1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
#include "readline_buffer.h"
#include <readline/readline.h>
#include <readline/history.h>
#include <sys/select.h>
#include <unistd.h>
#include <mutex>
#include <condition_variable>
#include <boost/thread.hpp>
#include <boost/algorithm/string.hpp>
static int process_input();
static void install_line_handler();
static void remove_line_handler();
static std::string last_line;
static std::string last_prompt;
std::mutex line_mutex, sync_mutex, process_mutex;
std::condition_variable have_line;
std::vector<std::string> rdln::readline_buffer::completion_commands = {"exit"};
namespace
{
rdln::readline_buffer* current = NULL;
}
rdln::suspend_readline::suspend_readline()
: m_buffer(NULL), m_restart(false)
{
m_buffer = current;
if(!m_buffer)
return;
m_restart = m_buffer->is_running();
if(m_restart)
m_buffer->stop();
}
rdln::suspend_readline::~suspend_readline()
{
if(!m_buffer)
return;
if(m_restart)
m_buffer->start();
}
rdln::readline_buffer::readline_buffer()
: std::stringbuf(), m_cout_buf(NULL)
{
current = this;
}
void rdln::readline_buffer::start()
{
std::unique_lock<std::mutex> lock(process_mutex);
if(m_cout_buf != NULL)
return;
m_cout_buf = std::cout.rdbuf();
std::cout.rdbuf(this);
install_line_handler();
}
void rdln::readline_buffer::stop()
{
std::unique_lock<std::mutex> lock(process_mutex);
if(m_cout_buf == NULL)
return;
std::cout.rdbuf(m_cout_buf);
m_cout_buf = NULL;
remove_line_handler();
}
void rdln::readline_buffer::get_line(std::string& line) const
{
std::unique_lock<std::mutex> lock(line_mutex);
have_line.wait(lock);
line = last_line;
}
void rdln::readline_buffer::set_prompt(const std::string& prompt)
{
last_prompt = prompt;
if(m_cout_buf == NULL)
return;
std::lock_guard<std::mutex> lock(sync_mutex);
rl_set_prompt(last_prompt.c_str());
rl_redisplay();
}
int rdln::readline_buffer::process()
{
process_mutex.lock();
if(m_cout_buf == NULL)
{
process_mutex.unlock();
boost::this_thread::sleep_for(boost::chrono::milliseconds( 1 ));
return 0;
}
int count = process_input();
process_mutex.unlock();
boost::this_thread::sleep_for(boost::chrono::milliseconds( 1 ));
return count;
}
int rdln::readline_buffer::sync()
{
std::lock_guard<std::mutex> lock(sync_mutex);
char* saved_line;
int saved_point;
saved_point = rl_point;
saved_line = rl_copy_text(0, rl_end);
rl_set_prompt("");
rl_replace_line("", 0);
rl_redisplay();
do
{
m_cout_buf->sputc( this->sgetc() );
}
while ( this->snextc() != EOF );
rl_set_prompt(last_prompt.c_str());
rl_replace_line(saved_line, 0);
rl_point = saved_point;
rl_redisplay();
free(saved_line);
return 0;
}
static int process_input()
{
int count;
struct timeval t;
fd_set fds;
t.tv_sec = 0;
t.tv_usec = 1000;
FD_ZERO(&fds);
FD_SET(STDIN_FILENO, &fds);
count = select(STDIN_FILENO + 1, &fds, NULL, NULL, &t);
if (count < 1)
{
return count;
}
rl_callback_read_char();
return count;
}
static void handle_line(char* line)
{
if(last_line == "exit" || last_line == "q")
{
return;
}
std::lock_guard<std::mutex> lock(sync_mutex);
rl_set_prompt(last_prompt.c_str());
rl_already_prompted = 1;
}
static int handle_enter(int x, int y)
{
std::lock_guard<std::mutex> lock(sync_mutex);
char* line = NULL;
line = rl_copy_text(0, rl_end);
rl_crlf();
rl_on_new_line();
rl_set_prompt("");
rl_replace_line("", 1);
rl_redisplay();
std::string test_line = line;
boost::trim_right(test_line);
if (test_line.length() > 0)
{
last_line = test_line;
add_history(test_line.c_str());
have_line.notify_one();
}
free(line);
if(last_line != "exit" && last_line != "q")
{
rl_set_prompt(last_prompt.c_str());
rl_on_new_line_with_prompt();
rl_redisplay();
}
rl_done = 1;
return 0;
}
static int startup_hook()
{
rl_bind_key(RETURN, handle_enter);
rl_bind_key(NEWLINE, handle_enter);
return 0;
}
static char* completion_matches(const char* text, int state)
{
static size_t list_index;
static size_t len;
if(state == 0)
{
list_index = 0;
len = strlen(text);
}
const std::vector<std::string>& completions = rdln::readline_buffer::get_completions();
for(; list_index<completions.size(); )
{
const std::string& cmd = completions[list_index++];
if(cmd.compare(0, len, text) == 0)
{
return strdup(cmd.c_str());
}
}
return NULL;
}
static char** attempted_completion(const char* text, int start, int end)
{
rl_attempted_completion_over = 1;
return rl_completion_matches(text, completion_matches);
}
static void install_line_handler()
{
rl_startup_hook = startup_hook;
rl_attempted_completion_function = attempted_completion;
rl_callback_handler_install("", handle_line);
}
static void remove_line_handler()
{
rl_replace_line("", 0);
rl_set_prompt("");
rl_redisplay();
rl_unbind_key(RETURN);
rl_unbind_key(NEWLINE);
rl_callback_handler_remove();
}
|
