1 files changed, 268 insertions, 0 deletions
diff --git a/tty-features.c b/tty-features.c
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+++ b/tty-features.c
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+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2020 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "tmux.h"
+
+/*
+ * Still hardcoded:
+ * - bracket paste (sent if application asks for it);
+ * - mouse (under kmous capability);
+ * - focus events (under focus-events option);
+ * - default colours (under AX or op capabilities);
+ * - AIX colours (under colors >= 16);
+ * - alternate escape (under XT).
+ *
+ * Also:
+ * - XT is used to decide whether to send DA and DSR;
+ * - DECSLRM and DECFRA use a flag instead of capabilities;
+ * - UTF-8 is a separate flag on the client; needed for unattached clients.
+ */
+
+/* A named terminal feature. */
+struct tty_feature {
+	const char	 *name;
+	const char	**capabilities;
+	int		  flags;
+};
+
+/* Terminal has xterm(1) title setting. */
+static const char *tty_feature_title_capabilities[] = {
+	"tsl=\\E]0;", /* should be using TS really */
+	"fsl=\\a",
+	NULL
+};
+static struct tty_feature tty_feature_title = {
+	"title",
+	tty_feature_title_capabilities,
+	0
+};
+
+/* Terminal can set the clipboard with OSC 52. */
+static const char *tty_feature_clipboard_capabilities[] = {
+	"Ms=\\E]52;%p1%s;%p2%s\\a",
+	NULL
+};
+static struct tty_feature tty_feature_clipboard = {
+	"clipboard",
+	tty_feature_clipboard_capabilities,
+	0
+};
+
+/*
+ * Terminal supports RGB colour. This replaces setab and setaf also since
+ * terminals with RGB have versions that do not allow setting colours from the
+ * 256 palette.
+ */
+static const char *tty_feature_rgb_capabilities[] = {
+	"AX",
+	"setrgbf=\\E[38;2;%p1%d;%p2%d;%p3%dm",
+	"setrgbb=\\E[48;2;%p1%d;%p2%d;%p3%dm",
+	"setab=\\E[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48;5;%p1%d%;m",
+	"setaf=\\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m",
+	NULL
+};
+static struct tty_feature tty_feature_rgb = {
+	"RGB",
+	tty_feature_rgb_capabilities,
+	(TERM_256COLOURS|TERM_RGBCOLOURS)
+};
+
+/* Terminal supports 256 colours. */
+static const char *tty_feature_256_capabilities[] = {
+	"AX",
+	"setab=\\E[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48;5;%p1%d%;m",
+	"setaf=\\E[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m",
+	NULL
+};
+static struct tty_feature tty_feature_256 = {
+	"256",
+	tty_feature_256_capabilities,
+	TERM_256COLOURS
+};
+
+/* Terminal supports overline. */
+static const char *tty_feature_overline_capabilities[] = {
+	"Smol=\\E[53m",
+	NULL
+};
+static struct tty_feature tty_feature_overline = {
+	"overline",
+	tty_feature_overline_capabilities,
+	0
+};
+
+/* Terminal supports underscore styles. */
+static const char *tty_feature_usstyle_capabilities[] = {
+	"Smulx=\E[4::%p1%dm",
+	"Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m",
+	NULL
+};
+static struct tty_feature tty_feature_usstyle = {
+	"usstyle",
+	tty_feature_usstyle_capabilities,
+	0
+};
+
+/* Terminal supports cursor styles. */
+static const char *tty_feature_cstyle_capabilities[] = {
+	"Ss=\\E[%p1%d q",
+	"Se=\\E[2 q",
+	NULL
+};
+static struct tty_feature tty_feature_cstyle = {
+	"cstyle",
+	tty_feature_cstyle_capabilities,
+	0
+};
+
+/* Terminal supports cursor colours. */
+static const char *tty_feature_ccolour_capabilities[] = {
+	"Cs=\\E]12;%p1%s\\a",
+	"Cr=\\E]112\\a",
+	NULL
+};
+static struct tty_feature tty_feature_ccolour = {
+	"ccolour",
+	tty_feature_ccolour_capabilities,
+	0
+};
+
+/* Terminal supports synchronized updates. */
+static const char *tty_feature_sync_capabilities[] = {
+	"Sync=\\EP=%p1%ds\\E\\\\",
+	NULL
+};
+static struct tty_feature tty_feature_sync = {
+	"sync",
+	tty_feature_sync_capabilities,
+	0
+};
+
+/* Terminal supports DECSLRM margins. */
+static struct tty_feature tty_feature_margins = {
+	"margins",
+	NULL,
+	TERM_DECSLRM
+};
+
+/* Terminal supports DECFRA rectangle fill. */
+static struct tty_feature tty_feature_rectfill = {
+	"rectfill",
+	NULL,
+	TERM_DECFRA
+};
+
+/* Available terminal features. */
+static const struct tty_feature *tty_features[] = {
+	&tty_feature_256,
+	&tty_feature_clipboard,
+	&tty_feature_ccolour,
+	&tty_feature_cstyle,
+	&tty_feature_margins,
+	&tty_feature_overline,
+	&tty_feature_rectfill,
+	&tty_feature_rgb,
+	&tty_feature_sync,
+	&tty_feature_title,
+	&tty_feature_usstyle
+};
+
+void
+tty_add_features(int *feat, const char *s, const char *separators)
+{
+	const struct tty_feature	 *tf;
+	char				 *next, *loop, *copy;
+	u_int				  i;
+
+	loop = copy = xstrdup(s);
+	while ((next = strsep(&loop, separators)) != NULL) {
+		for (i = 0; i < nitems(tty_features); i++) {
+			tf = tty_features[i];
+			if (strcasecmp(tf->name, next) == 0)
+				break;
+		}
+		if (i == nitems(tty_features)) {
+			log_debug("unknown terminal feature: %s", next);
+			break;
+		}
+		if (~(*feat) & (1 << i)) {
+			log_debug("adding terminal feature: %s", tf->name);
+			(*feat) |= (1 << i);
+		}
+	}
+	free(copy);
+}
+
+const char *
+tty_get_features(int feat)
+{
+	const struct tty_feature	*tf;
+	static char			 s[512];
+	u_int				 i;
+
+	*s = '\0';
+	for (i = 0; i < nitems(tty_features); i++) {
+		if (~feat & (1 << i))
+			continue;
+		tf = tty_features[i];
+
+		strlcat(s, tf->name, sizeof s);
+		strlcat(s, ",", sizeof s);
+	}
+	if (*s != '\0')
+		s[strlen(s) - 1] = '\0';
+	return (s);
+}
+
+int
+tty_apply_features(struct tty_term *term, int feat)
+{
+	const struct tty_feature	 *tf;
+	const char			**capability;
+	u_int				  i;
+
+	if (feat == 0)
+		return (0);
+	log_debug("applying terminal features: %s", tty_get_features(feat));
+
+	for (i = 0; i < nitems(tty_features); i++) {
+		if ((term->features & (1 << i)) || (~feat & (1 << i)))
+			continue;
+		tf = tty_features[i];
+
+		log_debug("applying terminal feature: %s", tf->name);
+		if (tf->capabilities != NULL) {
+			capability = tf->capabilities;
+			while (*capability != NULL) {
+				log_debug("adding capability: %s", *capability);
+				tty_term_apply(term, *capability, 1);
+				capability++;
+			}
+		}
+		term->flags |= tf->flags;
+	}
+	if ((term->features | feat) == term->features)
+		return (0);
+	term->features |= feat;
+	return (1);
+}