[ruby/reline] Add terminfo support

https://github.com/ruby/reline/commit/74a7ffaa2f

lib/reline/ansi.rb

@@ -1,7 +1,12 @@
 require 'io/console'
 require 'timeout'
+require_relative 'terminfo'
 
 class Reline::ANSI
+  if Reline::Terminfo.enabled?
+    Reline::Terminfo.setupterm(0, 2)
+  end
+
   def self.encoding
     Encoding.default_external
   end
@@ -11,6 +16,51 @@ class Reline::ANSI
   end
 
   def self.set_default_key_bindings(config)
+    if Reline::Terminfo.enabled?
+      set_default_key_bindings_terminfo(config)
+    else
+      set_default_key_bindings_comprehensive_list(config)
+    end
+    {
+      # extended entries of terminfo
+      [27, 91, 49, 59, 53, 67] => :em_next_word, # Ctrl+→, extended entry
+      [27, 91, 49, 59, 53, 68] => :ed_prev_word, # Ctrl+←, extended entry
+    }.each_pair do |key, func|
+      config.add_default_key_binding_by_keymap(:emacs, key, func)
+      config.add_default_key_binding_by_keymap(:vi_insert, key, func)
+      config.add_default_key_binding_by_keymap(:vi_command, key, func)
+    end
+    {
+      # default bindings
+      [27, 32] => :em_set_mark,             # M-<space>
+      [24, 24] => :em_exchange_mark,        # C-x C-x TODO also add Windows
+    }.each_pair do |key, func|
+      config.add_default_key_binding_by_keymap(:emacs, key, func)
+    end
+  end
+
+  def self.set_default_key_bindings_terminfo(config)
+    {
+      Reline::Terminfo.tigetstr('khome').to_s.bytes => :ed_move_to_beg,
+      Reline::Terminfo.tigetstr('kend').to_s.bytes => :ed_move_to_end,
+      Reline::Terminfo.tigetstr('kcuu1').to_s.bytes => :ed_prev_history,
+      Reline::Terminfo.tigetstr('kcud1').to_s.bytes => :ed_next_history,
+      Reline::Terminfo.tigetstr('kcuf1').to_s.bytes => :ed_next_char,
+      Reline::Terminfo.tigetstr('kcub1').to_s.bytes => :ed_prev_char,
+      # Escape sequences that omit the move distance and are set to defaults
+      # value 1 may be sometimes sent by pressing the arrow-key.
+      Reline::Terminfo.tigetstr('cuu').to_s.sub(/%p1%d/, '').bytes => :ed_prev_history,
+      Reline::Terminfo.tigetstr('cud').to_s.sub(/%p1%d/, '').bytes => :ed_next_history,
+      Reline::Terminfo.tigetstr('cuf').to_s.sub(/%p1%d/, '').bytes => :ed_next_char,
+      Reline::Terminfo.tigetstr('cub').to_s.sub(/%p1%d/, '').bytes => :ed_prev_char,
+    }.each_pair do |key, func|
+      config.add_default_key_binding_by_keymap(:emacs, key, func)
+      config.add_default_key_binding_by_keymap(:vi_insert, key, func)
+      config.add_default_key_binding_by_keymap(:vi_command, key, func)
+    end
+  end
+
+  def self.set_default_key_bindings_comprehensive_list(config)
     {
       # Console (80x25)
       [27, 91, 49, 126] => :ed_move_to_beg, # Home
@@ -41,15 +91,11 @@ class Reline::ANSI
       # Arrow keys are the same of KDE
 
       # iTerm2
-      [27, 27, 91, 67] => :em_next_word,    # Option+→
-      [27, 27, 91, 68] => :ed_prev_word,    # Option+←
+      [27, 27, 91, 67] => :em_next_word,    # Option+→, extended entry
+      [27, 27, 91, 68] => :ed_prev_word,    # Option+←, extended entry
       [195, 166] => :em_next_word,          # Option+f
       [195, 162] => :ed_prev_word,          # Option+b
 
-      # others
-      [27, 91, 49, 59, 53, 67] => :em_next_word, # Ctrl+→
-      [27, 91, 49, 59, 53, 68] => :ed_prev_word, # Ctrl+←
-
       [27, 79, 65] => :ed_prev_history,     # ↑
       [27, 79, 66] => :ed_next_history,     # ↓
       [27, 79, 67] => :ed_next_char,        # →
@@ -59,14 +105,6 @@ class Reline::ANSI
       config.add_default_key_binding_by_keymap(:vi_insert, key, func)
       config.add_default_key_binding_by_keymap(:vi_command, key, func)
     end
-
-    {
-      # others
-      [27, 32] => :em_set_mark,             # M-<space>
-      [24, 24] => :em_exchange_mark,        # C-x C-x TODO also add Windows
-    }.each_pair do |key, func|
-      config.add_default_key_binding_by_keymap(:emacs, key, func)
-    end
   end
 
   @@input = STDIN

lib/reline/terminfo.rb

@@ -0,0 +1,80 @@
+require 'fiddle'
+require 'fiddle/import'
+
+module Reline::Terminfo
+  extend Fiddle::Importer
+
+  class TerminfoError < StandardError; end
+
+  @curses_dl = nil
+  def self.curses_dl
+    return @curses_dl if @curses_dl
+    if Gem::Version.create(Fiddle::VERSION) >= Gem::Version.create('1.0.1')
+      # Fiddle::TYPE_VARIADIC is supported from Fiddle 1.0.1.
+      %w[libncursesw.so libcursesw.so libncurses.so libcurses.so].each do |curses_name|
+        result = Fiddle::Handle.new(curses_name)
+      rescue Fiddle::DLError
+        next
+      else
+        @curses_dl = result
+        break
+      end
+    end
+    @curses_dl
+  end
+end
+
+module Reline::Terminfo
+  dlload curses_dl
+  #extern 'int setupterm(char *term, int fildes, int *errret)'
+  @setupterm = Fiddle::Function.new(curses_dl['setupterm'], [Fiddle::TYPE_VOIDP, Fiddle::TYPE_INT, Fiddle::TYPE_VOIDP], Fiddle::TYPE_INT)
+  #extern 'char *tigetstr(char *capname)'
+  @tigetstr = Fiddle::Function.new(curses_dl['tigetstr'], [Fiddle::TYPE_VOIDP], Fiddle::TYPE_VOIDP)
+  #extern 'char *tiparm(const char *str, ...)'
+  @tiparm = Fiddle::Function.new(curses_dl['tiparm'], [Fiddle::TYPE_VOIDP, Fiddle::TYPE_VARIADIC], Fiddle::TYPE_VOIDP)
+
+  def self.setupterm(term, fildes)
+    errret_int = String.new("\x00" * 8, encoding: 'ASCII-8BIT')
+    ret = @setupterm.(term, fildes, errret_int)
+    errret = errret_int.unpack('i')[0]
+    case ret
+    when 0 # OK
+      0
+    when -1 # ERR
+      case errret
+      when 1
+        raise TerminfoError.new('The terminal is hardcopy, cannot be used for curses applications.')
+      when 0
+        raise TerminfoError.new('The terminal could not be found, or that it is a generic type, having too little information for curses applications to run.')
+      when -1
+        raise TerminfoError.new('The terminfo database could not be found.')
+      else # unknown
+        -1
+      end
+    else # unknown
+      -2
+    end
+  end
+
+  def self.tigetstr(capname)
+    @tigetstr.(capname)
+  end
+
+  def self.tiparm(str, *args)
+    new_args = []
+    args.each do |a|
+      new_args << Fiddle::TYPE_INT << a
+    end
+    @tiparm.(str, *new_args)
+  end
+
+  def self.enabled?
+    true
+  end
+end if Reline::Terminfo.curses_dl
+
+module Reline::Terminfo
+  def self.enabled?
+    false
+  end
+end unless Reline::Terminfo.curses_dl