erebus: 5e27c85e79ca src/console.cc

erebus

view src/console.cc @ 38:5e27c85e79ca

cursor handling in the console

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 09 Jun 2014 18:40:30 +0300
parents	db8a90307386
children	9d6368850fe1

line source

1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <string.h>

4 #include <stdarg.h>

5 #include <assert.h>

6 #include <algorithm>

7 #include "opengl.h"

8 #include "console.h"

10 Console::Console()

11 {

12 visible = false;

13 nlines = 16;

14 ncolumns = 80;

16 inpq_front = inpq_back = 0;

18 max_hist_lines = 64;

19 max_output_lines = 128;

21 echo = true;

22 font = 0;

23 font_size = 0;

25 cursor = 0;

26 }

28 void Console::set_font(dtx_font *font, int sz)

29 {

30 this->font = font;

31 font_size = sz;

32 }

34 void Console::set_history_size(int hsz)

35 {

36 max_hist_lines = hsz;

38 int drop = hist.size() - hsz;

39 if(drop > 0) {

40 auto it = hist.begin();

41 for(int i=0; i<drop; i++) {

42 ++it;

43 }

44 hist.erase(hist.begin(), it);

45 }

46 }

48 void Console::set_output_buffer_size(int sz)

49 {

50 max_output_lines = sz;

52 int drop = output.size() - sz;

53 if(drop > 0) {

54 output.erase(output.begin(), output.begin() + drop);

55 }

56 }

58 void Console::set_command_func(std::function<void (const char*)> func)

59 {

60 cmd_handler = func;

61 }

63 void Console::set_echo(bool echo)

64 {

65 this->echo = echo;

66 }

68 bool Console::get_echo() const

69 {

70 return echo;

71 }

73 void Console::set_visible(bool v)

74 {

75 visible = v;

76 }

78 bool Console::is_visible() const

79 {

80 return visible;

81 }

83 void Console::set_size(int lines, int columns)

84 {

85 nlines = lines;

86 ncolumns = columns;

87 }

89 int Console::get_size_lines() const

90 {

91 return nlines;

92 }

94 int Console::get_size_columns() const

95 {

96 return ncolumns;

97 }

99 bool Console::update()

100 {

101 bool must_redraw = false;

102

103 while(inpq_front != inpq_back) {

104 int c = keybuf[inpq_front];

105 inpq_front = (inpq_front + 1) % INPUTQ_SIZE;

106

107 switch(c) {

108 case '\n':

109 case '\r':

110 if(cmd_handler) {

111 cmd_handler(input.c_str());

112 }

113

114 if(echo) {

115 puts(input.c_str());

116 putchar('\n');

117 }

118

119 hist.push_back(std::move(input)); // move the input string into the history buffer

120 if((int)hist.size() > max_hist_lines) {

121 hist.pop_front();

122 }

123 cursor = 0;

124 must_redraw = true;

125 break;

126

127 case '\t':

128 // TODO: completion

129 break;

130

131 case '\b':

132 if(!input.empty()) {

133 if(cursor == (int)input.size()) {

134 input.pop_back();

135 --cursor;

136 must_redraw = true;

137 } else if(cursor > 0) {

138 input.erase(cursor - 1, 1);

139 --cursor;

140 must_redraw = true;

141 }

142 }

143 break;

144

145 case KEY_LEFT:

146 if(cursor > 0) {

147 --cursor;

148 must_redraw = true;

149 }

150 break;

151

152 case KEY_RIGHT:

153 if(cursor < (int)input.size()) {

154 ++cursor;

155 must_redraw = true;

156 }

157 break;

158

159 case KEY_HOME:

160 cursor = 0;

161 must_redraw = true;

162 break;

163

164 case KEY_END:

165 cursor = input.size();

166 must_redraw = true;

167 break;

168

169 case KEY_PGUP:

170 case KEY_PGDOWN:

171 // TODO history

172 break;

173

174 default:

175 if(c < 256 && isprint(c)) {

176 if(cursor == (int)input.size()) {

177 input.push_back(c);

178 } else {

179 input.insert(cursor, 1, c);

180 }

181 ++cursor;

182 must_redraw = true;

183 }

184 }

185 }

186 return must_redraw;

187 }

188

189 void Console::draw() const

190 {

191 if(!font || !visible) return;

192 dtx_use_font(font, font_size);

193

194 int vp[4];

195 glGetIntegerv(GL_VIEWPORT, vp);

196

197 glMatrixMode(GL_PROJECTION);

198 glPushMatrix();

199 glLoadIdentity();

200 glOrtho(vp[0], vp[0] + vp[2], vp[1], vp[1] + vp[3], -1, 1);

201

202 glMatrixMode(GL_MODELVIEW);

203 glPushMatrix();

204 glLoadIdentity();

205 glTranslatef(0, vp[3] - vp[1], 0);

206

207 std::string buflines;

208

209 int num_lines = std::min(nlines, (int)output.size());

210 auto it = output.cbegin() + (output.size() - num_lines);

211

212 float max_width = dtx_glyph_width('Q') * ncolumns;

213

214 while(it != output.cend()) {

215 const std::string &line = *it++;

216 buflines += line + std::string("\n");

217

218 max_width = std::max(max_width, dtx_string_width(line.c_str()));

219 }

220

221 // draw the output box

222 float line_height = dtx_line_height();

223 float outbox_height = nlines * line_height;

224

225 glPushAttrib(GL_ENABLE_BIT);

226 glEnable(GL_BLEND);

227 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

228

229 glBegin(GL_QUADS);

230 glColor4f(0.1, 0.2, 0.5, 0.7);

231 glVertex2f(0, -outbox_height);

232 glVertex2f(max_width, -outbox_height);

233 glVertex2f(max_width, 0);

234 glVertex2f(0, 0);

235

236 glColor4f(0.5, 0.2, 0.1, 0.7);

237 glVertex2f(0, -(outbox_height + line_height));

238 glVertex2f(max_width, -(outbox_height + line_height));

239 glVertex2f(max_width, -outbox_height);

240 glVertex2f(0, -outbox_height);

241 glEnd();

242

243 // draw the output text

244 glPushMatrix();

245 glTranslatef(0, -line_height, 0);

246 glColor4f(1, 1, 1, 0.7);

247 dtx_string(buflines.c_str());

248 glPopMatrix();

249

250 // draw the input line

251 glTranslatef(0, -outbox_height - line_height, 0);

252

253 std::string inpline = std::string("> ") + input;

254 dtx_string(inpline.c_str());

255 glDisable(GL_TEXTURE_2D);

256

257 float cursor_x = dtx_char_pos(inpline.c_str(), cursor + 2);

258 glBegin(GL_QUADS);

259 glColor4f(1, 1, 1, 0.7);

260 glVertex2f(cursor_x, 2);

261 glVertex2f(cursor_x + 2, 2);

262 glVertex2f(cursor_x + 2, line_height - 2);

263 glVertex2f(cursor_x, line_height - 2);

264 glEnd();

265

266 glPopAttrib();

267

268 glMatrixMode(GL_PROJECTION);

269 glPopMatrix();

270 glMatrixMode(GL_MODELVIEW);

271 glPopMatrix();

272 }

273

274 void Console::input_key(int key)

275 {

276 keybuf[inpq_back] = key;

277 inpq_back = (inpq_back + 1) % INPUTQ_SIZE;

278 }

279

280 void Console::putchar(char c)

281 {

282 if(output.empty()) {

283 output.push_back(std::string(""));

284 }

285

286 if(c == '\n' || c == '\r') {

287 output.push_back(std::string(""));

288 if((int)output.size() > max_output_lines) {

289 output.erase(output.begin());

290 }

291 } else {

292 output.back().push_back(c);

293 }

294 }

295

296 void Console::puts(const char *str)

297 {

298 while(*str) {

299 putchar(*str++);

300 }

301 }

302

303 void Console::printf(const char *fmt, ...)

304 {

305 static char buf[1024];

306 va_list ap;

307

308 va_start(ap, fmt);

309 vsnprintf(buf, sizeof buf, fmt, ap);

310 va_end(ap);

311

312 puts(buf);

313 }

314

315 void Console::debug()

316 {

317 fprintf(stderr, "visible: %s\n", visible ? "true" : "false");

318 fprintf(stderr, "size: %d lines x %d columns\n", nlines, ncolumns);

319 fprintf(stderr, "cursor: %d\n", cursor);

320

321 int qsize = 0;

322 int qidx = inpq_front;

323 while(qidx != inpq_back) {

324 qsize++;

325 qidx = (qidx + 1) % INPUTQ_SIZE;

326 }

327

328 fprintf(stderr, "input queue size: %d\n", qsize);

329 fprintf(stderr, "current input line: \"%s\"\n", input.c_str());

330 fprintf(stderr, "%d saved inputs in the history (max %d)\n", (int)hist.size(), max_hist_lines);

331 auto it = hist.begin();

332 int idx = 0;

333 while(it != hist.end()) {

334 fprintf(stderr, " h(%d): \"%s\"\n", idx++, it++->c_str());

335 }

336

337 fprintf(stderr, "output buffer (lines: %d/%d):\n", (int)output.size(), max_output_lines);

338 for(size_t i=0; i<output.size(); i++) {

339 fprintf(stderr, "o(%d): \"%s\"\n", (int)i, output[i].c_str());

340 }

341 }