fixes #373 Check for and use RGB property in terminfo

This also regenerated some definitions, which should lead to
more accurate mouse mode for a few of the terminals.

terminfo/a/alacritty/term.go

@@ -34,7 +34,7 @@ func init() {
 		EnterAcs:     "\x1b(0",
 		ExitAcs:      "\x1b(B",
 		Mouse:        "\x1b[<",
-		MouseMode:    "%?%p1%{1}%=%t%'h'%Pa%e%'l'%Pa%;\x1b[?1000%ga%c\x1b[?1002%ga%c\x1b[?1003%ga%c\x1b[?1006%ga%c",
+		MouseMode:    "\x1b[?1006;1000%?%p1%{1}%=%th%el%;",
 		SetCursor:    "\x1b[%i%p1%d;%p2%dH",
 		CursorBack1:  "\b",
 		CursorUp1:    "\x1b[A",

terminfo/k/konsole/term.go

@@ -34,7 +34,7 @@ func init() {
 		ExitAcs:      "\x0f",
 		EnableAcs:    "\x1b)0",
 		Mouse:        "\x1b[<",
-		MouseMode:    "%?%p1%{1}%=%t%'h'%Pa%e%'l'%Pa%;\x1b[?1000%ga%c\x1b[?1002%ga%c\x1b[?1003%ga%c\x1b[?1006%ga%c",
+		MouseMode:    "\x1b[?1006;1000%?%p1%{1}%=%th%el%;",
 		SetCursor:    "\x1b[%i%p1%d;%p2%dH",
 		CursorBack1:  "\b",
 		CursorUp1:    "\x1b[A",
@@ -93,7 +93,7 @@ func init() {
 		ExitAcs:      "\x0f",
 		EnableAcs:    "\x1b)0",
 		Mouse:        "\x1b[<",
-		MouseMode:    "%?%p1%{1}%=%t%'h'%Pa%e%'l'%Pa%;\x1b[?1000%ga%c\x1b[?1002%ga%c\x1b[?1003%ga%c\x1b[?1006%ga%c",
+		MouseMode:    "\x1b[?1006;1000%?%p1%{1}%=%th%el%;",
 		SetCursor:    "\x1b[%i%p1%d;%p2%dH",
 		CursorBack1:  "\b",
 		CursorUp1:    "\x1b[A",

terminfo/mkinfo.go

@@ -132,7 +132,7 @@ func unescape(s string) string {
 }
 
 func (tc *termcap) setupterm(name string) error {
-	cmd := exec.Command("infocmp", "-1", name)
+	cmd := exec.Command("infocmp", "-x", "-1", name)
 	output := &bytes.Buffer{}
 	cmd.Stdout = output
 
@@ -362,6 +362,24 @@ func getinfo(name string) (*terminfo.Terminfo, string, error) {
 		t.KeyCtrlEnd = "\x1b[8^"
 	}
 
+	// Technically the RGB flag that is provided for xterm-direct is not
+	// quite right.  The problem is that the -direct flag that was introduced
+	// with ncurses 6.1 requires a parsing for the parameters that we lack.
+	// For this case we'll just assume it's XTerm compatible.  Someday this
+	// may be incorrect, but right now it is correct, and nobody uses it
+	// anyway.
+	if tc.getflag("Tc") {
+		// This presumes XTerm 24-bit true color.
+		t.TrueColor = true
+	} else if tc.getflag("RGB") {
+		// This is for xterm-direct, which uses a different scheme entirely.
+		// (ncurses went a very different direction from everyone else, and
+		// so it's unlikely anything is using this definition.)
+		t.TrueColor = true
+		t.SetBg = "\x1b[%?%p1%{8}%<%t4%p1%d%e%p1%{16}%<%t10%p1%{8}%-%d%e48;5;%p1%d%;m"
+		t.SetFg = "\x1b[%?%p1%{8}%<%t3%p1%d%e%p1%{16}%<%t9%p1%{8}%-%d%e38;5;%p1%d%;m"
+	}
+
 	// If the kmous entry is present, then we need to record the
 	// the codes to enter and exit mouse mode.  Sadly, this is not
 	// part of the terminfo databases anywhere that I've found, but
@@ -427,6 +445,13 @@ func dotGoAddStr(w io.Writer, n string, s string) {
 	}
 	fmt.Fprintf(w, "\t\t%-13s %q,\n", n+":", s)
 }
+func dotGoAddFlag(w io.Writer, n string, b bool) {
+	if !b {
+		// initialized to 0, ignore
+		return
+	}
+	fmt.Fprintf(w, "\t\t%-13s true,\n", n+":")
+}
 
 func dotGoAddArr(w io.Writer, n string, a []string) {
 	if len(a) == 0 {
@@ -596,6 +621,7 @@ func dotGoInfo(w io.Writer, terms []*TData) {
 		dotGoAddStr(w, "KeyCtrlHome", t.KeyCtrlHome)
 		dotGoAddStr(w, "KeyCtrlEnd", t.KeyCtrlEnd)
 		dotGoAddInt(w, "Modifiers", t.Modifiers)
+		dotGoAddFlag(w, "TrueColor", t.TrueColor)
 		fmt.Fprintln(w, "\t})")
 	}
 	fmt.Fprintln(w, "}")

terminfo/s/simpleterm/term.go

@@ -65,6 +65,7 @@ func init() {
 		KeyClear:     "\x1b[3;5~",
 		KeyBacktab:   "\x1b[Z",
 		Modifiers:    1,
+		TrueColor:    true,
 	})
 
 	//  simpleterm with 256 colors
@@ -126,5 +127,6 @@ func init() {
 		KeyClear:     "\x1b[3;5~",
 		KeyBacktab:   "\x1b[Z",
 		Modifiers:    1,
+		TrueColor:    true,
 	})
 }

terminfo/terminfo.go

@@ -212,6 +212,7 @@ type Terminfo struct {
 	KeyMetaShfHome  string
 	KeyMetaShfEnd   string
 	Modifiers       int
+	TrueColor       bool // true if the terminal supports direct color
 }
 
 const (
@@ -737,7 +738,9 @@ func LookupTerminfo(name string) (*Terminfo, error) {
 
 	// If the name ends in -truecolor, then fabricate an entry
 	// from the corresponding -256color, -color, or bare terminal.
-	if t == nil && strings.HasSuffix(name, "-truecolor") {
+	if t.TrueColor {
+		addtruecolor = true
+	} else if t == nil && strings.HasSuffix(name, "-truecolor") {
 
 		suffixes := []string{
 			"-256color",

terminfo/x/xterm_kitty/term.go

@@ -62,5 +62,6 @@ func init() {
 		KeyF12:       "\x1b[24~",
 		KeyBacktab:   "\x1b[Z",
 		Modifiers:    1,
+		TrueColor:    true,
 	})
 }