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, 63 insertions, 0 deletions

diff --git a/src/view.c b/src/view.c
index 0fc1986..e44b386 100644
--- a/src/view.c
+++ b/src/view.c
@@ -350,6 +350,44 @@ teco_view_load_from_file(teco_view_t *ctx, const gchar *filename,
 	return TRUE;
 }
 
+/**
+ * Load stdin until EOF into view's document.
+ *
+ * @param ctx The view to load.
+ * @param clear Whether to completely replace document
+ *   (leaving dot at the beginning of the document) or insert at dot
+ *   (leaving dot at the end of the insertion).
+ * @param error A GError.
+ * @return FALSE in case of a GError.
+ *
+ * @memberof teco_view_t
+ */
+gboolean
+teco_view_load_from_stdin(teco_view_t *ctx, gboolean clear, GError **error)
+{
+#ifdef G_OS_WIN32
+	g_autoptr(GIOChannel) channel = g_io_channel_win32_new_fd(0);
+#else
+	g_autoptr(GIOChannel) channel = g_io_channel_unix_new(0);
+#endif
+	g_assert(channel != NULL);
+
+	/*
+	 * The file loading algorithm does not need buffered
+	 * streams, so disabling buffering should increase
+	 * performance (slightly).
+	 */
+	g_io_channel_set_encoding(channel, NULL, NULL);
+	g_io_channel_set_buffered(channel, FALSE);
+
+	if (!teco_view_load_from_channel(ctx, channel, clear, error)) {
+		g_prefix_error_literal(error, "Error reading stdin: ");
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
 #if 0
 
 /*
@@ -554,6 +592,31 @@ teco_view_save_to_file(teco_view_t *ctx, const gchar *filename, GError **error)
 	return TRUE;
 }
 
+/** @memberof teco_view_t */
+gboolean
+teco_view_save_to_stdout(teco_view_t *ctx, GError **error)
+{
+#ifdef G_OS_WIN32
+	g_autoptr(GIOChannel) channel = g_io_channel_win32_new_fd(1);
+#else
+	g_autoptr(GIOChannel) channel = g_io_channel_unix_new(1);
+#endif
+	g_assert(channel != NULL);
+
+	/*
+	 * teco_view_save_to_channel() expects a buffered and blocking channel
+	 */
+	g_io_channel_set_encoding(channel, NULL, NULL);
+	g_io_channel_set_buffered(channel, TRUE);
+
+	if (!teco_view_save_to_channel(ctx, channel, error)) {
+		g_prefix_error_literal(error, "Error writing to stdout: ");
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
 /**
  * Convert a glyph index to a byte offset as used by Scintilla.
  *