/* Part of SWI-Prolog Author: Jan Wielemaker E-mail: J.Wielemaker@vu.nl WWW: http://www.swi-prolog.org Copyright (c) 2010-2023, VU University Amsterdam CWI, Amsterdam SWI-Prolog Solutions b.v. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(ansi_term, [ ansi_format/3, % +Attr, +Format, +Args ansi_get_color/2, % +Which, -rgb(R,G,B) ansi_hyperlink/2, % +Stream,+Location ansi_hyperlink/3 % +Stream,+URL,+Label ]). :- autoload(library(error), [domain_error/2, must_be/2, instantiation_error/1]). :- autoload(library(lists), [append/3]). :- autoload(library(utf8), [utf8_codes/3]). /** 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: - ansi_format/3 allows writing messages to the terminal with ansi attributes. - It defines the hook prolog:message_line_element/2, which provides ansi attributes and hyperlinks for print_message/2. The behavior of this library is controlled by two Prolog flags: - `color_term` When `true`, activate the color output for this library. Otherwise simply call format/3. - `hyperlink_term` Emit terminal hyperlinks for url(Location) and url(URL, Label) elements of Prolog messages. @see http://en.wikipedia.org/wiki/ANSI_escape_code */ :- multifile prolog:console_color/2, % +Term, -AnsiAttrs supports_get_color/0, hyperlink/2. % +Stream, +Spec color_term_flag_default(true) :- stream_property(user_input, tty(true)), stream_property(user_error, tty(true)), stream_property(user_output, tty(true)), \+ getenv('TERM', dumb), !. color_term_flag_default(false). init_color_term_flag :- color_term_flag_default(Default), create_prolog_flag(color_term, Default, [ type(boolean), keep(true) ]), create_prolog_flag(hyperlink_term, false, [ type(boolean), keep(true) ]). :- init_color_term_flag. :- meta_predicate keep_line_pos(+, 0). :- multifile user:message_property/2. %! ansi_format(+ClassOrAttributes, +Format, +Args) is det. % % Format text with ANSI attributes. This predicate behaves as % format/2 using Format and Args, but if the =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: % % - bold % - underline % - fg(Color), bg(Color), hfg(Color), hbg(Color) % For fg(Color) and bg(Color), the colour name can be '#RGB' or % '#RRGGBB' % - fg8(Spec), bg8(Spec) % 8-bit color specification. Spec is a colour name, h(Color) % or an integer 0..255. % - fg(R,G,B), bg(R,G,B) % 24-bit (direct color) specification. The components are % integers in the range 0..255. % % Defined color constants are below. =default= can be used to % access the default color of the terminal. % % - black, red, green, yellow, blue, magenta, cyan, white % % ANSI sequences are sent if and only if % % - The =current_output= has the property tty(true) (see % stream_property/2). % - The Prolog flag =color_term= is =true=. ansi_format(Attr, Format, Args) :- ansi_format(current_output, Attr, Format, Args). ansi_format(Stream, Class, Format, Args) :- stream_property(Stream, tty(true)), current_prolog_flag(color_term, true), !, class_attrs(Class, Attr), phrase(sgr_codes_ex(Attr), Codes), atomic_list_concat(Codes, ;, Code), with_output_to( Stream, ( keep_line_pos(current_output, format('\e[~wm', [Code])), format(Format, Args), keep_line_pos(current_output, format('\e[0m')) ) ), flush_output. ansi_format(Stream, _Attr, Format, Args) :- format(Stream, Format, Args). sgr_codes_ex(X) --> { var(X), !, instantiation_error(X) }. sgr_codes_ex([]) --> !. sgr_codes_ex([H|T]) --> !, sgr_codes_ex(H), sgr_codes_ex(T). sgr_codes_ex(Attr) --> ( { sgr_code(Attr, Code) } -> ( { is_list(Code) } -> list(Code) ; [Code] ) ; { domain_error(sgr_code, Attr) } ). list([]) --> []. list([H|T]) --> [H], list(T). %! sgr_code(+Name, -Code) % % True when code is the Select Graphic Rendition code for Name. % The defined names are given below. Note that most terminals only % implement this partially. % % | 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 | % % @see http://en.wikipedia.org/wiki/ANSI_escape_code sgr_code(reset, 0). sgr_code(bold, 1). sgr_code(faint, 2). sgr_code(italic, 3). sgr_code(underline, 4). sgr_code(blink(slow), 5). sgr_code(blink(rapid), 6). sgr_code(negative, 7). sgr_code(conceal, 8). sgr_code(crossed_out, 9). sgr_code(font(primary), 10) :- !. sgr_code(font(N), C) :- C is 10+N. sgr_code(fraktur, 20). sgr_code(underline(double), 21). sgr_code(intensity(normal), 22). sgr_code(fg(Name), C) :- ( ansi_color(Name, N) -> C is N+30 ; rgb(Name, R, G, B) -> sgr_code(fg(R,G,B), C) ). sgr_code(bg(Name), C) :- !, ( ansi_color(Name, N) -> C is N+40 ; rgb(Name, R, G, B) -> sgr_code(bg(R,G,B), C) ). sgr_code(framed, 51). sgr_code(encircled, 52). sgr_code(overlined, 53). sgr_code(ideogram(underline), 60). sgr_code(right_side_line, 60). sgr_code(ideogram(underline(double)), 61). sgr_code(right_side_line(double), 61). sgr_code(ideogram(overlined), 62). sgr_code(left_side_line, 62). sgr_code(ideogram(stress_marking), 64). sgr_code(-X, Code) :- off_code(X, Code). sgr_code(hfg(Name), C) :- ansi_color(Name, N), C is N+90. sgr_code(hbg(Name), C) :- !, ansi_color(Name, N), C is N+100. sgr_code(fg8(Name), [38,5,N]) :- ansi_color8(Name, N). sgr_code(bg8(Name), [48,5,N]) :- ansi_color8(Name, N). sgr_code(fg(R,G,B), [38,2,R,G,B]) :- between(0, 255, R), between(0, 255, G), between(0, 255, B). sgr_code(bg(R,G,B), [48,2,R,G,B]) :- between(0, 255, R), between(0, 255, G), between(0, 255, B). off_code(italic_and_franktur, 23). off_code(underline, 24). off_code(blink, 25). off_code(negative, 27). off_code(conceal, 28). off_code(crossed_out, 29). off_code(framed, 54). off_code(overlined, 55). ansi_color8(h(Name), N) :- !, ansi_color(Name, N0), N is N0+8. ansi_color8(Name, N) :- atom(Name), !, ansi_color(Name, N). ansi_color8(N, N) :- between(0, 255, N). ansi_color(black, 0). ansi_color(red, 1). ansi_color(green, 2). ansi_color(yellow, 3). ansi_color(blue, 4). ansi_color(magenta, 5). ansi_color(cyan, 6). ansi_color(white, 7). ansi_color(default, 9). rgb(Name, R, G, B) :- atom_codes(Name, [0'#,R1,R2,G1,G2,B1,B2]), hex_color(R1,R2,R), hex_color(G1,G2,G), hex_color(B1,B2,B). rgb(Name, R, G, B) :- atom_codes(Name, [0'#,R1,G1,B1]), hex_color(R1,R), hex_color(G1,G), hex_color(B1,B). hex_color(D1,D2,V) :- code_type(D1, xdigit(V1)), code_type(D2, xdigit(V2)), V is 16*V1+V2. hex_color(D1,V) :- code_type(D1, xdigit(V1)), V is 16*V1+V1. %! prolog:console_color(+Term, -AnsiAttributes) is semidet. % % Hook that allows for mapping abstract terms to concrete ANSI % attributes. This hook is used by _theme_ files to adjust the % rendering based on user preferences and context. Defaults are % defined in the file `boot/messages.pl`. % % @see library(theme/dark) for an example implementation and the Term % values used by the system messages. /******************************* * HOOK * *******************************/ %! prolog:message_line_element(+Stream, +Term) is semidet. % % Hook implementation that deals with ansi(+Attr, +Fmt, +Args) in % message specifications. prolog:message_line_element(S, ansi(Class, Fmt, Args)) :- class_attrs(Class, Attr), ansi_format(S, Attr, Fmt, Args). prolog:message_line_element(S, ansi(Class, Fmt, Args, Ctx)) :- class_attrs(Class, Attr), ansi_format(S, Attr, Fmt, Args), ( nonvar(Ctx), Ctx = ansi(_, RI-RA) -> keep_line_pos(S, format(S, RI, RA)) ; true ). prolog:message_line_element(S, url(Location)) :- ansi_hyperlink(S, Location). prolog:message_line_element(S, url(URL, Label)) :- ansi_hyperlink(S, URL, Label). prolog:message_line_element(S, begin(Level, Ctx)) :- level_attrs(Level, Attr), stream_property(S, tty(true)), current_prolog_flag(color_term, true), !, ( is_list(Attr) -> sgr_codes(Attr, Codes), atomic_list_concat(Codes, ;, Code) ; sgr_code(Attr, Code) ), keep_line_pos(S, format(S, '\e[~wm', [Code])), Ctx = ansi('\e[0m', '\e[0m\e[~wm'-[Code]). prolog:message_line_element(S, end(Ctx)) :- nonvar(Ctx), Ctx = ansi(Reset, _), keep_line_pos(S, write(S, Reset)). sgr_codes([], []). sgr_codes([H0|T0], [H|T]) :- sgr_code(H0, H), sgr_codes(T0, T). level_attrs(Level, Attrs) :- user:message_property(Level, color(Attrs)), !. level_attrs(Level, Attrs) :- class_attrs(message(Level), Attrs). class_attrs(Class, Attrs) :- user:message_property(Class, color(Attrs)), !. class_attrs(Class, Attrs) :- prolog:console_color(Class, Attrs), !. class_attrs(Class, Attrs) :- '$messages':default_theme(Class, Attrs), !. class_attrs(Attrs, Attrs). %! ansi_hyperlink(+Stream, +Location) is det. %! ansi_hyperlink(+Stream, +URL, +Label) is det. % % Create a hyperlink for a terminal emulator. The file is fairly easy, % but getting the line and column across is not as there seems to be % no established standard. The current implementation emits, i.e., % inserting a capital ``L`` before the line. % % ``file://AbsFileName[#LLine[:Column]]`` % % @see https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda ansi_hyperlink(Stream, Location) :- hyperlink(Stream, url(Location)), !. ansi_hyperlink(Stream, Location) :- location_label(Location, Label), ansi_hyperlink(Stream, Location, Label). location_label(File:Line:Column, Label) => format(string(Label), '~w:~w:~w', [File,Line,Column]). location_label(File:Line, Label) => format(string(Label), '~w:~w', [File,Line]). location_label(File, Label) => format(string(Label), '~w', [File]). ansi_hyperlink(Stream, Location, Label) :- hyperlink(Stream, url(Location, Label)), !. ansi_hyperlink(Stream, File:Line:Column, Label) :- !, ( url_file_name(URI, File) -> format(Stream, '\e]8;;~w#~d:~d\e\\~w\e]8;;\e\\', [ URI, Line, Column, Label ]) ; format(Stream, '~w', [Label]) ). ansi_hyperlink(Stream, File:Line, Label) :- !, ( url_file_name(URI, File) -> format(Stream, '\e]8;;~w#~w\e\\~w\e]8;;\e\\', [ URI, Line, Label ]) ; format(Stream, '~w', [Label]) ). ansi_hyperlink(Stream, File, Label) :- ( url_file_name(URI, File) -> format(Stream, '\e]8;;~w\e\\~w\e]8;;\e\\', [ URI, Label ]) ; format(Stream, '~w', [Label]) ). %! url_file_name(-URL, +File) is semidet. % % Same as uri_file_name/2 in mode (-,+), but as a core library we do % not wish to depend on the `clib` package and its foreign support. url_file_name(URL, File) :- current_prolog_flag(hyperlink_term, true), absolute_file_name(File, AbsFile), ensure_leading_slash(AbsFile, AbsFile1), url_encode_path(AbsFile1, Encoded), format(string(URL), 'file://~s', [Encoded]). ensure_leading_slash(Path, SlashPath) :- ( sub_atom(Path, 0, _, _, /) -> SlashPath = Path ; atom_concat(/, Path, SlashPath) ). url_encode_path(Name, Encoded) :- atom_codes(Name, Codes), phrase(utf8_codes(Codes), UTF8), phrase(encode(UTF8), Encoded). encode([]) --> []. encode([H|T]) --> encode1(H), encode(T). encode1(C) --> { reserved(C), !, format(codes([C1,C2]), '~`0t~16r~2|', [C]) }, "%", [C1,C2]. encode1(C) --> [C]. reserved(C) :- C =< 0'\s. reserved(C) :- C >= 127. reserved(0'#). %! keep_line_pos(+Stream, :Goal) % % Run goal without changing the position information on Stream. This % is used to avoid that the exchange of ANSI sequences modifies the % notion of, notably, the `line_pos` notion. keep_line_pos(S, G) :- stream_property(S, position(Pos)), !, setup_call_cleanup( stream_position_data(line_position, Pos, LPos), G, set_stream(S, line_position(LPos))). keep_line_pos(_, G) :- call(G). %! ansi_get_color(+Which, -RGB) is semidet. % % Obtain the RGB color for an ANSI color parameter. Which is either a % color alias or an integer ANSI color id. Defined aliases are % `foreground` and `background`. This predicate sends a request to the % console (`user_output`) and reads the reply. This assumes an `xterm` % compatible terminal. % % @arg RGB is a term rgb(Red,Green,Blue). The color components are % integers in the range 0..65535. ansi_get_color(Which0, RGB) :- stream_property(user_input, tty(true)), stream_property(user_output, tty(true)), stream_property(user_error, tty(true)), supports_get_color, ( color_alias(Which0, Which) -> true ; must_be(between(0,15),Which0) -> Which = Which0 ), catch(keep_line_pos(user_output, ansi_get_color_(Which, RGB)), error(timeout_error(_,_), _), no_xterm). supports_get_color :- getenv('TERM', Term), sub_atom(Term, 0, _, _, xterm), \+ getenv('TERM_PROGRAM', 'Apple_Terminal'). color_alias(foreground, 10). color_alias(background, 11). ansi_get_color_(Which, rgb(R,G,B)) :- format(codes(Id), '~w', [Which]), hex4(RH), hex4(GH), hex4(BH), phrase(("\e]", Id, ";rgb:", RH, "/", GH, "/", BH, "\a"), Pattern), stream_property(user_input, timeout(Old)), setup_call_cleanup( set_stream(user_input, timeout(0.05)), with_tty_raw(exchange_pattern(Which, Pattern)), set_stream(user_input, timeout(Old))), !, hex_val(RH, R), hex_val(GH, G), hex_val(BH, B). no_xterm :- print_message(warning, ansi(no_xterm_get_colour)), fail. hex4([_,_,_,_]). hex_val([D1,D2,D3,D4], V) :- code_type(D1, xdigit(V1)), code_type(D2, xdigit(V2)), code_type(D3, xdigit(V3)), code_type(D4, xdigit(V4)), V is (V1<<12)+(V2<<8)+(V3<<4)+V4. exchange_pattern(Which, Pattern) :- format(user_output, '\e]~w;?\a', [Which]), flush_output(user_output), read_pattern(user_input, Pattern, []). read_pattern(From, Pattern, NotMatched0) :- copy_term(Pattern, TryPattern), append(Skip, Rest, NotMatched0), append(Rest, RestPattern, TryPattern), !, echo(Skip), try_read_pattern(From, RestPattern, NotMatched, Done), ( Done == true -> Pattern = TryPattern ; read_pattern(From, Pattern, NotMatched) ). %! try_read_pattern(+From, +Pattern, -NotMatched) try_read_pattern(_, [], [], true) :- !. try_read_pattern(From, [H|T], [C|RT], Done) :- get_code(C), ( C = H -> try_read_pattern(From, T, RT, Done) ; RT = [], Done = false ). echo([]). echo([H|T]) :- put_code(user_output, H), echo(T). :- multifile prolog:message//1. prolog:message(ansi(no_xterm_get_colour)) --> [ 'Terminal claims to be xterm compatible,'-[], nl, 'but does not report colour info'-[] ].