[vte/vte-0-48] emulation: Add support for REP (repeat preceding graphic character)

[Egmont Koblinger <egmontkob src gnome org>]

commit d854bc3b98018854dfdfbf54532e2deb5b662689
Author: Egmont Koblinger <egmont gmail com>
Date:   Thu Sep 28 16:03:04 2017 +0200

    emulation: Add support for REP (repeat preceding graphic character)
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787701
    (cherry picked from commit 0656a5794c8d075c8e7c4b56b3b6142068433981)

 src/vte.cc         |    6 ++++++
 src/vteinternal.hh |    1 +
 src/vteseq-n.gperf |    2 +-
 src/vteseq.cc      |   18 ++++++++++++++++++
 4 files changed, 26 insertions(+), 1 deletions(-)
---
diff --git a/src/vte.cc b/src/vte.cc
index c56c7da..e154d72 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -2899,6 +2899,7 @@ VteTerminalPrivate::insert_char(gunichar c,
        long col;
        int columns, i;
        bool line_wrapped = false; /* cursor moved before char inserted */
+        gunichar c_unmapped = c;
 
         /* DEC Special Character and Line Drawing Set.  VT100 and higher (per XTerm docs). */
         static gunichar line_drawing_map[31] = {
@@ -3045,6 +3046,8 @@ VteTerminalPrivate::insert_char(gunichar c,
                                      row_num, 1);
 
                goto done;
+        } else {
+                m_last_graphic_character = c_unmapped;
        }
 
        /* Make sure we have enough rows to hold this data. */
@@ -3587,6 +3590,7 @@ skip_chunk:
                        /* Call the right sequence handler for the requested
                         * behavior. */
                        handle_sequence(seq_match, params);
+                        m_last_graphic_character = 0;
 
                        /* Skip over the proper number of unicode chars. */
                        start = (next - wbuf);
@@ -7821,6 +7825,7 @@ VteTerminalPrivate::VteTerminalPrivate(VteTerminal *t) :
        m_conv_buffer = _vte_byte_array_new();
        set_encoding(nullptr /* UTF-8 */);
        g_assert_cmpstr(m_encoding, ==, "UTF-8");
+        m_last_graphic_character = 0;
 
         /* Set up the emulation. */
        m_keypad_mode = VTE_KEYMODE_NORMAL;
@@ -10004,6 +10009,7 @@ VteTerminalPrivate::reset(bool clear_tabstops,
         m_iso2022 = _vte_iso2022_state_new(nullptr);
        _vte_iso2022_state_set_codeset(m_iso2022,
                                       m_encoding);
+        m_last_graphic_character = 0;
        /* Reset keypad/cursor key modes. */
        m_keypad_mode = VTE_KEYMODE_NORMAL;
        m_cursor_mode = VTE_KEYMODE_NORMAL;
diff --git a/src/vteinternal.hh b/src/vteinternal.hh
index a20e89f..2939b0c 100644
--- a/src/vteinternal.hh
+++ b/src/vteinternal.hh
@@ -295,6 +295,7 @@ public:
         struct _vte_iso2022_state *m_iso2022;
         _vte_incoming_chunk_t *m_incoming; /* pending bytestream */
         GArray *m_pending;                 /* pending characters */
+        gunichar m_last_graphic_character; /* for REP */
         /* Array of dirty rectangles in view coordinates; need to
          * add allocation origin and padding when passing to gtk.
          */
diff --git a/src/vteseq-n.gperf b/src/vteseq-n.gperf
index eec89ae..7cd1de5 100644
--- a/src/vteseq-n.gperf
+++ b/src/vteseq-n.gperf
@@ -28,7 +28,7 @@ struct vteseq_n_struct {
 "tab", VTE_SEQUENCE_HANDLER(vte_sequence_handler_tab)
 "index", VTE_SEQUENCE_HANDLER(vte_sequence_handler_index)
 "decset", VTE_SEQUENCE_HANDLER(vte_sequence_handler_decset)
-#"repeat", VTE_SEQUENCE_HANDLER_NULL
+"repeat", VTE_SEQUENCE_HANDLER(vte_sequence_handler_repeat)
 "tab-set", VTE_SEQUENCE_HANDLER(vte_sequence_handler_tab_set)
 "decreset", VTE_SEQUENCE_HANDLER(vte_sequence_handler_decreset)
 "set-mode", VTE_SEQUENCE_HANDLER(vte_sequence_handler_set_mode)
diff --git a/src/vteseq.cc b/src/vteseq.cc
index 5f8a618..45fdcc2 100644
--- a/src/vteseq.cc
+++ b/src/vteseq.cc
@@ -1572,6 +1572,24 @@ vte_sequence_handler_insert_blank_characters (VteTerminalPrivate *that, GValueAr
         vte_sequence_handler_multiple_r(that, params, _vte_sequence_handler_insert_character);
 }
 
+/* Repeat the last graphic character once. */
+static void
+vte_sequence_handler_repeat_internal (VteTerminalPrivate *that, GValueArray *params)
+{
+        if (that->m_last_graphic_character != 0)
+                that->insert_char (that->m_last_graphic_character, false, true);
+}
+
+/* REP: Repeat the last graphic character n times. */
+static void
+vte_sequence_handler_repeat (VteTerminalPrivate *that, GValueArray *params)
+{
+        vte_sequence_handler_multiple_limited (that,
+                                               params,
+                                               vte_sequence_handler_repeat_internal,
+                                               65535);
+}
+
 /* Cursor down 1 line, with scrolling. */
 static void
 vte_sequence_handler_index (VteTerminalPrivate *that, GValueArray *params)