Support completion with case-insensitive fashion

Reline performs completion in a case-insensitive fashon if
Readline.completion_case_fold or completion-ignore-case of .inputrc are set
"on".

2 files changed, 26 insertions, 9 deletions

diff --git a/lib/reline.rb b/lib/reline.rb
index 229c41a9a8..2036ec7024 100644
--- a/lib/reline.rb
+++ b/lib/reline.rb
@@ -32,10 +32,6 @@ module Reline
       dig_perfect_match_proc
     ).each(&method(:attr_reader))
 
-    ATTR_ACCESSOR_NAMES = %i(
-      completion_case_fold
-    ).each(&method(:attr_accessor))
-
     attr_accessor :config
     attr_accessor :key_stroke
     attr_accessor :line_editor
@@ -84,6 +80,14 @@ module Reline
       @special_prefixes = v.encode(Encoding::default_external)
     end
 
+    def completion_case_fold=(v)
+      @config.completion_ignore_case = v
+    end
+
+    def completion_case_fold
+      @config.completion_ignore_case
+    end
+
     def completion_proc=(p)
       raise ArgumentError unless p.respond_to?(:call)
       @completion_proc = p
@@ -336,12 +340,13 @@ module Reline
   # Documented API
   #--------------------------------------------------------
 
-  (Core::ATTR_READER_NAMES + Core::ATTR_ACCESSOR_NAMES).each { |name|
+  (Core::ATTR_READER_NAMES).each { |name|
     def_single_delegators :core, "#{name}", "#{name}="
   }
   def_single_delegators :core, :input=, :output=
   def_single_delegators :core, :vi_editing_mode, :emacs_editing_mode
   def_single_delegators :core, :readline
+  def_single_delegators :core, :completion_case_fold, :completion_case_fold=
   def_instance_delegators self, :readline
   private :readline
 
diff --git a/lib/reline/line_editor.rb b/lib/reline/line_editor.rb
index e352f8881c..2986bdd154 100644
--- a/lib/reline/line_editor.rb
+++ b/lib/reline/line_editor.rb
@@ -552,7 +552,11 @@ class Reline::LineEditor
       if i and not Encoding.compatible?(target.encoding, i.encoding)
         raise Encoding::CompatibilityError
       end
-      i&.start_with?(target)
+      if @config.completion_ignore_case
+        i&.downcase.start_with?(target.downcase)
+      else
+        i&.start_with?(target)
+      end
     }
     if is_menu
       menu(target, list)
@@ -569,10 +573,18 @@ class Reline::LineEditor
       size = [memo_mbchars.size, item_mbchars.size].min
       result = ''
       size.times do |i|
-        if memo_mbchars[i] == item_mbchars[i]
-          result << memo_mbchars[i]
+        if @config.completion_ignore_case
+          if memo_mbchars[i].casecmp?(item_mbchars[i])
+            result << memo_mbchars[i]
+          else
+            break
+          end
         else
-          break
+          if memo_mbchars[i] == item_mbchars[i]
+            result << memo_mbchars[i]
+          else
+            break
+          end
         end
       end
       result