fdupes  2.1.2
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ncurses-prompt.c
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1 /* FDUPES Copyright (c) 2018 Adrian Lopez
2 
3  Permission is hereby granted, free of charge, to any person
4  obtaining a copy of this software and associated documentation files
5  (the "Software"), to deal in the Software without restriction,
6  including without limitation the rights to use, copy, modify, merge,
7  publish, distribute, sublicense, and/or sell copies of the Software,
8  and to permit persons to whom the Software is furnished to do so,
9  subject to the following conditions:
10 
11  The above copyright notice and this permission notice shall be
12  included in all copies or substantial portions of the Software.
13 
14  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
18  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
19  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
20  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
21 
22 #include "config.h"
23 #include <stdlib.h>
24 #include "ncurses-print.h"
25 #include "ncurses-prompt.h"
26 
27 struct prompt_info *prompt_info_alloc(size_t initial_size)
28 {
29  struct prompt_info *out;
30 
31  if (initial_size < 1)
32  return 0;
33 
34  out = (struct prompt_info*) malloc(sizeof(struct prompt_info));
35  if (out == 0)
36  return 0;
37 
38  out->text = malloc(initial_size * sizeof(wchar_t));
39  if (out->text == 0)
40  {
41  free(out);
42  return 0;
43  }
44 
45  out->text[0] = L'\0';
46  out->allocated = initial_size;
47  out->offset = 0;
48  out->cursor = 0;
49  out->active = 0;
50 
51  return out;
52 }
53 
54 void free_prompt_info(struct prompt_info *info)
55 {
56  free(info->text);
57  free(info);
58 }
59 
60 int format_prompt(struct prompt_info *prompt, wchar_t *format, ...)
61 {
62  va_list ap;
63  va_list aq;
64  int size;
65  wchar_t *newtext;
66 
67  va_start(ap, format);
68  va_copy(aq, ap);
69 
70  size = vwprintflength(format, aq);
71 
72  if (size + 3 > prompt->allocated)
73  {
74  newtext = (wchar_t*)realloc(prompt->text, (size + 3) * sizeof(wchar_t));
75 
76  if (newtext == 0)
77  return 0;
78 
79  prompt->text = newtext;
80  prompt->allocated = size + 1;
81  }
82 
83  vswprintf(prompt->text, prompt->allocated, format, ap);
84 
85  size = wcslen(prompt->text);
86 
87  prompt->text[size + 0] = L':';
88  prompt->text[size + 1] = L' ';
89  prompt->text[size + 2] = L'\0';
90 
91  va_end(aq);
92  va_end(ap);
93 
94  return 1;
95 }
96 
97 void set_prompt_active_state(struct prompt_info *prompt, int active)
98 {
99  prompt->active = active;
100 }
101 
102 void update_prompt(WINDOW *promptwin, struct prompt_info *prompt, wchar_t *commandbuffer, int cursor_delta)
103 {
104  const size_t cursor_stop = wcslen(prompt->text);
105  const size_t right_edge = getmaxx(promptwin);
106  const size_t cursor_position = cursor_stop + prompt->cursor - prompt->offset;
107 
108  if (cursor_delta > 0)
109  {
110  if (prompt->cursor + cursor_delta > wcslen(commandbuffer))
111  cursor_delta = wcslen(commandbuffer) - prompt->cursor;
112 
113  if (cursor_position + cursor_delta >= right_edge)
114  prompt->offset += cursor_delta;
115  }
116  else if (cursor_delta < 0)
117  {
118  if (-cursor_delta > prompt->cursor)
119  cursor_delta = -(int)prompt->cursor;
120 
121  if (cursor_position + cursor_delta < cursor_stop)
122  prompt->offset += cursor_delta;
123  }
124 
125  prompt->cursor += cursor_delta;
126 }
127 
128 void print_prompt(WINDOW *promptwin, struct prompt_info *prompt, wchar_t *commandbuffer)
129 {
130  if (prompt->active)
131  prompt->text[wcslen(prompt->text) - 2] = '=';
132  else
133  prompt->text[wcslen(prompt->text) - 2] = ':';
134 
135  werase(promptwin);
136 
137  if (prompt->offset <= wcslen(prompt->text))
138  {
139  wattron(promptwin, A_BOLD);
140  waddwstr(promptwin, prompt->text + prompt->offset);
141  wattroff(promptwin, A_BOLD);
142 
143  waddwstr(promptwin, commandbuffer);
144  }
145  else if (prompt->offset < wcslen(prompt->text) + wcslen(commandbuffer))
146  {
147  waddwstr(promptwin, commandbuffer + prompt->offset - wcslen(prompt->text));
148  }
149 }
set_prompt_active_state
void set_prompt_active_state(struct prompt_info *prompt, int active)
Definition: ncurses-prompt.c:97
ncurses-print.h
vwprintflength
int vwprintflength(const wchar_t *format, va_list args)
Definition: ncurses-print.c:128
prompt_info_alloc
struct prompt_info * prompt_info_alloc(size_t initial_size)
Definition: ncurses-prompt.c:27
prompt_info
Definition: ncurses-prompt.h:33
prompt_info::offset
size_t offset
Definition: ncurses-prompt.h:36
prompt_info::cursor
size_t cursor
Definition: ncurses-prompt.h:37
format_prompt
int format_prompt(struct prompt_info *prompt, wchar_t *format,...)
Definition: ncurses-prompt.c:60
print_prompt
void print_prompt(WINDOW *promptwin, struct prompt_info *prompt, wchar_t *commandbuffer)
Definition: ncurses-prompt.c:128
free_prompt_info
void free_prompt_info(struct prompt_info *info)
Definition: ncurses-prompt.c:54
prompt_info::allocated
size_t allocated
Definition: ncurses-prompt.h:35
prompt_info::text
wchar_t * text
Definition: ncurses-prompt.h:34
update_prompt
void update_prompt(WINDOW *promptwin, struct prompt_info *prompt, wchar_t *commandbuffer, int cursor_delta)
Definition: ncurses-prompt.c:102
prompt_info::active
int active
Definition: ncurses-prompt.h:38
ncurses-prompt.h