Implement smart-case match (#12)

README.md

@@ -57,6 +57,7 @@ usage: fzf [options]
     -q, --query=STR  Initial query
     -s, --sort=MAX   Maximum number of matched items to sort. Default: 1000
     +s, --no-sort    Do not sort the result. Keep the sequence unchanged.
+    -i               Case-insensitive match (default: smart-case match)
     +i               Case-sensitive match
     +c, --no-color   Disable colors
 ```

fzf

@@ -67,7 +67,7 @@ class FZF
   end
 
   def initialize argv, source = $stdin
-    @rxflag = Regexp::IGNORECASE
+    @rxflag = nil
     @sort   = ENV.fetch('FZF_DEFAULT_SORT', 1000).to_i
     @color  = true
     @multi  = false
@@ -79,6 +79,7 @@ class FZF
       when '-h', '--help'     then usage 0
       when '-m', '--multi'    then @multi  = true
       when '-x', '--extended' then @xmode  = true
+      when '-i'               then @rxflag = Regexp::IGNORECASE
       when '+i'               then @rxflag = 0
       when '+s', '--no-sort'  then @sort   = nil
       when '+c', '--no-color' then @color  = false
@@ -136,6 +137,7 @@ class FZF
     -q, --query=STR  Initial query
     -s, --sort=MAX   Maximum number of matched items to sort. Default: 1000
     +s, --no-sort    Do not sort the result. Keep the sequence unchanged.
+    -i               Case-insensitive match (default: smart-case match)
     +i               Case-sensitive match
     +c, --no-color   Disable colors]
     exit x
@@ -770,14 +772,18 @@ class FZF
       q.empty?
     end
 
+    def rxflag_for q
+      @rxflag || (q =~ /[A-Z]/ ? 0 : Regexp::IGNORECASE)
+    end
+
     def fuzzy_regex q
       @regexp[q] ||= begin
-        q = q.downcase if @rxflag != 0
+        q = q.downcase if @rxflag == Regexp::IGNORECASE
         Regexp.new(query_chars(q).inject('') { |sum, e|
           e = Regexp.escape e
           sum << (e.length > 1 ? "(?:#{e}).*?" :  # FIXME: not equivalent
                                  "#{e}[^#{e}]*?")
-        }, @rxflag)
+        }, rxflag_for(q))
       end
     end
 
@@ -830,16 +836,16 @@ class FZF
             when ''
               nil
             when /^\^(.*)\$$/
-              Regexp.new('^' << sanitize(Regexp.escape($1)) << '$', rxflag)
+              Regexp.new('^' << sanitize(Regexp.escape($1)) << '$', rxflag_for(w))
             when /^'/
               w.length > 1 ?
-                Regexp.new(sanitize(Regexp.escape(w[1..-1])), rxflag) : nil
+                Regexp.new(sanitize(Regexp.escape(w[1..-1])), rxflag_for(w)) : nil
             when /^\^/
               w.length > 1 ?
-                Regexp.new('^' << sanitize(Regexp.escape(w[1..-1])), rxflag) : nil
+                Regexp.new('^' << sanitize(Regexp.escape(w[1..-1])), rxflag_for(w)) : nil
             when /\$$/
               w.length > 1 ?
-                Regexp.new(sanitize(Regexp.escape(w[0..-2])) << '$', rxflag) : nil
+                Regexp.new(sanitize(Regexp.escape(w[0..-2])) << '$', rxflag_for(w)) : nil
             else
               fuzzy_regex w
             end, invert ]

test/test_fzf.rb

@@ -12,7 +12,7 @@ class TestFZF < MiniTest::Unit::TestCase
     assert_equal 1000,  fzf.sort
     assert_equal false, fzf.multi
     assert_equal true,  fzf.color
-    assert_equal Regexp::IGNORECASE, fzf.rxflag
+    assert_equal nil,   fzf.rxflag
 
     begin
       ENV['FZF_DEFAULT_SORT'] = '1500'
@@ -152,15 +152,59 @@ class TestFZF < MiniTest::Unit::TestCase
     # TODO : partial_cache
   end
 
+  def test_fuzzy_matcher_rxflag
+    assert_equal nil, FZF::FuzzyMatcher.new(nil).rxflag
+    assert_equal 0, FZF::FuzzyMatcher.new(0).rxflag
+    assert_equal 1, FZF::FuzzyMatcher.new(1).rxflag
+
+    assert_equal 1, FZF::FuzzyMatcher.new(nil).rxflag_for('abc')
+    assert_equal 0, FZF::FuzzyMatcher.new(nil).rxflag_for('Abc')
+    assert_equal 0, FZF::FuzzyMatcher.new(0).rxflag_for('abc')
+    assert_equal 0, FZF::FuzzyMatcher.new(0).rxflag_for('Abc')
+    assert_equal 1, FZF::FuzzyMatcher.new(1).rxflag_for('abc')
+    assert_equal 1, FZF::FuzzyMatcher.new(1).rxflag_for('Abc')
+  end
+
   def test_fuzzy_matcher_case_sensitive
+    # Smart-case match (Uppercase found)
+    assert_equal [['Fruit', [[0, 5]]]],
+      FZF::FuzzyMatcher.new(nil).match(%w[Fruit Grapefruit], 'Fruit', '', '').sort
+
+    # Smart-case match (Uppercase not-found)
+    assert_equal [["Fruit", [[0, 5]]], ["Grapefruit", [[5, 10]]]],
+      FZF::FuzzyMatcher.new(nil).match(%w[Fruit Grapefruit], 'fruit', '', '').sort
+
+    # Case-sensitive match (-i)
     assert_equal [['Fruit', [[0, 5]]]],
       FZF::FuzzyMatcher.new(0).match(%w[Fruit Grapefruit], 'Fruit', '', '').sort
 
+    # Case-insensitive match (+i)
     assert_equal [["Fruit", [[0, 5]]], ["Grapefruit", [[5, 10]]]],
       FZF::FuzzyMatcher.new(Regexp::IGNORECASE).
       match(%w[Fruit Grapefruit], 'Fruit', '', '').sort
   end
 
+  def test_extended_fuzzy_matcher_case_sensitive
+    %w['Fruit Fruit$].each do |q|
+      # Smart-case match (Uppercase found)
+      assert_equal [['Fruit', [[0, 5]]]],
+        FZF::ExtendedFuzzyMatcher.new(nil).match(%w[Fruit Grapefruit], q, '', '').sort
+
+      # Smart-case match (Uppercase not-found)
+      assert_equal [["Fruit", [[0, 5]]], ["Grapefruit", [[5, 10]]]],
+        FZF::ExtendedFuzzyMatcher.new(nil).match(%w[Fruit Grapefruit], q.downcase, '', '').sort
+
+      # Case-sensitive match (-i)
+      assert_equal [['Fruit', [[0, 5]]]],
+        FZF::ExtendedFuzzyMatcher.new(0).match(%w[Fruit Grapefruit], q, '', '').sort
+
+      # Case-insensitive match (+i)
+      assert_equal [["Fruit", [[0, 5]]], ["Grapefruit", [[5, 10]]]],
+        FZF::ExtendedFuzzyMatcher.new(Regexp::IGNORECASE).
+        match(%w[Fruit Grapefruit], q, '', '').sort
+    end
+  end
+
   def test_extended_fuzzy_matcher
     matcher = FZF::ExtendedFuzzyMatcher.new Regexp::IGNORECASE
     list = %w[