erebus: db8a90307386 src/console.cc

erebus

view src/console.cc @ 37:db8a90307386

implemented console and rudimentary commandline parser

author	John Tsiombikas <nuclear@member.fsf.org>
date	Mon, 09 Jun 2014 16:01:00 +0300
parents
children	5e27c85e79ca

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);

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 input.push_back(c);

177 ++cursor;

178 must_redraw = true;

179 }

180 }

181 }

182 return must_redraw;

183 }

184

185 void Console::draw() const

186 {

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

188 dtx_use_font(font, font_size);

189

190 int vp[4];

191 glGetIntegerv(GL_VIEWPORT, vp);

192

193 glMatrixMode(GL_PROJECTION);

194 glPushMatrix();

195 glLoadIdentity();

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

197

198 glMatrixMode(GL_MODELVIEW);

199 glPushMatrix();

200 glLoadIdentity();

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

202

203 std::string buflines;

204

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

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

207

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

209

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

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

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

213

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

215 }

216

217 // draw the output box

218 float outbox_height = nlines * dtx_line_height();

219

220 glPushAttrib(GL_ENABLE_BIT);

221 glEnable(GL_BLEND);

222 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

223

224 glBegin(GL_QUADS);

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

226 glVertex2f(0, -outbox_height);

227 glVertex2f(max_width, -outbox_height);

228 glVertex2f(max_width, 0);

229 glVertex2f(0, 0);

230

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

232 glVertex2f(0, -(outbox_height + dtx_line_height()));

233 glVertex2f(max_width, -(outbox_height + dtx_line_height()));

234 glVertex2f(max_width, -outbox_height);

235 glVertex2f(0, -outbox_height);

236 glEnd();

237

238 // draw the output text

239 glPushMatrix();

240 glTranslatef(0, -dtx_line_height(), 0);

241 glColor4f(1, 1, 1, 0.7);

242 dtx_string(buflines.c_str());

243 glPopMatrix();

244

245 // draw the input line

246 glTranslatef(0, -outbox_height - dtx_line_height(), 0);

247 dtx_string((std::string("> ") + input).c_str());

248

249 glPopAttrib();

250

251 glMatrixMode(GL_PROJECTION);

252 glPopMatrix();

253 glMatrixMode(GL_MODELVIEW);

254 glPopMatrix();

255 }

256

257 void Console::input_key(int key)

258 {

259 keybuf[inpq_back] = key;

260 inpq_back = (inpq_back + 1) % INPUTQ_SIZE;

261 }

262

263 void Console::putchar(char c)

264 {

265 if(output.empty()) {

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

267 }

268

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

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

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

272 output.erase(output.begin());

273 }

274 } else {

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

276 }

277 }

278

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

280 {

281 while(*str) {

282 putchar(*str++);

283 }

284 }

285

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

287 {

288 static char buf[1024];

289 va_list ap;

290

291 va_start(ap, fmt);

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

293 va_end(ap);

294

295 puts(buf);

296 }

297

298 void Console::debug()

299 {

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

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

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

303

304 int qsize = 0;

305 int qidx = inpq_front;

306 while(qidx != inpq_back) {

307 qsize++;

308 qidx = (qidx + 1) % INPUTQ_SIZE;

309 }

310

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

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

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

314 auto it = hist.begin();

315 int idx = 0;

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

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

318 }

319

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

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

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

323 }

324 }