Cygwin support

[edemaine]

I've been using LaTeX Workshop with Cygwin texlive for some time. Recently (a month ago?) the way that SyncTeX works changed a little, so I had to update my settings.json. I thought I'd share in case anyone else wants to live the dangerous life of LaTeX Workshop + Cygwin (which is officially unsupported).

The main ideas in this config:

1. -outdir=\"cygpath "%OUTDIR%"\" \"cygpath -u "%DOC%"\" converts Windows paths into Unix paths when calling pdflatex or latexmk
2. | sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g' converts Unix paths in LaTeX's output into Windows paths (though they have forward slashes instead of backslashes, VSCode is generally OK with this)
3. (gunzip -kf %DOCFILE%.synctex.gz && sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g;s#/#\\\\\\\\#g' <%DOCFILE%.synctex | gzip -c - >%DOCFILE%.synctex.gz ; rm -f %DOCFILE%.synctex) modifies the .synctex.gz file to use Windows paths instead of Unix paths so that synctex works when given a Windows path. (It would be nice if I could override the call to synctex, but I believe the arguments are not configurable at this point.) This is the part that changed recently: I had to convert forward slashes to backslashes for synctex to be happy.

Full config of latex-workshop.latex.tools:

    "latex-workshop.latex.tools": [
        {
                "name": "latexmk",
                "command": "bash",
                "args": [
                        "-c",
                        "latexmk -synctex=1 -interaction=nonstopmode -file-line-error -pdf -outdir=\"`cygpath \"%OUTDIR%\"`\" \"`cygpath -u \"%DOC%\"`\" | sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g' && (gunzip -kf %DOCFILE%.synctex.gz && sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g;s#/#\\\\\\\\#g' <%DOCFILE%.synctex | gzip -c - >%DOCFILE%.synctex.gz ; rm -f %DOCFILE%.synctex)"
                ],
                "env": {}
        },
        {
                "name": "lualatexmk",
                "command": "bash",
                "args": [
                        "-c",
                        "latexmk -synctex=1 -interaction=nonstopmode -file-line-error -lualatex -outdir=\"`cygpath \"%OUTDIR%\"`\" \"`cygpath -u \"%DOC%\"`\" | sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g' && (gunzip -kf %DOCFILE%.synctex.gz && sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g;s#/#\\\\\\\\#g' <%DOCFILE%.synctex | gzip -c - >%DOCFILE%.synctex.gz ; rm -f %DOCFILE%.synctex)"
                ],
                "env": {}
        },
        {
                "name": "latexmk_rconly",
                "command": "latexmk",
                "args": [
                        "%DOC%"
                ],
                "env": {}
        },
        {
                "name": "pdflatex",
                "command": "bash",
                "args": [
                        "-c",
                        "pdflatex -synctex=1 -interaction=nonstopmode -file-line-error -output-directory=\"`cygpath \"%OUTDIR%\"`\" \"`cygpath -u \"%DOC%\"`\" | sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g' && (gunzip -kf %DOCFILE%.synctex.gz && sed 's#/cygdrive/\\([a-zA-Z]\\)/#\\1:/#g;s#/#\\\\\\\\#g' <%DOCFILE%.synctex | gzip -c - >%DOCFILE%.synctex.gz ; rm -f %DOCFILE%.synctex)"
                ],
                "env": {}
        },
        {
                "name": "bibtex",
                "command": "bibtex",
                "args": [
                        "%DOCFILE%"
                ],
                "env": {}
        },
        {
                "name": "rnw2tex",
                "command": "Rscript",
                "args": [
                        "-e",
                        "knitr::opts_knit$set(concordance = TRUE); knitr::knit('%DOCFILE_EXT%')"
                ],
                "env": {}
        },
        {
                "name": "jnw2tex",
                "command": "julia",
                "args": [
                        "-e",
                        "using Weave; weave(\"%DOC_EXT%\", doctype=\"tex\")"
                ],
                "env": {}
        },
        {
                "name": "jnw2texmintex",
                "command": "julia",
                "args": [
                        "-e",
                        "using Weave; weave(\"%DOC_EXT%\", doctype=\"texminted\")"
                ],
                "env": {}
        },
        {
                "name": "tectonic",
                "command": "tectonic",
                "args": [
                        "--synctex",
                        "--keep-logs",
                        "%DOC%.tex"
                ],
                "env": {}
        }
    ],
    "latex-workshop.latex.clean.command": "bash",
    "latex-workshop.latex.clean.args": [
      "-c",
      "latexmk -outdir=\"`cygpath \"%OUTDIR%\"`\" -c \"`cygpath -u \"%TEX%\"`\"",
    ],