[vte] emulation: Support XTVERSION sequence

[Christian Persch <chpe src gnome org>]

commit 0718a9a7f9300b2526eddb0fc74e25eef34795ba
Author: Christian Persch <chpe src gnome org>
Date:   Thu Feb 3 20:58:11 2022 +0100

    emulation: Support XTVERSION sequence

 src/parser-reply.hh |  1 +
 src/parser-seq.py   |  2 ++
 src/vteseq.cc       | 32 ++++++++++++++++++++++++++++++--
 3 files changed, 33 insertions(+), 2 deletions(-)
---
diff --git a/src/parser-reply.hh b/src/parser-reply.hh
index 1ba3022a..c9046b1a 100644
--- a/src/parser-reply.hh
+++ b/src/parser-reply.hh
@@ -57,6 +57,7 @@ _VTE_REPLY(DECCTR,      DCS, 's', NONE, CASH,  _VTE_REPLY_PARAMS({2})) /* color
 _VTE_REPLY(DECAUPSS,    DCS, 'u', NONE, BANG,  ) /* assign user preferred supplemental set */
 _VTE_REPLY(DECCIR,      DCS, 'u', NONE, CASH,  _VTE_REPLY_PARAMS({1})) /* cursor information report */
 _VTE_REPLY(DECRPTUI,    DCS, '|', NONE, BANG,  _VTE_REPLY_STRING("7E565445") /* "~VTE" */) /* report 
terminal unit ID */
+_VTE_REPLY(XTERM_DSR,   DCS, '|', GT,   NONE,  ) /* xterm terminal version report */
 _VTE_REPLY(DECRPFK,     DCS, '}', NONE, DQUOTE,) /* report function key */
 _VTE_REPLY(DECCKSR,     DCS, '~', NONE, BANG,  ) /* memory checksum report */
 _VTE_REPLY(DECRPAK,     DCS, '~', NONE, DQUOTE,) /* report all modifiers/alphanumeric key */
diff --git a/src/parser-seq.py b/src/parser-seq.py
index 2243a203..83b067fd 100755
--- a/src/parser-seq.py
+++ b/src/parser-seq.py
@@ -756,6 +756,8 @@ sequences = [
             comment='select terminal id'),
     seq_CSI('DECCRTST', 'q', intermediates=(Intermediate.MINUS,), flags=Flags.NOP,
             comment='CRT saver time'),
+    seq_CSI('XTERM_VERSION', 'q', pintro=(ParameterIntro.GT,),
+            comment='request xterm version report'),
     seq_CSI('DECSTBM', 'r',
             comment='set top and bottom margins'),
     seq_CSI('DECSKCV', 'r', intermediates=(Intermediate.SPACE,), flags=Flags.NOP,
diff --git a/src/vteseq.cc b/src/vteseq.cc
index 3945fcac..9efde087 100644
--- a/src/vteseq.cc
+++ b/src/vteseq.cc
@@ -69,6 +69,11 @@ enum {
         VTE_SGR_COLOR_SPEC_LEGACY = 5
 };
 
+inline constexpr int firmware_version() noexcept
+{
+        return (VTE_MAJOR_VERSION * 100 + VTE_MINOR_VERSION) * 100 + VTE_MICRO_VERSION;
+}
+
 void
 vte::parser::Sequence::print() const noexcept
 {
@@ -2435,8 +2440,7 @@ Terminal::DA2(vte::parser::Sequence const& seq)
         if (seq.collect1(0, 0) != 0)
                 return;
 
-        int const version = (VTE_MAJOR_VERSION * 100 + VTE_MINOR_VERSION) * 100 + VTE_MICRO_VERSION;
-        reply(seq, VTE_REPLY_DECDA2R, {65, version, 1});
+        reply(seq, VTE_REPLY_DECDA2R, {65, firmware_version(), 1});
 }
 
 void
@@ -9063,6 +9067,30 @@ Terminal::XTERM_STCAP(vte::parser::Sequence const& seq)
          */
 }
 
+void
+Terminal::XTERM_VERSION(vte::parser::Sequence const& seq)
+{
+        /*
+         * XTERM_VERSION - xterm request version report
+         *
+         * Returns the xterm name and version as XTERM_DSR.
+         *
+         * Arguments:
+         *   args[0]: select function
+         *     0: report xterm name and version
+         *
+         * Defaults:
+         *   args[0]: no defaults
+         *
+         * References: XTERM
+         */
+
+        if (seq.collect1(0) != 0)
+                return;
+
+        reply(seq, VTE_REPLY_XTERM_DSR, {}, "VTE(%d)", firmware_version());
+}
+
 void
 Terminal::XTERM_WM(vte::parser::Sequence const& seq)
 {