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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /systems/unix/tex-gpc/mp/mp.ch
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+% This is a change file of METAPOST for GPC, Wolfgang Helbig, Aug. 2008
+% See tex.ch and mf.ch from tex-gpc
+[0] to print changed sections only
+@x
+\def\gglob{20, 26} % this should be the next two sections of "<Global...>"
+@y
+\def\gglob{20, 26} % this should be the next two sections of "<Global...>"
+\input webmac-gpc
+\emergencystretch 0.5in % avoid overfull boxes
+
+% \let\maybe=\iffalse % uncomment to print changed modules only.
+
+\def\name{\MP}
+
+\N0\*. \[0] About \namegpc.
+
+This is an adaption of John Hobby's \MP, version 0.641, to Unix,
+and GNU~Pascal, version 2.1.
+
+The features added include treating the command line as the first
+input line and invoking a system editor, in this case \.{vi}, to
+let the user correct the input file.
+On exit, \namegpc\ passes its `history' to the operating system.
+
+\hint
+
+Comments and questions are welcome!
+
+\bigskip
+\address
+\fi
+@z
+
+[2] Change the banner line
+@x
+@d banner=='This is MetaPost, Version 0.641' {printed when \MP\ starts}
+@y
+@d banner=='This is MetaPost-GPC' {printed when \MP\ starts}
+@z
+
+[4] terminal output and input
+@x
+@d mtype==t@&y@&p@&e {this is a \.{WEB} coding trick:}
+@y
+@d term_in==i@&n@&p@&u@&t
+@d term_out==o@&u@&t@&p@&u@&t
+@d mtype==t@&y@&p@&e {this is a \.{WEB} coding trick:}
+@z
+
+[4] terminal output and input
+@x
+program MP; {all file names are defined dynamically}
+@y
+program MP(@!term_in,@!term_out);
+{all other file names are defined dynamically}
+import gpc only (gpc_execute,gpc_install_signal_handler,
+ gpc_t_signal_handler, gpc_sig_int);
+@z
+
+[4] forward reference for signal handler
+@x
+procedure initialize; {this procedure gets things started properly}
+@y
+procedure set_interrupt(signal: gpc_integer); forward; @t\2@>
+{|initialize| installs |set_interrupt| as a Unix signal handler}
+@#
+procedure initialize; {this procedure gets things started properly}
+@z
+
+Since @x, @y, and @z only define a change block when they begin a
+line, you deactivate a block by indenting it (shift right) and
+activate it by unindenting it (shift left). With vi set the
+cursor to the @x line and enter >} or <} to (un)indent a paragraph.
+
+[7] shift left to turn debugging on, right to turn it off
+@x
+@d debug==@{ {change this to `$\\{debug}\equiv\null$' when debugging}
+@d gubed==@t@>@} {change this to `$\\{gubed}\equiv\null$' when debugging}
+@y
+@d debug== {change this to `$\\{debug}\equiv\.{@@\{}$' when not debugging}
+@d gubed== {change this to `$\\{gubed}\equiv\.{@@\}}$' when not debugging}
+@z
+
+[7] shift left to turn on statistics, shift rigth to turn off statistics
+@x
+@d stat==@{ {change this to `$\\{stat}\equiv\null$' when gathering
+ usage statistics}
+@d tats==@t@>@} {change this to `$\\{tats}\equiv\null$' when gathering
+ usage statistics}
+@y
+@d stat== {change this to `$\\{stat}\equiv\.{@@\{}$' to turn off statistics}
+@d tats== {change this to `$\\{tats}\equiv\.{@@\}}$' to turn off statistics}
+@z
+
+[8] shift left to build MP and right it to build INIMP.
+ @x inimp
+ @d init== {change this to `$\\{init}\equiv\.{@@\{}$' in the production version}
+ @d tini== {change this to `$\\{tini}\equiv\.{@@\}}$' in the production version}
+ @y
+ @d init==@{
+ @d tini==@}
+ @z
+
+[9] compiler directives, turn off I/O checking.
+@x
+@{@&$C-,A+,D-@} {no range check, catch arithmetic overflow, no debug overhead}
+@!debug @{@&$C+,D+@}@+ gubed {but turn everything on when debugging}
+@y
+@{@&$I-@} {no I/O checking}
+@z
+
+[10] default case branch
+@x
+@d othercases == others: {default for cases not listed explicitly}
+@y
+@d othercases == @+ else {default for cases not listed explicitly}
+@z
+
+[11] location of pool file
+@x
+@!pool_name='MPlib:MP.POOL ';
+ {string of length |file_name_size|; tells where the string pool appears}
+@.MPlib@>
+@!ps_tab_name='MPlib:PSFONTS.MAP ';
+ {string of length |file_name_size|; locates font name translation table}
+@y
+@!pool_name='MPlib/mp.pool ';
+ {string of length |file_name_size|; tells where the string pool appears}
+@.MPlib@>
+@!ps_tab_name='MPlib/psfonts.map ';
+ {string of length |file_name_size|; locates font name translation table}
+@z
+
+
+[22] accept tab and formfeed
+@x
+for i:=0 to @'37 do xchr[i]:=' ';
+@y
+for i:=0 to @'37 do xchr[i]:=' ';
+xchr[@'11] := chr(@'11); {accept horizontal tab}
+xchr[@'14] := chr(@'14); {accept form feed}
+@z
+
+[24] the type of text_files is text in ISO Pascal
+@x
+@!eight_bits=0..255; {unsigned one-byte quantity}
+@!alpha_file=packed file of text_char; {files that contain textual data}
+@y
+@!eight_bits=packed 0..255; {unsigned one-byte quantity}
+@!alpha_file=t@&e@&x@&t; {coding trick is needed since |text| is a macro}
+@z
+
+[26] dynamic io
+@x
+@d reset_OK(#)==erstat(#)=0
+@d rewrite_OK(#)==erstat(#)=0
+@y
+@d gpc_trim==t@&r@&i@&m
+@d gpc_io_result==i@&o@&r@&e@&s@&u@&l@&t
+@d reset_OK(#)==gpc_io_result=0
+@d rewrite_OK(#)==gpc_io_result=0
+@d clear_io_result==@+if gpc_io_result=0 then do_nothing
+@z
+
+[26] (reset and rewrite for each of three file types) alpha
+@x
+begin reset(f,name_of_file,'/O'); a_open_in:=reset_OK(f);
+@y
+begin clear_io_result; reset(f,gpc_trim(name_of_file)); a_open_in:=reset_OK(f);
+@z
+
+[26]
+@x
+begin rewrite(f,name_of_file,'/O'); a_open_out:=rewrite_OK(f);
+@y
+begin clear_io_result; rewrite(f,gpc_trim(name_of_file));
+a_open_out:=rewrite_OK(f);
+@z
+
+[26] byte file
+@x
+begin reset(f,name_of_file,'/O'); b_open_in:=reset_OK(f);
+@y
+begin clear_io_result; reset(f,gpc_trim(name_of_file)); b_open_in:=reset_OK(f);
+@z
+
+@x
+begin rewrite(f,name_of_file,'/O'); b_open_out:=rewrite_OK(f);
+@y
+begin clear_io_result; rewrite(f,gpc_trim(name_of_file));
+b_open_out:=reset_OK(f);
+@z
+
+[26] word_file
+@x
+begin reset(f,name_of_file,'/O'); w_open_in:=reset_OK(f);
+@y
+begin clear_io_result; reset(f,gpc_trim(name_of_file)); w_open_in:=reset_OK(f);
+@z
+
+[26]
+@x
+begin rewrite(f,name_of_file,'/O'); w_open_out:=rewrite_OK(f);
+@y
+begin clear_io_result; rewrite(f,gpc_trim(name_of_file));
+w_open_out:=rewrite_OK(f);
+@z
+
+[30] eoln handling
+@x
+@p function input_ln(var @!f:alpha_file;@!bypass_eoln:boolean):boolean;
+ {inputs the next line or returns |false|}
+var @!last_nonblank:0..buf_size; {|last| with trailing blanks removed}
+begin if bypass_eoln then if not eof(f) then get(f);
+ {input the first character of the line into |f^|}
+last:=first; {cf.\ Matthew 19\thinspace:\thinspace30}
+if eof(f) then input_ln:=false
+else begin last_nonblank:=first;
+ while not eoln(f) do
+ begin if last>=max_buf_stack then
+ begin max_buf_stack:=last+1;
+ if max_buf_stack=buf_size then
+ @<Report overflow of the input buffer, and abort@>;
+ end;
+ buffer[last]:=xord[f^]; get(f); incr(last);
+ if buffer[last-1]<>" " then last_nonblank:=last;
+ end;
+ last:=last_nonblank; input_ln:=true;
+ end;
+end;
+@y
+@p function input_ln(var f:alpha_file;@!bypass_eoln:boolean):boolean;
+ {inputs the next line or returns |false|}
+begin
+ {ignore |bypass_eoln|. Assuming |f| being positioned at the first character}
+last:=first; {cf.\ Matthew 19\thinspace:\thinspace30}
+if eof(f) then input_ln:=false
+else begin
+ while not eoln(f) do
+ begin if last>=max_buf_stack then
+ begin max_buf_stack:=last+1;
+ if max_buf_stack=buf_size then begin
+ read_ln(f); {complete the current line}
+ @<Report overflow of the input buffer, and abort@>;
+ end;
+ end;
+ buffer[last]:=xord[f^]; get(f); incr(last);
+ end;
+ get(f); {Advance |f| to the first character of the next line}
+ input_ln:=true;
+ end;
+end;
+@z
+
+[31] term_in and term_out are the standard pascal files
+@x
+is considered an output file the file variable is |term_out|.
+@^system dependencies@>
+
+@<Glob...@>=
+@!term_in:alpha_file; {the terminal as an input file}
+@!term_out:alpha_file; {the terminal as an output file}
+@y
+is considered an output file the file variable is |term_out|.
+The file |term_in| is declared as \\{input} and |term_out| as
+\\{output} in the program header.
+@z
+
+[32]
+@x
+@d t_open_in==reset(term_in,'TTY:','/O/I') {open the terminal for text input}
+@d t_open_out==rewrite(term_out,'TTY:','/O') {open the terminal for text output}
+@y
+@d t_open_in==do_nothing {open the terminal for text input}
+@d t_open_out==do_nothing {open the terminal for text output}
+@z
+
+[33]
+@x
+@d update_terminal == break(term_out) {empty the terminal output buffer}
+@d clear_terminal == break_in(term_in,true) {clear the terminal input buffer}
+@y
+@d update_terminal == do_nothing {empty the terminal output buffer}
+@d clear_terminal == do_nothing {clear the terminal input buffer}
+@z
+
+[35] command line
+@x
+@d loc==cur_input.loc_field {location of first unread character in |buffer|}
+@y
+@d loc==cur_input.loc_field {location of first unread character in |buffer|}
+@d gpc_string==s@&t@&r@&i@&n@&g {a string with varying length}
+@d gpc_length==l@&e@&n@&g@&t@&h
+@d gpc_param_count==p@&a@&r@&a@&m@&c@&o@&u@&n@&t
+@d gpc_param_str==p@&a@&r@&a@&m@&s@&t@&r
+
+{GPC function returning the length of a |gpc_string|}
+
+@p procedure input_command_ln; {get the command line in |buffer|}
+var argc: integer; {argument counter}
+ arg: gpc_string; {argument}
+ cc: integer; {character counter in argument}
+begin last := first; argc := 1;
+while argc <= gpc_param_count do
+ begin cc := 1; arg := gpc_param_str(argc); incr(argc);
+ while cc <= gpc_length(arg) do
+ begin
+ if last+1>=buf_size then
+ @<Report overflow of the input buffer, and abort@>;
+ buffer[last] := xord[arg[cc]]; incr(last); incr(cc);
+ end;
+ if (argc <= gpc_param_count) then begin
+ buffer[last] := " "; incr(last);
+ end;
+ end;
+end;
+@z
+
+[36] command line
+@x
+@p function init_terminal:boolean; {gets the terminal input started}
+label exit;
+begin t_open_in;
+loop@+begin wake_up_terminal; write(term_out,'**'); update_terminal;
+@.**@>
+ if not input_ln(term_in,true) then {this shouldn't happen}
+ begin write_ln(term_out);
+ write(term_out,'! End of file on the terminal... why?');
+@.End of file on the terminal@>
+ init_terminal:=false; return;
+ end;
+ loc:=first;
+ while (loc<last)and(buffer[loc]=" ") do incr(loc);
+ if loc<last then
+ begin init_terminal:=true;
+ return; {return unless the line was all blank}
+ end;
+ write_ln(term_out,'Please type the name of your input file.');
+ end;
+exit:end;
+@y
+@p function init_terminal:boolean; {gets the terminal input started}
+label exit;
+begin t_open_in; input_command_ln;
+while first=last do begin
+ wake_up_terminal; write(term_out,'**'); update_terminal;
+@.**@>
+ if not input_ln(term_in, true) then {this shouldn't happen}
+ begin write_ln(term_out);
+ write_ln(term_out,'! End of file on the terminal... why?');
+@.End of file on the terminal@>
+ init_terminal:=false; return;
+ end;
+ if first=last then
+ write_ln(term_out,'Please type the name of your input file.');
+ end;
+loc := first; {trim leading spaces}
+while buffer[loc]=" " do incr(loc);
+init_terminal:=true;
+exit: end;
+@z
+
+[76] print banner line on terminal
+@x
+@<Initialize the output...@>=
+update_terminal;
+@y
+@<Initialize the output...@>=
+wterm(banner);
+if mem_ident=0 then wterm_ln(' (no mem preloaded)')
+else begin print(mem_ident); print_ln;
+ end;
+update_terminal;
+@z
+
+[89] start editor
+@x
+@!use_err_help:boolean; {should the |err_help| string be shown?}
+@y
+@!use_err_help:boolean; {should the |err_help| string be shown?}
+@!edit_line: integer; {line number to be passed to the system editor}
+@!edit_file_name: str_number; {file name to be passed to the system editor}
+@z
+
+[90] initial value for edit argument
+@x
+help_ptr:=0; use_err_help:=false; err_help:=0;
+@y
+help_ptr:=0; use_err_help:=false; err_help:=0;
+edit_line:=0; edit_file_name:=0;
+@z
+
+[94] set edit_cmd
+@x
+ begin print_nl("You want to edit file ");
+@.You want to edit file x@>
+ print(input_stack[file_ptr].name_field);
+ print(" at line "); print_int(true_line);@/
+ interaction:=scroll_mode; jump_out;
+ end;
+@y
+ begin {save values to be passed to the system editor}
+ edit_file_name := input_stack[file_ptr].name_field;
+ add_str_ref(edit_file_name);
+ edit_line := true_line;
+ interaction:=scroll_mode; jump_out;
+ end;
+@z
+
+[106] interrupt is predefined and not implemented in GNU~Pascal
+@x
+@d check_interrupt==begin if interrupt<>0 then pause_for_instructions;
+@y
+@d interrupt==buginterrupt
+@f interrupt==true
+@d check_interrupt==begin if interrupt<>0 then pause_for_instructions;
+@z
+
+[171] pack subranges
+@x
+@!quarterword = min_quarterword..max_quarterword; {1/4 of a word}
+@!halfword=min_halfword..max_halfword; {1/2 of a word}
+@y
+@!quarterword = packed min_quarterword..max_quarterword; {1/4 of a word}
+@!halfword=packed min_halfword..max_halfword; {1/2 of a word}
+@z
+
+[212] time and date
+@x
+begin internal[time]:=12*60*unity; {minutes since midnight}
+internal[day]:=4*unity; {fourth day of the month}
+internal[month]:=7*unity; {seventh month of the year}
+internal[year]:=1776*unity; {Anno Domini}
+@y
+var t: time_stamp;
+begin
+get_time_stamp(t);
+internal[time]:=(t.minute + t.hour*60)*unity; {minutes since midnight}
+internal[day]:=t.d@&a@&y*unity;
+internal[month]:=t.m@&o@&n@&t@&h*unity;
+internal[year]:=t.y@&e@&a@&r*unity; {Anno Domini}
+@z
+
+[217] character class for tab and lf
+@x
+for k:=127 to 255 do char_class[k]:=invalid_class;
+@y
+for k:=127 to 255 do char_class[k]:=invalid_class;
+char_class[@'11] := space_class;
+char_class[@'14] := space_class;
+@z
+
+[640] spurious empty line on terminal
+@x
+ print_ln; first:=start;
+ prompt_input("*"); {input on-line into |buffer|}
+@y
+ print_nl("");
+ first:=start; {avoid empty lines on terminal and log file}
+ prompt_input("*"); {input on-line into |buffer|}
+@z
+
+[746] Path separator in Unix
+@x
+@d MP_area=="MPinputs:"
+@.MPinputs@>
+@d MF_area=="MFinputs:"
+@.MFinputs@>
+@d MP_font_area=="TeXfonts:"
+@.TeXfonts@>
+@y
+@d MP_area=="MPinputs/"
+@.MPinputs@>
+@d MF_area=="MFinputs/"
+@.MFinputs@>
+@d MP_font_area=="TeXfonts/"
+@.TeXfonts@>
+@z
+
+[748]
+@x
+else begin if (c=">")or(c=":") then
+@y
+else begin if c="/" then
+@z
+
+[752]
+@x
+MP_mem_default:='MPlib:plain.mem';
+@y
+MP_mem_default:='MPlib/plain.mem';
+@z
+
+[771] filename is needed for system editor
+@x
+flush_string(name); name:=cur_name; cur_name:=0
+@y
+do_nothing
+@z
+
+[1298]
+@x
+@p begin @!{|start_here|}
+@y
+@d gpc_halt == h@&a@&l@&t
+
+@p begin @!{|start_here|}
+@z
+
+[1298] load the mem file before printing the banner line
+@x
+start_of_MP: @<Initialize the output routines@>;
+@y
+start_of_MP: @<Preload the default mem file@>;
+@<Initialize the output routines@>;
+@z
+
+[1298] start editor and pass history
+@x
+final_end: ready_already:=0;
+@y
+final_end:
+if edit_file_name > 0 then start_editor; {user typed `\.{E}'}
+gpc_halt(history);
+ {pass |history| as the exit value to the system}
+@z
+
+[1299] print last end-of-line marker if needed
+@x
+if log_opened then
+ begin wlog_cr;
+ a_close(log_file); selector:=selector-2;
+ if selector=term_only then
+ begin print_nl("Transcript written on ");
+@.Transcript written...@>
+ print(log_name); print_char(".");
+ end;
+ end;
+end;
+@y
+if log_opened then
+ begin if file_offset > 0 then wlog_cr;
+ a_close(log_file); selector:=selector-2;
+ if selector=term_only then
+ begin print_nl("Transcript written on ");
+@.Transcript written...@>
+ print(log_name); print_char(".");
+ end;
+ end;
+ if term_offset > 0 then wterm_cr;
+end;
+@z
+
+[1307] return if eof
+@x
+ read(term_in,m);
+@y
+ if eof(term_in) then return;
+ {don't try to read past end of file}
+ read(term_in,m);
+@z
+
+[1307] return if eof
+@x
+ else begin read(term_in,n);
+@y
+ else begin if eof(term_in) then return;
+ {don't try to read past end of file}
+ read(term_in,n);
+@z
+
+[1308] return eof
+@x
+13: begin read(term_in,l); print_cmd_mod(n,l);
+@y
+13: begin if eof(term_in) then return;
+ {don't try to read past end of file}
+read(term_in,l); print_cmd_mod(n,l);
+@z
+
+[1309 and modules added for METAPOST-GPC]
+@x
+itself will get a new section number.
+@^system dependencies@>
+@y
+itself will get a new section number.
+@^system dependencies@>
+
+@ Try to preload the default mem file. This is called even before
+the first line is read from the terminal, and thus turns \.{VIRMP}
+into \.{MP}, at least as seen by the user.
+
+\indent\.{INIMP} sets |mem_ident| to `\.{INIMP}' and won't load a mem
+file here.
+
+@<Preload the default mem file@> =
+if mem_ident = 0 then
+ begin pack_buffered_name(mem_default_length - mem_ext_length, 1, 0);
+ if not w_open_in(mem_file) then
+ begin
+ wterm_ln('I can''t find the mem file');
+ goto final_end
+ end;
+ if not load_mem_file then
+ begin w_close(mem_file); goto final_end
+ end;
+ w_close(mem_file);
+ end
+
+@
+@d gpc_execute == e@&x@&e@&c@&u@&t@&e
+@d gpc_write_str == w@&r@&i@&t@&e@&s@&t@&r
+
+@<Error hand...@>=
+procedure start_editor;
+var i: integer; {index into |name_of_file|}
+ j: pool_pointer; {index into |str_pool|}
+ cmd_line: gpc_string(200); {area to build the command line}
+begin i := 1; j := str_start[edit_file_name];
+while j<str_stop(edit_file_name) do
+ begin name_of_file[i] := xchr[str_pool[j]]; incr(i); incr(j)
+ end;
+while i<=file_name_size do begin name_of_file[i] := ' '; incr(i) end;
+gpc_write_str(cmd_line, 'vi +', edit_line, ' ', gpc_trim(name_of_file));
+if 0 <> gpc_execute(cmd_line) then
+ write_ln(gpc_param_str(0), ': could not start editor with: "',
+ cmd_line, '"');
+end;
+
+@
+@d gpc_t_signal_handler == t@&s@&i@&g@&n@&a@&l@&h@&a@&n@&d@&l@&e@&r
+@d gpc_install_signal_handler ==
+ i@&n@&s@&t@&a@&l@&l@&s@&i@&g@&n@&a@&l@&h@&a@&n@&d@&l@&e@&r
+@d gpc_sig_int == s@&i@&g@&i@&n@&t
+@d gpc_integer == integer {for later versions of GPC (3.4+) replace
+ \\{integer} by \\{cinteger}}
+
+@<Error hand...@>=
+procedure set_interrupt(signal: gpc_integer);
+begin interrupt := 1 @+end;
+
+@
+@<Set initial values ... @>=
+gpc_install_signal_handler(gpc_sig_int,set_interrupt,true,true,dummy_handler,
+ dummy_boolean);
+
+@ Here are two variables that are needed to install |set_interrupt|.
+@<Local variables for initialization@> =
+dummy_handler: gpc_t_signal_handler;
+dummy_boolean: boolean;
+@z