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1# Copyright 2010 Wincent Colaiuta. All rights reserved.
2#
3# Redistribution and use in source and binary forms, with or without
4# modification, are permitted provided that the following conditions are met:
5#
6# 1. Redistributions of source code must retain the above copyright notice,
7# this list of conditions and the following disclaimer.
8# 2. Redistributions in binary form must reproduce the above copyright notice,
9# this list of conditions and the following disclaimer in the documentation
10# and/or other materials provided with the distribution.
11#
12# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
13# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
14# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
15# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
16# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
17# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
18# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
19# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
20# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
21# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
22# POSSIBILITY OF SUCH DAMAGE.
23
24module CommandT
25 # Abuse the status line as a prompt.
26 class Prompt
27 attr_accessor :abbrev
28
29 def initialize
30 @abbrev = '' # abbreviation entered so far
31 @col = 0 # cursor position
32 @has_focus = false
33 end
34
35 # Erase whatever is displayed in the prompt line,
36 # effectively disposing of the prompt
37 def dispose
38 ::VIM::command 'echo'
39 ::VIM::command 'redraw'
40 end
41
42 # Clear any entered text.
43 def clear!
44 @abbrev = ''
45 @col = 0
46 redraw
47 end
48
49 # Insert a character at (before) the current cursor position.
50 def add! char
51 left, cursor, right = abbrev_segments
52 @abbrev = left + char + cursor + right
53 @col += 1
54 redraw
55 end
56
57 # Delete a character to the left of the current cursor position.
58 def backspace!
59 if @col > 0
60 left, cursor, right = abbrev_segments
61 @abbrev = left.chop! + cursor + right
62 @col -= 1
63 redraw
64 end
65 end
66
67 # Delete a character at the current cursor position.
68 def delete!
69 if @col < @abbrev.length
70 left, cursor, right = abbrev_segments
71 @abbrev = left + right
72 redraw
73 end
74 end
75
76 def cursor_left
77 if @col > 0
78 @col -= 1
79 redraw
80 end
81 end
82
83 def cursor_right
84 if @col < @abbrev.length
85 @col += 1
86 redraw
87 end
88 end
89
90 def cursor_end
91 if @col < @abbrev.length
92 @col = @abbrev.length
93 redraw
94 end
95 end
96
97 def cursor_start
98 if @col != 0
99 @col = 0
100 redraw
101 end
102 end
103
104 def redraw
105 if @has_focus
106 prompt_highlight = 'Comment'
107 normal_highlight = 'None'
108 cursor_highlight = 'Underlined'
109 else
110 prompt_highlight = 'NonText'
111 normal_highlight = 'NonText'
112 cursor_highlight = 'NonText'
113 end
114 left, cursor, right = abbrev_segments
115 components = [prompt_highlight, '>>', 'None', ' ']
116 components += [normal_highlight, left] unless left.empty?
117 components += [cursor_highlight, cursor] unless cursor.empty?
118 components += [normal_highlight, right] unless right.empty?
119 components += [cursor_highlight, ' '] if cursor.empty?
120 set_status *components
121 end
122
123 def focus
124 unless @has_focus
125 @has_focus = true
126 redraw
127 end
128 end
129
130 def unfocus
131 if @has_focus
132 @has_focus = false
133 redraw
134 end
135 end
136
137 private
138
139 # Returns the @abbrev string divided up into three sections, any of
140 # which may actually be zero width, depending on the location of the
141 # cursor:
142 # - left segment (to left of cursor)
143 # - cursor segment (character at cursor)
144 # - right segment (to right of cursor)
145 def abbrev_segments
146 left = @abbrev[0, @col]
147 cursor = @abbrev[@col, 1]
148 right = @abbrev[(@col + 1)..-1] || ''
149 [left, cursor, right]
150 end
151
152 def set_status *args
153 # see ':help :echo' for why forcing a redraw here helps
154 # prevent the status line from getting inadvertantly cleared
155 # after our echo commands
156 ::VIM::command 'redraw'
157 while (highlight = args.shift) and (text = args.shift) do
158 text = VIM::escape_for_single_quotes text
159 ::VIM::command "echohl #{highlight}"
160 ::VIM::command "echon '#{text}'"
161 end
162 ::VIM::command 'echohl None'
163 end
164 end # class Prompt
165end # module CommandT