1/* Part of SWI-Prolog 2 3 Author: Jan Wielemaker 4 E-mail: J.Wielemaker@vu.nl 5 WWW: http://www.swi-prolog.org 6 Copyright (c) 2010-2021, VU University Amsterdam 7 CWI, Amsterdam 8 SWI-Prolog Solutions b.v. 9 All rights reserved. 10 11 Redistribution and use in source and binary forms, with or without 12 modification, are permitted provided that the following conditions 13 are met: 14 15 1. Redistributions of source code must retain the above copyright 16 notice, this list of conditions and the following disclaimer. 17 18 2. Redistributions in binary form must reproduce the above copyright 19 notice, this list of conditions and the following disclaimer in 20 the documentation and/or other materials provided with the 21 distribution. 22 23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 25 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 26 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 27 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 28 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 29 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 30 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 31 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 33 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 POSSIBILITY OF SUCH DAMAGE. 35*/ 36 37:- module(ansi_term, 38 [ ansi_format/3, % +Attr, +Format, +Args 39 ansi_get_color/2, % +Which, -rgb(R,G,B) 40 ansi_hyperlink/2, % +Stream,+Location 41 ansi_hyperlink/3 % +Stream,+URL,+Label 42 ]). 43:- autoload(library(error), [domain_error/2, must_be/2, instantiation_error/1]). 44:- autoload(library(lists), [append/3]). 45:- autoload(library(uri), [uri_file_name/2]). 46:- if(exists_source(library(time))). 47:- autoload(library(time), [call_with_time_limit/2]). 48:- endif.
74:- multifile 75 prolog:console_color/2, % +Term, -AnsiAttrs 76 supports_get_color/0, 77 hyperlink/2. % +Stream, +Spec 78 79 80color_term_flag_default(true) :- 81 stream_property(user_input, tty(true)), 82 stream_property(user_error, tty(true)), 83 stream_property(user_output, tty(true)), 84 \+ getenv('TERM', dumb), 85 !. 86color_term_flag_default(false). 87 88init_color_term_flag :- 89 color_term_flag_default(Default), 90 create_prolog_flag(color_term, Default, 91 [ type(boolean), 92 keep(true) 93 ]), 94 create_prolog_flag(hyperlink_term, false, 95 [ type(boolean), 96 keep(true) 97 ]). 98 99:- init_color_term_flag. 100 101 102:- meta_predicate 103 keep_line_pos(, ). 104 105:- multifile 106 user:message_property/2.
current_output is a
terminal, it adds ANSI escape sequences according to Attributes.
For example, to print a text in bold cyan, do
?- ansi_format([bold,fg(cyan)], 'Hello ~w', [world]).
Attributes is either a single attribute, a list thereof or a term that is mapped to concrete attributes based on the current theme (see prolog:console_color/2). The attribute names are derived from the ANSI specification. See the source for sgr_code/2 for details. Some commonly used attributes are:
fg(Color) and bg(Color), the colour name can be '#RGB' or
'#RRGGBB'h(Color)
or an integer 0..255.
Defined color constants are below. default can be used to
access the default color of the terminal.
ANSI sequences are sent if and only if
current_output has the property tty(true) (see
stream_property/2).color_term is true.148ansi_format(Attr, Format, Args) :- 149 ansi_format(current_output, Attr, Format, Args). 150 151ansi_format(Stream, Class, Format, Args) :- 152 stream_property(Stream, tty(true)), 153 current_prolog_flag(color_term, true), 154 !, 155 class_attrs(Class, Attr), 156 phrase(sgr_codes_ex(Attr), Codes), 157 atomic_list_concat(Codes, ;, Code), 158 with_output_to( 159 Stream, 160 ( keep_line_pos(current_output, format('\e[~wm', [Code])), 161 format(Format, Args), 162 keep_line_pos(current_output, format('\e[0m')) 163 ) 164 ), 165 flush_output. 166ansi_format(Stream, _Attr, Format, Args) :- 167 format(Stream, Format, Args). 168 169sgr_codes_ex(X) --> 170 { var(X), 171 !, 172 instantiation_error(X) 173 }. 174sgr_codes_ex([]) --> 175 !. 176sgr_codes_ex([H|T]) --> 177 !, 178 sgr_codes_ex(H), 179 sgr_codes_ex(T). 180sgr_codes_ex(Attr) --> 181 ( { sgr_code(Attr, Code) } 182 -> ( { is_list(Code) } 183 -> list(Code) 184 ; [Code] 185 ) 186 ; { domain_error(sgr_code, Attr) } 187 ). 188 189list([]) --> []. 190list([H|T]) --> [H], list(T).
| reset | all attributes off |
| bold | |
| faint | |
| italic | |
| underline | |
blink(slow) | |
blink(rapid) | |
| negative | |
| conceal | |
| crossed_out | |
font(primary) | |
font(N) | Alternate font (1..8) |
| fraktur | |
underline(double) | |
intensity(normal) | |
fg(Name) | Color name |
bg(Name) | Color name |
| framed | |
| encircled | |
| overlined | |
ideogram(underline) | |
| right_side_line | |
ideogram(underline(double)) | |
right_side_line(double) | |
ideogram(overlined) | |
| left_side_line | |
ideogram(stress_marking) | |
| -Off | Switch attributes off |
hfg(Name) | Color name |
hbg(Name) | Color name |
232sgr_code(reset, 0). 233sgr_code(bold, 1). 234sgr_code(faint, 2). 235sgr_code(italic, 3). 236sgr_code(underline, 4). 237sgr_code(blink(slow), 5). 238sgr_code(blink(rapid), 6). 239sgr_code(negative, 7). 240sgr_code(conceal, 8). 241sgr_code(crossed_out, 9). 242sgr_code(font(primary), 10) :- !. 243sgr_code(font(N), C) :- 244 C is 10+N. 245sgr_code(fraktur, 20). 246sgr_code(underline(double), 21). 247sgr_code(intensity(normal), 22). 248sgr_code(fg(Name), C) :- 249 ( ansi_color(Name, N) 250 -> C is N+30 251 ; rgb(Name, R, G, B) 252 -> sgr_code(fg(R,G,B), C) 253 ). 254sgr_code(bg(Name), C) :- 255 !, 256 ( ansi_color(Name, N) 257 -> C is N+40 258 ; rgb(Name, R, G, B) 259 -> sgr_code(bg(R,G,B), C) 260 ). 261sgr_code(framed, 51). 262sgr_code(encircled, 52). 263sgr_code(overlined, 53). 264sgr_code(ideogram(underline), 60). 265sgr_code(right_side_line, 60). 266sgr_code(ideogram(underline(double)), 61). 267sgr_code(right_side_line(double), 61). 268sgr_code(ideogram(overlined), 62). 269sgr_code(left_side_line, 62). 270sgr_code(ideogram(stress_marking), 64). 271sgr_code(-X, Code) :- 272 off_code(X, Code). 273sgr_code(hfg(Name), C) :- 274 ansi_color(Name, N), 275 C is N+90. 276sgr_code(hbg(Name), C) :- 277 !, 278 ansi_color(Name, N), 279 C is N+100. 280sgr_code(fg8(Name), [38,5,N]) :- 281 ansi_color8(Name, N). 282sgr_code(bg8(Name), [48,5,N]) :- 283 ansi_color8(Name, N). 284sgr_code(fg(R,G,B), [38,2,R,G,B]) :- 285 between(0, 255, R), 286 between(0, 255, G), 287 between(0, 255, B). 288sgr_code(bg(R,G,B), [48,2,R,G,B]) :- 289 between(0, 255, R), 290 between(0, 255, G), 291 between(0, 255, B). 292 293off_code(italic_and_franktur, 23). 294off_code(underline, 24). 295off_code(blink, 25). 296off_code(negative, 27). 297off_code(conceal, 28). 298off_code(crossed_out, 29). 299off_code(framed, 54). 300off_code(overlined, 55). 301 302ansi_color8(h(Name), N) :- 303 !, 304 ansi_color(Name, N0), 305 N is N0+8. 306ansi_color8(Name, N) :- 307 atom(Name), 308 !, 309 ansi_color(Name, N). 310ansi_color8(N, N) :- 311 between(0, 255, N). 312 313ansi_color(black, 0). 314ansi_color(red, 1). 315ansi_color(green, 2). 316ansi_color(yellow, 3). 317ansi_color(blue, 4). 318ansi_color(magenta, 5). 319ansi_color(cyan, 6). 320ansi_color(white, 7). 321ansi_color(default, 9). 322 323rgb(Name, R, G, B) :- 324 atom_codes(Name, [0'#,R1,R2,G1,G2,B1,B2]), 325 hex_color(R1,R2,R), 326 hex_color(G1,G2,G), 327 hex_color(B1,B2,B). 328rgb(Name, R, G, B) :- 329 atom_codes(Name, [0'#,R1,G1,B1]), 330 hex_color(R1,R), 331 hex_color(G1,G), 332 hex_color(B1,B). 333 334hex_color(D1,D2,V) :- 335 code_type(D1, xdigit(V1)), 336 code_type(D2, xdigit(V2)), 337 V is 16*V1+V2. 338 339hex_color(D1,V) :- 340 code_type(D1, xdigit(V1)), 341 V is 16*V1+V1.
boot/messages.pl.
354 /******************************* 355 * HOOK * 356 *******************************/
ansi(+Attr, +Fmt, +Args) in
message specifications.363prolog:message_line_element(S, ansi(Class, Fmt, Args)) :- 364 class_attrs(Class, Attr), 365 ansi_format(S, Attr, Fmt, Args). 366prolog:message_line_element(S, ansi(Class, Fmt, Args, Ctx)) :- 367 class_attrs(Class, Attr), 368 ansi_format(S, Attr, Fmt, Args), 369 ( nonvar(Ctx), 370 Ctx = ansi(_, RI-RA) 371 -> keep_line_pos(S, format(S, RI, RA)) 372 ; true 373 ). 374prolog:message_line_element(S, url(Location)) :- 375 ansi_hyperlink(S, Location). 376prolog:message_line_element(S, url(URL, Label)) :- 377 ansi_hyperlink(S, URL, Label). 378prolog:message_line_element(S, begin(Level, Ctx)) :- 379 level_attrs(Level, Attr), 380 stream_property(S, tty(true)), 381 current_prolog_flag(color_term, true), 382 !, 383 ( is_list(Attr) 384 -> sgr_codes(Attr, Codes), 385 atomic_list_concat(Codes, ;, Code) 386 ; sgr_code(Attr, Code) 387 ), 388 keep_line_pos(S, format(S, '\e[~wm', [Code])), 389 Ctx = ansi('\e[0m', '\e[0m\e[~wm'-[Code]). 390prolog:message_line_element(S, end(Ctx)) :- 391 nonvar(Ctx), 392 Ctx = ansi(Reset, _), 393 keep_line_pos(S, write(S, Reset)). 394 395sgr_codes([], []). 396sgr_codes([H0|T0], [H|T]) :- 397 sgr_code(H0, H), 398 sgr_codes(T0, T). 399 400level_attrs(Level, Attrs) :- 401 user:message_property(Level, color(Attrs)), 402 !. 403level_attrs(Level, Attrs) :- 404 class_attrs(message(Level), Attrs). 405 406class_attrs(Class, Attrs) :- 407 user:message_property(Class, color(Attrs)), 408 !. 409class_attrs(Class, Attrs) :- 410 prolog:console_color(Class, Attrs), 411 !. 412class_attrs(Class, Attrs) :- 413 '$messages':default_theme(Class, Attrs), 414 !. 415class_attrs(Attrs, Attrs).
L before the line.
``file://AbsFileName[#LLine[:Column]]``
429ansi_hyperlink(Stream, Location) :- 430 hyperlink(Stream, url(Location)), 431 !. 432ansi_hyperlink(Stream, File:Line:Column) :- 433 !, 434 ( url_file_name(URI, File) 435 -> format(Stream, '\e]8;;~w#~d:~d\e\\~w:~d:~d\e]8;;\e\\', 436 [ URI, Line, Column, File, Line, Column ]) 437 ; format(Stream, '~w:~w:~w', [File, Line, Column]) 438 ). 439ansi_hyperlink(Stream, File:Line) :- 440 !, 441 ( url_file_name(URI, File) 442 -> format(Stream, '\e]8;;~w#~w\e\\~w:~d\e]8;;\e\\', 443 [ URI, Line, File, Line ]) 444 ; format(Stream, '~w:~w', [File, Line]) 445 ). 446ansi_hyperlink(Stream, File) :- 447 ( url_file_name(URI, File) 448 -> format(Stream, '\e]8;;~w\e\\~w\e]8;;\e\\', 449 [ URI, File ]) 450 ; format(Stream, '~w', [File]) 451 ). 452 453ansi_hyperlink(Stream, URL, Label) :- 454 hyperlink(Stream, url(URL, Label)), 455 !. 456ansi_hyperlink(Stream, URL, Label) :- 457 ( current_prolog_flag(hyperlink_term, true) 458 -> format(Stream, '\e]8;;~w\e\\~w\e]8;;\e\\', 459 [ URL, Label ]) 460 ; format(Stream, '~w', [Label]) 461 ).
472:- dynamic has_lib_uri/1 as volatile. 473 474url_file_name(URL, File) :- 475 current_prolog_flag(hyperlink_term, true), 476 ( has_lib_uri(true) 477 -> uri_file_name(URL, File) 478 ; exists_source(library(uri)) 479 -> use_module(library(uri), [uri_file_name/2]), 480 uri_file_name(URL, File), 481 asserta(has_lib_uri(true)) 482 ; asserta(has_lib_uri(false)), 483 fail 484 ).
line_pos notion.492keep_line_pos(S, G) :- 493 stream_property(S, position(Pos)), 494 !, 495 setup_call_cleanup( 496 stream_position_data(line_position, Pos, LPos), 497 G, 498 set_stream(S, line_position(LPos))). 499keep_line_pos(_, G) :- 500 call(G).
foreground and background. This predicate sends a request to the
console (user_output) and reads the reply. This assumes an xterm
compatible terminal.
514:- if(current_predicate(call_with_time_limit/2)). 515ansi_get_color(Which0, RGB) :- 516 stream_property(user_input, tty(true)), 517 stream_property(user_output, tty(true)), 518 stream_property(user_error, tty(true)), 519 supports_get_color, 520 ( color_alias(Which0, Which) 521 -> true 522 ; must_be(between(0,15),Which0) 523 -> Which = Which0 524 ), 525 catch(keep_line_pos(user_output, 526 ansi_get_color_(Which, RGB)), 527 time_limit_exceeded, 528 no_xterm). 529 530supports_get_color :- 531 getenv('TERM', Term), 532 sub_atom(Term, 0, _, _, xterm), 533 \+ getenv('TERM_PROGRAM', 'Apple_Terminal'). 534 535color_alias(foreground, 10). 536color_alias(background, 11). 537 538ansi_get_color_(Which, rgb(R,G,B)) :- 539 format(codes(Id), '~w', [Which]), 540 hex4(RH), 541 hex4(GH), 542 hex4(BH), 543 phrase(("\e]", , ";rgb:", , "/", , "/", , "\a"), Pattern), 544 call_with_time_limit(0.05, 545 with_tty_raw(exchange_pattern(Which, Pattern))), 546 !, 547 hex_val(RH, R), 548 hex_val(GH, G), 549 hex_val(BH, B). 550 551no_xterm :- 552 print_message(warning, ansi(no_xterm_get_colour)), 553 fail. 554 555hex4([_,_,_,_]). 556 557hex_val([D1,D2,D3,D4], V) :- 558 code_type(D1, xdigit(V1)), 559 code_type(D2, xdigit(V2)), 560 code_type(D3, xdigit(V3)), 561 code_type(D4, xdigit(V4)), 562 V is (V1<<12)+(V2<<8)+(V3<<4)+V4. 563 564exchange_pattern(Which, Pattern) :- 565 format(user_output, '\e]~w;?\a', [Which]), 566 flush_output(user_output), 567 read_pattern(user_input, Pattern, []). 568 569read_pattern(From, Pattern, NotMatched0) :- 570 copy_term(Pattern, TryPattern), 571 append(Skip, Rest, NotMatched0), 572 append(Rest, RestPattern, TryPattern), 573 !, 574 echo(Skip), 575 try_read_pattern(From, RestPattern, NotMatched, Done), 576 ( Done == true 577 -> Pattern = TryPattern 578 ; read_pattern(From, Pattern, NotMatched) 579 ).
583try_read_pattern(_, [], [], true) :- 584 !. 585try_read_pattern(From, [H|T], [C|RT], Done) :- 586 get_code(C), 587 ( C = H 588 -> try_read_pattern(From, T, RT, Done) 589 ; RT = [], 590 Done = false 591 ). 592 593echo([]). 594echo([H|T]) :- 595 put_code(user_output, H), 596 echo(T). 597 598:- else. 599ansi_get_color(_Which0, _RGB) :- 600 fail. 601:- endif. 602 603 604 605:- multifile prolog:message//1. 606 607prologmessage(ansi(no_xterm_get_colour)) --> 608 [ 'Terminal claims to be xterm compatible,'-[], nl, 609 'but does not report colour info'-[] 610 ]
Print decorated text to ANSI consoles
This library allows for exploiting the color and attribute facilities of most modern terminals using ANSI escape sequences. This library provides the following:
The behavior of this library is controlled by two Prolog flags:
true, activate the color output for this library. Otherwise simply call format/3.url(Location)andurl(URL, Label)elements of Prolog messages.