 	case TECO_MSG_USER:
 		fwrite(str, 1, len, stdout);