More files, other stuff.

vimfiles/ruby/command-t/prompt.rb

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+# Copyright 2010 Wincent Colaiuta. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+#    this list of conditions and the following disclaimer in the documentation
+#    and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+module CommandT
+  # Abuse the status line as a prompt.
+  class Prompt
+    attr_accessor :abbrev
+
+    def initialize
+      @abbrev     = ''  # abbreviation entered so far
+      @col        = 0   # cursor position
+      @has_focus  = false
+    end
+
+    # Erase whatever is displayed in the prompt line,
+    # effectively disposing of the prompt
+    def dispose
+      ::VIM::command 'echo'
+      ::VIM::command 'redraw'
+    end
+
+    # Clear any entered text.
+    def clear!
+      @abbrev = ''
+      @col    = 0
+      redraw
+    end
+
+    # Insert a character at (before) the current cursor position.
+    def add! char
+      left, cursor, right = abbrev_segments
+      @abbrev = left + char + cursor + right
+      @col += 1
+      redraw
+    end
+
+    # Delete a character to the left of the current cursor position.
+    def backspace!
+      if @col > 0
+        left, cursor, right = abbrev_segments
+        @abbrev = left.chop! + cursor + right
+        @col -= 1
+        redraw
+      end
+    end
+
+    # Delete a character at the current cursor position.
+    def delete!
+      if @col < @abbrev.length
+        left, cursor, right = abbrev_segments
+        @abbrev = left + right
+        redraw
+      end
+    end
+
+    def cursor_left
+      if @col > 0
+        @col -= 1
+        redraw
+      end
+    end
+
+    def cursor_right
+      if @col < @abbrev.length
+        @col += 1
+        redraw
+      end
+    end
+
+    def cursor_end
+      if @col < @abbrev.length
+        @col = @abbrev.length
+        redraw
+      end
+    end
+
+    def cursor_start
+      if @col != 0
+        @col = 0
+        redraw
+      end
+    end
+
+    def redraw
+      if @has_focus
+        prompt_highlight = 'Comment'
+        normal_highlight = 'None'
+        cursor_highlight = 'Underlined'
+      else
+        prompt_highlight = 'NonText'
+        normal_highlight = 'NonText'
+        cursor_highlight = 'NonText'
+      end
+      left, cursor, right = abbrev_segments
+      components = [prompt_highlight, '>>', 'None', ' ']
+      components += [normal_highlight, left] unless left.empty?
+      components += [cursor_highlight, cursor] unless cursor.empty?
+      components += [normal_highlight, right] unless right.empty?
+      components += [cursor_highlight, ' '] if cursor.empty?
+      set_status *components
+    end
+
+    def focus
+      unless @has_focus
+        @has_focus = true
+        redraw
+      end
+    end
+
+    def unfocus
+      if @has_focus
+        @has_focus = false
+        redraw
+      end
+    end
+
+  private
+
+    # Returns the @abbrev string divided up into three sections, any of
+    # which may actually be zero width, depending on the location of the
+    # cursor:
+    #   - left segment (to left of cursor)
+    #   - cursor segment (character at cursor)
+    #   - right segment (to right of cursor)
+    def abbrev_segments
+      left    = @abbrev[0, @col]
+      cursor  = @abbrev[@col, 1]
+      right   = @abbrev[(@col + 1)..-1] || ''
+      [left, cursor, right]
+    end
+
+    def set_status *args
+      # see ':help :echo' for why forcing a redraw here helps
+      # prevent the status line from getting inadvertantly cleared
+      # after our echo commands
+      ::VIM::command 'redraw'
+      while (highlight = args.shift) and  (text = args.shift) do
+        text = VIM::escape_for_single_quotes text
+        ::VIM::command "echohl #{highlight}"
+        ::VIM::command "echon '#{text}'"
+      end
+      ::VIM::command 'echohl None'
+    end
+  end # class Prompt
+end # module CommandT