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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
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