From d45367cc9101e4f0e03d1e77d5c7cc10b00567ba Mon Sep 17 00:00:00 2001 From: Kai Stevenson Date: Tue, 1 Aug 2023 13:11:32 -0700 Subject: added phplatex --- src/phplatex.php | 142 ++++++++++++++++++++++++++++++++++++++++++ src/writing/derivative.php | 16 +++++ src/writing/images/.gitignore | 1 + src/writing/index.php | 20 +++--- src/writing/tmp/.gitignore | 1 + updatesite | 1 + 6 files changed, 174 insertions(+), 7 deletions(-) create mode 100644 src/phplatex.php create mode 100644 src/writing/derivative.php create mode 100644 src/writing/images/.gitignore create mode 100644 src/writing/tmp/.gitignore diff --git a/src/phplatex.php b/src/phplatex.php new file mode 100644 index 0000000..f8bebeb --- /dev/null +++ b/src/phplatex.php @@ -0,0 +1,142 @@ +300) $dpi=300; + + $back = phplatex_colorhex($br,$bg,$bb); + $fore = phplatex_colorhex($r,$g,$b); + + # Figure out TeX string, either to get the right cache entry, or to compile + # Adds semi-common symbol packages (ams) + # used to include ,landscape in documentclass to avoid page wrapping, but it seems this sometimes implies 90 degree rotation + $totex = "\\documentclass[14pt]{extarticle}\n". + "\\usepackage{color}\n". + "\\usepackage{amsmath}\n\\usepackage{amsfonts}\n\\usepackage{amssymb}\n". + $extraprelude."\n". + "\\pagestyle{empty}\n". #removes header/footer; necessary for trim + "\\begin{document}\n". + "\\color[rgb]{".$r.",".$g.",".$b."}\n". + "\\pagecolor[rgb]{".$br.",".$bg.",".$bb."}\n". + $string."\n". + "\\end{document}\n"; + $hashfn = sha1($totex).".".$dpi.".".$fore.".".$back.".".intval($trans); #file cache entry string: 40-char hash string plus size + $stralt = str_replace("&","&", preg_replace("/[\"\n]/","",$string)); # stuck in the alt and title attributes + # May need some extra safety. + $heredir = getcwd(); + + # Experiment: Tries to adjust vertical positioning, so that rendered TeX text looks natural enough inline with HTML text + # Only descenders are really a problem since HTML's leeway is upwards. + # Some things vary per font, e.g. the slash. In the default CM it is a descender, in Times and others it isn't. + # TODO: This can always use more work. + # TODO: Avoid using characters that are part of TeX commands. + $ascenders ="/(b|d|f|h|i|j|k|l|t|A|B|C|D|E|F|G|H|I|J|L|K|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z|\[|\]|\\{|\\}|\(|\)|\/|0|1|2|3|4|5|6|7|8|9|\\#|\*|\?|'|\\\\'|\\\\`|\\\\v)/"; + $monoliners="/(a|c|e|m|n|o|r|s|u|v|w|x|z|-|=|\+|:|.)/"; + $descenders="/(g|j|p|\/|q|y|Q|,|;|\[|\]|\\{|\\}|\(|\)|\#|\\\\LaTeX|\\\\TeX|\\\\c\{)/"; + $deepdescenders="/(\[|\]|\\{|\\}|\(|\)|\\int)/"; + + error_reporting(0); + $ba = preg_match_all($ascenders, $string,$m); + $bm = preg_match_all($monoliners, $string,$m); + $bd = preg_match_all($descenders, $string,$m); + $dd = preg_match_all($deepdescenders, $string,$m); + error_reporting(E_ERROR | E_PARSE | E_WARNING | E_NOTICE); + if ($dd>0) $verticalalign="vertical-align: -25%"; # deep descenders: move down + else if ($bd>0 && $ba==0) $verticalalign="vertical-align: -15%"; # descenders: move down + else if ($bd==0 && $ba>0) $verticalalign="vertical-align: 0%"; # ascenders only: move up/do nothing? + else if ($bd==0 && $ba==0) $verticalalign="vertical-align: 0%"; # neither vertical-align: 0% + else $verticalalign="vertical-align: -15%"; # both ascender and regular descender + + + # check if image for that TeX in the cache, return img HTML if it exists + if (file_exists($heredir.'/images/'.$hashfn.'.'.$imgfmt)) + return ''.$stralt.''; + + # otherwise try to make and store: + + # chdir to have superfluous files be created in just one place, tmp/ (you probably want to occasionally clean this yourself) + error_reporting(0); # TODO: fetch current value so we can restore it + if (chdir("tmp")===FALSE) { return '[tmp directory access error, please fix permissions]'; } #I should think about some more specific errors, e.g. check whether file creation is allowed + error_reporting(E_ERROR | E_PARSE | E_WARNING | E_NOTICE); + + $tfn = tempnam(getcwd(), 'PTX'); # unique base path in tmp dir + + #write temporary .tex file + if ( ($tex = fopen($tfn.'.tex', "w"))==FALSE) { return '[tex file access error] '.phplatex_cleantmp($tfn,$heredir); } + fwrite($tex, $totex); + fclose($tex); + + + # Run latex to create a .dvi. Have it try to fix minor errors instead of breaking/pausing on them. + exec($path_to_latex.' --interaction=nonstopmode '.$tfn.'.tex'); + if (!file_exists($tfn.".dvi")) { + $log = file_get_contents($tfn.'.log'); #The log always exists, but now it's actually interesting since it'll contain an error + return '[latex error, code follows]
'.$totex.'

Log file:

'.$log.'

'.phplatex_cleantmp($tfn,$heredir); + } + + + # DVI -> PostScript. Since dvips uses lpr, which may be configured to actually print by default, force writing to a file with -o + exec($path_to_dvips.' '.$tfn.'.dvi -o '.$tfn.'.ps'); + if ( !file_exists($tfn.'.ps')) { + return '[dvi2ps error] '.phplatex_cleantmp($tfn,$heredir); + } + + + # PostScript -> image. Also trim based on corner pixel and set transparent color. + $convert_cmd = $path_to_convert; + if ($trans) { + $convert_cmd .= ' -transparent-color "#'.$back.'" -transparent "#'.$back.'"'; + } + $convert_cmd .= ' -colorspace RGB -density '.$dpi.' -trim +page '.$tfn.'.ps '.$tfn.'.'.$imgfmt; + + exec($convert_cmd); + #Note: +page OR -page +0+0 OR +repage moves the image to the cropped area (kills offset) + #Older code tried: exec('/usr/bin/mogrify -density 90 -trim +page -format $imgfmt '.$tfn.'.ps'); + # It seems some versions of convert may not have -trim. Old versions? + + if (!file_exists($tfn.'.'.$imgfmt)) { + return '[image convert error] '.phplatex_cleantmp($tfn,$heredir); + } + + # Copy result image to chache. + copy($tfn.'.'.$imgfmt, $heredir.'/images/'.$hashfn.'.'.$imgfmt); + + # Clean up temporary files, and return link to just-created image + return phplatex_cleantmp($tfn,$heredir).'LaTeX formula: '.$stralt.''; +} +?> diff --git a/src/writing/derivative.php b/src/writing/derivative.php new file mode 100644 index 0000000..28bc00d --- /dev/null +++ b/src/writing/derivative.php @@ -0,0 +1,16 @@ + +

+ Calculus is often used as the complete name of a branch of mathematics dealing with + rates of change and very small numbers. In fact, a calculus is a specific discipline + or method for the analysis of some set of problems. The fact that the calculus of infinitesimals + has come to known in this way is a testament to its importance. +

+

+ +

+ diff --git a/src/writing/images/.gitignore b/src/writing/images/.gitignore new file mode 100644 index 0000000..f935021 --- /dev/null +++ b/src/writing/images/.gitignore @@ -0,0 +1 @@ +!.gitignore diff --git a/src/writing/index.php b/src/writing/index.php index bba0f99..c354f70 100644 --- a/src/writing/index.php +++ b/src/writing/index.php @@ -11,26 +11,32 @@ require($_SERVER["DOCUMENT_ROOT"] . "/header.php");

Essays

- Moderately structured, opinionated writing. If you're the psychoanalytical type, you may be interested to know - that I find it much more fun to deconstruct a question than to construct an answer. + Moderately structured, opinionated writing.

+

Mathematics

+

+ My writing in Greek. +

+

Manifestos

Plural. For future-proofness.

Esoterica

The fun stuff.

diff --git a/src/writing/tmp/.gitignore b/src/writing/tmp/.gitignore new file mode 100644 index 0000000..f935021 --- /dev/null +++ b/src/writing/tmp/.gitignore @@ -0,0 +1 @@ +!.gitignore diff --git a/updatesite b/updatesite index ddf0781..4578c5f 100755 --- a/updatesite +++ b/updatesite @@ -1,4 +1,5 @@ rsync -avzP --delete ./src/ root@aberrantflux.xyz:/srv/http/aberrantflux-site +ssh root@aberrantflux.xyz "cd /srv/http/aberrantflux-site ; chown -R http:http writing/tmp writing/images" if [ $# -eq 0 ]; then exit 0 -- cgit v1.2.3-70-g09d2