Mercurial > hg > octave-nkf
annotate src/pager.cc @ 15077:f0b04a20d7cf
initialize randn state in splinefit test
* splinefit.m: Initialize randn state to make test reproducible.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 01 Aug 2012 12:10:26 -0400 |
| parents | bf219932bf3e |
| children |
| rev | line source |
|---|---|
| 1 | 1 /* |
| 2 | |
|
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3 Copyright (C) 1993-2012 John W. Eaton |
| 1 | 4 |
| 5 This file is part of Octave. | |
| 6 | |
| 7 Octave is free software; you can redistribute it and/or modify it | |
| 8 under the terms of the GNU General Public License as published by the | |
| 7016 | 9 Free Software Foundation; either version 3 of the License, or (at your |
| 10 option) any later version. | |
| 1 | 11 |
| 12 Octave is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 for more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License | |
| 7016 | 18 along with Octave; see the file COPYING. If not, see |
| 19 <http://www.gnu.org/licenses/>. | |
| 1 | 20 |
| 21 */ | |
| 22 | |
| 240 | 23 #ifdef HAVE_CONFIG_H |
| 1192 | 24 #include <config.h> |
| 1 | 25 #endif |
| 26 | |
| 3503 | 27 #include <fstream> |
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28 #include <iostream> |
| 1755 | 29 #include <string> |
| 1 | 30 |
| 2926 | 31 #include "cmd-edit.h" |
| 32 #include "oct-env.h" | |
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33 #include "singleton-cleanup.h" |
| 2101 | 34 |
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35 #include "defaults.h" |
| 1352 | 36 #include "defun.h" |
| 37 #include "error.h" | |
| 2164 | 38 #include "gripes.h" |
| 2110 | 39 #include "input.h" |
| 1755 | 40 #include "oct-obj.h" |
| 1352 | 41 #include "pager.h" |
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42 #include "procstream.h" |
| 990 | 43 #include "sighandlers.h" |
| 2100 | 44 #include "unwind-prot.h" |
| 2201 | 45 #include "utils.h" |
| 2368 | 46 #include "variables.h" |
| 2093 | 47 |
| 48 // Our actual connection to the external pager. | |
| 49 static oprocstream *external_pager = 0; | |
| 1 | 50 |
| 3018 | 51 // TRUE means we write to the diary file. |
| 52 static bool write_to_diary_file = false; | |
| 581 | 53 |
| 54 // The name of the current diary file. | |
| 3523 | 55 static std::string diary_file; |
| 581 | 56 |
| 57 // The diary file. | |
| 3523 | 58 static std::ofstream external_diary_file; |
| 581 | 59 |
| 5794 | 60 static std::string |
| 61 default_pager (void) | |
| 62 { | |
| 63 std::string pager_binary = octave_env::getenv ("PAGER"); | |
| 64 | |
| 65 #ifdef OCTAVE_DEFAULT_PAGER | |
| 66 if (pager_binary.empty ()) | |
| 6144 | 67 pager_binary = OCTAVE_DEFAULT_PAGER; |
| 5794 | 68 #endif |
| 69 | |
| 70 return pager_binary; | |
| 71 } | |
| 72 | |
| 2164 | 73 // The shell command to run as the pager. |
| 5794 | 74 static std::string VPAGER = default_pager (); |
| 2164 | 75 |
| 6144 | 76 // The options to pass to the pager. |
| 77 static std::string VPAGER_FLAGS; | |
| 78 | |
| 2164 | 79 // TRUE means that if output is going to the pager, it is sent as soon |
| 80 // as it is available. Otherwise, it is buffered and only sent to the | |
| 81 // pager when it is time to print another prompt. | |
| 5794 | 82 static bool Vpage_output_immediately = false; |
| 2164 | 83 |
| 84 // TRUE means all output intended for the screen should be passed | |
| 85 // through the pager. | |
| 5794 | 86 static bool Vpage_screen_output = true; |
| 2164 | 87 |
| 3018 | 88 static bool really_flush_to_pager = false; |
| 2100 | 89 |
| 3018 | 90 static bool flushing_output_to_pager = false; |
| 2206 | 91 |
| 2093 | 92 static void |
| 2197 | 93 clear_external_pager (void) |
| 94 { | |
| 5142 | 95 if (external_pager) |
| 96 { | |
| 97 octave_child_list::remove (external_pager->pid ()); | |
| 2197 | 98 |
| 5142 | 99 delete external_pager; |
| 100 external_pager = 0; | |
| 2197 | 101 } |
| 102 } | |
| 103 | |
| 5142 | 104 static bool |
| 105 pager_event_handler (pid_t pid, int status) | |
| 2209 | 106 { |
| 5142 | 107 bool retval = false; |
| 108 | |
| 2209 | 109 if (pid > 0) |
| 110 { | |
| 111 if (WIFEXITED (status) || WIFSIGNALLED (status)) | |
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112 { |
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113 // Avoid warning() since that will put us back in the pager, |
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114 // which would be bad news. |
| 2209 | 115 |
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116 std::cerr << "warning: connection to external pager lost (pid = " |
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117 << pid << ")" << std::endl; |
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118 std::cerr << "warning: flushing pending output (please wait)" |
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119 << std::endl; |
| 5142 | 120 |
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121 // Request removal of this PID from the list of child |
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122 // processes. |
| 5142 | 123 |
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124 retval = true; |
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125 } |
| 2209 | 126 } |
| 5142 | 127 |
| 128 return retval; | |
| 2209 | 129 } |
| 130 | |
| 6144 | 131 static std::string |
| 132 pager_command (void) | |
| 133 { | |
| 134 std::string cmd = VPAGER; | |
| 135 | |
| 136 if (! (cmd.empty () || VPAGER_FLAGS.empty ())) | |
| 137 cmd += " " + VPAGER_FLAGS; | |
| 138 | |
| 139 return cmd; | |
| 140 } | |
| 141 | |
| 2209 | 142 static void |
| 3233 | 143 do_sync (const char *msg, int len, bool bypass_pager) |
| 1 | 144 { |
| 3233 | 145 if (msg && len > 0) |
| 1 | 146 { |
| 2206 | 147 if (bypass_pager) |
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148 { |
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149 std::cout.write (msg, len); |
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150 std::cout.flush (); |
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151 } |
| 2206 | 152 else |
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153 { |
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154 if (! external_pager) |
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155 { |
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156 std::string pgr = pager_command (); |
| 2093 | 157 |
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158 if (! pgr.empty ()) |
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159 { |
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160 external_pager = new oprocstream (pgr.c_str ()); |
| 2093 | 161 |
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162 if (external_pager) |
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163 octave_child_list::insert (external_pager->pid (), |
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164 pager_event_handler); |
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165 } |
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166 } |
| 2101 | 167 |
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168 if (external_pager) |
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169 { |
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170 if (external_pager->good ()) |
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171 { |
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172 external_pager->write (msg, len); |
| 2101 | 173 |
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174 external_pager->flush (); |
| 2197 | 175 |
| 5142 | 176 #if defined (EPIPE) |
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177 if (errno == EPIPE) |
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178 external_pager->setstate (std::ios::failbit); |
| 5142 | 179 #endif |
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180 } |
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181 else |
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182 { |
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183 // FIXME -- omething is not right with the |
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184 // pager. If it died then we should receive a |
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185 // signal for that. If there is some other problem, |
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186 // then what? |
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187 } |
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188 } |
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189 else |
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190 { |
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191 std::cout.write (msg, len); |
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192 std::cout.flush (); |
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193 } |
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194 } |
| 1 | 195 } |
| 196 } | |
| 197 | |
| 3233 | 198 // Assume our terminal wraps long lines. |
| 199 | |
| 2101 | 200 static bool |
| 3233 | 201 more_than_a_screenful (const char *s, int len) |
| 2101 | 202 { |
| 203 if (s) | |
| 204 { | |
| 2926 | 205 int available_rows = command_editor::terminal_rows () - 2; |
| 2101 | 206 |
| 3233 | 207 int cols = command_editor::terminal_cols (); |
| 208 | |
| 2103 | 209 int count = 0; |
| 210 | |
| 3233 | 211 int chars_this_line = 0; |
| 2101 | 212 |
| 3233 | 213 for (int i = 0; i < len; i++) |
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214 { |
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215 if (*s++ == '\n') |
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216 { |
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217 count += chars_this_line / cols + 1; |
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218 chars_this_line = 0; |
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219 } |
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220 else |
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221 chars_this_line++; |
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222 } |
| 2101 | 223 |
| 3233 | 224 if (count > available_rows) |
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225 return true; |
| 2101 | 226 } |
| 227 | |
| 228 return false; | |
| 229 } | |
| 230 | |
| 2093 | 231 int |
| 232 octave_pager_buf::sync (void) | |
| 233 { | |
| 2186 | 234 if (! interactive |
| 235 || really_flush_to_pager | |
| 2164 | 236 || (Vpage_screen_output && Vpage_output_immediately) |
| 237 || ! Vpage_screen_output) | |
| 2100 | 238 { |
| 3233 | 239 char *buf = eback (); |
| 2093 | 240 |
| 3233 | 241 int len = pptr () - buf; |
| 2100 | 242 |
| 2110 | 243 bool bypass_pager = (! interactive |
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244 || ! Vpage_screen_output |
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245 || (really_flush_to_pager |
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246 && Vpage_screen_output |
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247 && ! Vpage_output_immediately |
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248 && ! more_than_a_screenful (buf, len))); |
| 2475 | 249 |
| 3233 | 250 if (len > 0) |
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251 { |
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252 do_sync (buf, len, bypass_pager); |
| 2093 | 253 |
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254 flush_current_contents_to_diary (); |
| 3233 | 255 |
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256 seekoff (0, std::ios::beg); |
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257 } |
| 2100 | 258 } |
| 2093 | 259 |
| 260 return 0; | |
| 261 } | |
| 262 | |
| 3477 | 263 void |
| 264 octave_pager_buf::flush_current_contents_to_diary (void) | |
| 265 { | |
| 3756 | 266 char *buf = eback () + diary_skip; |
| 3477 | 267 |
| 3756 | 268 size_t len = pptr () - buf; |
| 3477 | 269 |
| 270 octave_diary.write (buf, len); | |
| 3756 | 271 |
| 3870 | 272 diary_skip = 0; |
| 3756 | 273 } |
| 274 | |
| 275 void | |
| 276 octave_pager_buf::set_diary_skip (void) | |
| 277 { | |
| 278 diary_skip = pptr () - eback (); | |
| 3477 | 279 } |
| 280 | |
| 2093 | 281 int |
| 282 octave_diary_buf::sync (void) | |
| 283 { | |
| 3233 | 284 if (write_to_diary_file && external_diary_file) |
| 285 { | |
| 3870 | 286 char *buf = eback (); |
| 287 | |
| 288 int len = pptr () - buf; | |
| 2093 | 289 |
| 3233 | 290 if (len > 0) |
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291 external_diary_file.write (buf, len); |
| 3233 | 292 } |
| 2093 | 293 |
| 3544 | 294 seekoff (0, std::ios::beg); |
| 2093 | 295 |
| 296 return 0; | |
| 297 } | |
| 298 | |
| 299 octave_pager_stream *octave_pager_stream::instance = 0; | |
| 300 | |
| 3775 | 301 octave_pager_stream::octave_pager_stream (void) : std::ostream (0), pb (0) |
| 1 | 302 { |
| 4051 | 303 pb = new octave_pager_buf (); |
| 2093 | 304 rdbuf (pb); |
| 305 setf (unitbuf); | |
| 306 } | |
| 307 | |
| 308 octave_pager_stream::~octave_pager_stream (void) | |
| 309 { | |
| 310 flush (); | |
| 311 delete pb; | |
| 312 } | |
| 313 | |
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314 std::ostream& |
| 2093 | 315 octave_pager_stream::stream (void) |
| 316 { | |
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317 return instance_ok () ? *instance : std::cout; |
| 2093 | 318 } |
| 319 | |
| 3477 | 320 void |
| 321 octave_pager_stream::flush_current_contents_to_diary (void) | |
| 322 { | |
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323 if (instance_ok ()) |
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324 instance->do_flush_current_contents_to_diary (); |
| 3477 | 325 } |
| 326 | |
| 3756 | 327 void |
| 328 octave_pager_stream::set_diary_skip (void) | |
| 329 { | |
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330 if (instance_ok ()) |
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331 instance->do_set_diary_skip (); |
| 3756 | 332 } |
| 333 | |
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334 // Reinitialize the pager buffer to avoid hanging on to large internal |
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335 // buffers when they might not be needed. This function should only be |
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336 // called when the pager is not in use. For example, just before |
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337 // getting command-line input. |
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338 |
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339 void |
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340 octave_pager_stream::reset (void) |
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341 { |
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342 if (instance_ok ()) |
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343 instance->do_reset (); |
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344 } |
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345 |
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346 void |
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347 octave_pager_stream::do_flush_current_contents_to_diary (void) |
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348 { |
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349 if (pb) |
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350 pb->flush_current_contents_to_diary (); |
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351 } |
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352 |
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353 void |
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354 octave_pager_stream::do_set_diary_skip (void) |
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355 { |
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356 if (pb) |
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357 pb->set_diary_skip (); |
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358 } |
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359 |
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360 void |
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361 octave_pager_stream::do_reset (void) |
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362 { |
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363 delete pb; |
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364 pb = new octave_pager_buf (); |
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365 rdbuf (pb); |
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366 setf (unitbuf); |
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367 } |
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368 |
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369 bool |
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370 octave_pager_stream::instance_ok (void) |
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371 { |
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372 bool retval = true; |
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373 |
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374 if (! instance) |
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375 { |
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376 instance = new octave_pager_stream (); |
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377 |
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378 if (instance) |
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379 singleton_cleanup_list::add (cleanup_instance); |
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380 } |
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381 |
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382 if (! instance) |
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383 { |
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384 ::error ("unable to create pager_stream object!"); |
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385 |
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386 retval = false; |
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387 } |
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388 |
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389 return retval; |
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390 } |
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391 |
| 2093 | 392 octave_diary_stream *octave_diary_stream::instance = 0; |
| 393 | |
| 3775 | 394 octave_diary_stream::octave_diary_stream (void) : std::ostream (0), db (0) |
| 2093 | 395 { |
| 4051 | 396 db = new octave_diary_buf (); |
| 2093 | 397 rdbuf (db); |
| 398 setf (unitbuf); | |
| 399 } | |
| 400 | |
| 401 octave_diary_stream::~octave_diary_stream (void) | |
| 402 { | |
| 403 flush (); | |
| 404 delete db; | |
| 405 } | |
| 406 | |
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407 std::ostream& |
| 2093 | 408 octave_diary_stream::stream (void) |
| 409 { | |
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410 return instance_ok () ? *instance : std::cout; |
| 1 | 411 } |
| 412 | |
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413 // Reinitialize the diary buffer to avoid hanging on to large internal |
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414 // buffers when they might not be needed. This function should only be |
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415 // called when the pager is not in use. For example, just before |
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416 // getting command-line input. |
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417 |
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418 void |
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419 octave_diary_stream::reset (void) |
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420 { |
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421 if (instance_ok ()) |
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422 instance->do_reset (); |
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423 } |
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424 |
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425 void |
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426 octave_diary_stream::do_reset (void) |
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427 { |
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428 delete db; |
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429 db = new octave_diary_buf (); |
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430 rdbuf (db); |
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431 setf (unitbuf); |
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432 } |
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433 |
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434 bool |
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435 octave_diary_stream::instance_ok (void) |
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436 { |
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437 bool retval = true; |
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438 |
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439 if (! instance) |
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440 { |
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441 instance = new octave_diary_stream (); |
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442 |
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443 if (instance) |
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444 singleton_cleanup_list::add (cleanup_instance); |
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445 } |
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446 |
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447 if (! instance) |
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448 { |
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449 ::error ("unable to create diary_stream object!"); |
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450 |
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451 retval = false; |
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452 } |
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453 |
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454 return retval; |
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455 } |
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456 |
| 1 | 457 void |
| 2093 | 458 flush_octave_stdout (void) |
| 1 | 459 { |
| 2206 | 460 if (! flushing_output_to_pager) |
| 461 { | |
|
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462 unwind_protect frame; |
| 2100 | 463 |
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464 frame.protect_var (really_flush_to_pager); |
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465 frame.protect_var (flushing_output_to_pager); |
| 2100 | 466 |
| 3018 | 467 really_flush_to_pager = true; |
| 468 flushing_output_to_pager = true; | |
| 2206 | 469 |
| 470 octave_stdout.flush (); | |
| 1 | 471 |
| 5142 | 472 clear_external_pager (); |
| 2206 | 473 } |
| 1 | 474 } |
| 475 | |
| 1965 | 476 static void |
| 2093 | 477 close_diary_file (void) |
| 1 | 478 { |
| 3477 | 479 // Try to flush the current buffer to the diary now, so that things |
| 480 // like | |
| 481 // | |
| 482 // function foo () | |
| 483 // diary on; | |
| 484 // ... | |
| 485 // diary off; | |
| 486 // endfunction | |
| 487 // | |
| 488 // will do the right thing. | |
| 489 | |
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490 octave_pager_stream::flush_current_contents_to_diary (); |
| 3477 | 491 |
| 2093 | 492 if (external_diary_file.is_open ()) |
| 1 | 493 { |
| 2093 | 494 octave_diary.flush (); |
| 495 external_diary_file.close (); | |
| 1 | 496 } |
| 497 } | |
| 498 | |
| 581 | 499 static void |
| 500 open_diary_file (void) | |
| 501 { | |
| 2093 | 502 close_diary_file (); |
| 581 | 503 |
| 3756 | 504 // If there is pending output in the pager buf, it should not go |
| 505 // into the diary file. | |
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506 |
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507 octave_pager_stream::set_diary_skip (); |
| 3756 | 508 |
| 3544 | 509 external_diary_file.open (diary_file.c_str (), std::ios::app); |
| 581 | 510 |
| 2093 | 511 if (! external_diary_file) |
| 512 error ("diary: can't open diary file `%s'", diary_file.c_str ()); | |
| 581 | 513 } |
| 514 | |
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515 DEFUN (diary, args, , |
| 3332 | 516 "-*- texinfo -*-\n\ |
| 11547 | 517 @deftypefn {Command} {} diary options\n\ |
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518 Record a list of all commands @emph{and} the output they produce, mixed\n\ |
| 3332 | 519 together just as you see them on your terminal. Valid options are:\n\ |
| 520 \n\ | |
| 521 @table @code\n\ | |
| 522 @item on\n\ | |
| 523 Start recording your session in a file called @file{diary} in your\n\ | |
| 524 current working directory.\n\ | |
| 581 | 525 \n\ |
| 3332 | 526 @item off\n\ |
| 527 Stop recording your session in the diary file.\n\ | |
| 528 \n\ | |
| 529 @item @var{file}\n\ | |
| 530 Record your session in the file named @var{file}.\n\ | |
| 531 @end table\n\ | |
| 532 \n\ | |
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533 With no arguments, @code{diary} toggles the current diary state.\n\ |
| 11547 | 534 @end deftypefn") |
| 581 | 535 { |
| 2086 | 536 octave_value_list retval; |
| 581 | 537 |
| 1755 | 538 int argc = args.length () + 1; |
| 539 | |
| 1965 | 540 string_vector argv = args.make_argv ("diary"); |
| 581 | 541 |
| 1755 | 542 if (error_state) |
| 543 return retval; | |
| 544 | |
| 545 if (diary_file.empty ()) | |
| 546 diary_file = "diary"; | |
| 1306 | 547 |
| 581 | 548 switch (argc) |
| 549 { | |
| 550 case 1: | |
| 551 write_to_diary_file = ! write_to_diary_file; | |
| 552 open_diary_file (); | |
| 553 break; | |
| 623 | 554 |
| 581 | 555 case 2: |
| 556 { | |
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557 std::string arg = argv[1]; |
| 1755 | 558 |
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559 if (arg == "on") |
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560 { |
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561 write_to_diary_file = true; |
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562 open_diary_file (); |
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563 } |
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564 else if (arg == "off") |
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565 { |
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566 close_diary_file (); |
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567 write_to_diary_file = false; |
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568 } |
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569 else |
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570 { |
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571 diary_file = arg; |
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572 write_to_diary_file = true; |
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573 open_diary_file (); |
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574 } |
| 581 | 575 } |
| 576 break; | |
| 777 | 577 |
| 581 | 578 default: |
| 5823 | 579 print_usage (); |
| 581 | 580 break; |
| 581 } | |
| 582 | |
| 583 return retval; | |
| 584 } | |
| 585 | |
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586 DEFUN (more, args, , |
| 3372 | 587 "-*- texinfo -*-\n\ |
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588 @deftypefn {Command} {} more\n\ |
| 11547 | 589 @deftypefnx {Command} {} more on\n\ |
| 590 @deftypefnx {Command} {} more off\n\ | |
| 3372 | 591 Turn output pagination on or off. Without an argument, @code{more}\n\ |
| 592 toggles the current state.\n\ | |
| 7432 | 593 The current state can be determined via @code{page_screen_output}.\n\ |
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594 @seealso{page_screen_output, page_output_immediately, PAGER, PAGER_FLAGS}\n\ |
| 11547 | 595 @end deftypefn") |
| 1409 | 596 { |
| 2086 | 597 octave_value_list retval; |
| 1409 | 598 |
| 1755 | 599 int argc = args.length () + 1; |
| 600 | |
| 1965 | 601 string_vector argv = args.make_argv ("more"); |
| 1755 | 602 |
| 603 if (error_state) | |
| 604 return retval; | |
| 1409 | 605 |
| 606 if (argc == 2) | |
| 607 { | |
| 3523 | 608 std::string arg = argv[1]; |
| 1409 | 609 |
| 1755 | 610 if (arg == "on") |
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611 Vpage_screen_output = true; |
| 1755 | 612 else if (arg == "off") |
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613 Vpage_screen_output = false; |
| 1409 | 614 else |
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615 error ("more: unrecognized argument `%s'", arg.c_str ()); |
| 1409 | 616 } |
| 4324 | 617 else if (argc == 1) |
| 5794 | 618 Vpage_screen_output = ! Vpage_screen_output; |
| 1409 | 619 else |
| 5823 | 620 print_usage (); |
| 1409 | 621 |
| 622 return retval; | |
| 623 } | |
| 624 | |
| 5673 | 625 DEFUN (terminal_size, , , |
| 626 "-*- texinfo -*-\n\ | |
| 627 @deftypefn {Built-in Function} {} terminal_size ()\n\ | |
| 628 Return a two-element row vector containing the current size of the\n\ | |
| 629 terminal window in characters (rows and columns).\n\ | |
| 5778 | 630 @seealso{list_in_columns}\n\ |
| 5673 | 631 @end deftypefn") |
| 632 { | |
| 633 RowVector size (2, 0.0); | |
| 634 | |
| 635 size(0) = command_editor::terminal_rows (); | |
| 636 size(1) = command_editor::terminal_cols (); | |
| 637 | |
| 638 return octave_value (size); | |
| 639 } | |
| 640 | |
| 5794 | 641 DEFUN (page_output_immediately, args, nargout, |
| 642 "-*- texinfo -*-\n\ | |
| 10840 | 643 @deftypefn {Built-in Function} {@var{val} =} page_output_immediately ()\n\ |
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644 @deftypefnx {Built-in Function} {@var{old_val} =} page_output_immediately (@var{new_val})\n\ |
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645 @deftypefnx {Built-in Function} {} page_output_immediately (@var{new_val}, \"local\")\n\ |
| 5794 | 646 Query or set the internal variable that controls whether Octave sends\n\ |
| 647 output to the pager as soon as it is available. Otherwise, Octave\n\ | |
| 648 buffers its output and waits until just before the prompt is printed to\n\ | |
| 649 flush it to the pager.\n\ | |
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650 \n\ |
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651 When called from inside a function with the \"local\" option, the variable is\n\ |
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652 changed locally for the function and any subroutines it calls. The original\n\ |
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653 variable value is restored when exiting the function.\n\ |
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654 @seealso{page_screen_output, more, PAGER, PAGER_FLAGS}\n\ |
| 5794 | 655 @end deftypefn") |
| 2097 | 656 { |
| 5794 | 657 return SET_INTERNAL_VARIABLE (page_output_immediately); |
| 2164 | 658 } |
| 659 | |
| 5794 | 660 DEFUN (page_screen_output, args, nargout, |
| 661 "-*- texinfo -*-\n\ | |
| 10840 | 662 @deftypefn {Built-in Function} {@var{val} =} page_screen_output ()\n\ |
| 5794 | 663 @deftypefnx {Built-in Function} {@var{old_val} =} page_screen_output (@var{new_val})\n\ |
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664 @deftypefnx {Built-in Function} {} page_screen_output (@var{new_val}, \"local\")\n\ |
| 5794 | 665 Query or set the internal variable that controls whether output intended\n\ |
| 666 for the terminal window that is longer than one page is sent through a\n\ | |
| 667 pager. This allows you to view one screenful at a time. Some pagers\n\ | |
| 668 (such as @code{less}---see @ref{Installation}) are also capable of moving\n\ | |
| 669 backward on the output.\n\ | |
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670 \n\ |
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671 When called from inside a function with the \"local\" option, the variable is\n\ |
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672 changed locally for the function and any subroutines it calls. The original\n\ |
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673 variable value is restored when exiting the function.\n\ |
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674 @seealso{more, page_output_immediately, PAGER, PAGER_FLAGS}\n\ |
| 5794 | 675 @end deftypefn") |
| 2164 | 676 { |
| 5794 | 677 return SET_INTERNAL_VARIABLE (page_screen_output); |
| 2164 | 678 } |
| 679 | |
| 5794 | 680 DEFUN (PAGER, args, nargout, |
| 681 "-*- texinfo -*-\n\ | |
| 10840 | 682 @deftypefn {Built-in Function} {@var{val} =} PAGER ()\n\ |
| 5794 | 683 @deftypefnx {Built-in Function} {@var{old_val} =} PAGER (@var{new_val})\n\ |
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684 @deftypefnx {Built-in Function} {} PAGER (@var{new_val}, \"local\")\n\ |
| 5794 | 685 Query or set the internal variable that specifies the program to use\n\ |
| 686 to display terminal output on your system. The default value is\n\ | |
| 687 normally @code{\"less\"}, @code{\"more\"}, or\n\ | |
| 3372 | 688 @code{\"pg\"}, depending on what programs are installed on your system.\n\ |
| 689 @xref{Installation}.\n\ | |
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690 \n\ |
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691 When called from inside a function with the \"local\" option, the variable is\n\ |
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692 changed locally for the function and any subroutines it calls. The original\n\ |
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693 variable value is restored when exiting the function.\n\ |
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694 @seealso{PAGER_FLAGS, page_output_immediately, more, page_screen_output}\n\ |
| 5794 | 695 @end deftypefn") |
| 696 { | |
| 697 return SET_NONEMPTY_INTERNAL_STRING_VARIABLE (PAGER); | |
| 2097 | 698 } |
| 699 | |
| 6144 | 700 DEFUN (PAGER_FLAGS, args, nargout, |
| 701 "-*- texinfo -*-\n\ | |
| 10840 | 702 @deftypefn {Built-in Function} {@var{val} =} PAGER_FLAGS ()\n\ |
| 6144 | 703 @deftypefnx {Built-in Function} {@var{old_val} =} PAGER_FLAGS (@var{new_val})\n\ |
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704 @deftypefnx {Built-in Function} {} PAGER_FLAGS (@var{new_val}, \"local\")\n\ |
| 6144 | 705 Query or set the internal variable that specifies the options to pass\n\ |
| 706 to the pager.\n\ | |
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707 \n\ |
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708 When called from inside a function with the \"local\" option, the variable is\n\ |
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709 changed locally for the function and any subroutines it calls. The original\n\ |
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710 variable value is restored when exiting the function.\n\ |
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711 @seealso{PAGER, more, page_screen_output, page_output_immediately}\n\ |
| 6144 | 712 @end deftypefn") |
| 713 { | |
| 714 return SET_NONEMPTY_INTERNAL_STRING_VARIABLE (PAGER_FLAGS); | |
| 715 } |