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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 | ||
24 | module 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 | |
165 | end # module CommandT |