On 2/27/2017 2:11 PM, Antoine Cailliau wrote:
The following code, from the wiki, results in a compilation error:

    \starttext
    \ctxlua{context(string.format("\%.2f", math.pi))}
    \stoptext

\startluacode
 ...
\stopluacode


but not in macros where the % is normally a comment again


The error is:

    [\directlua]:1: invalid escape sequence near '\%'
    1     \starttext
    2
    3 >>  \ctxlua{context(string.format("\%.2f", math.pi))}
    4
    5     \stoptext


I ended using \letterpercent command but it is not very convenient.

Any help is welcome,

Antoine C.

Full log:

    mtx-context     | warning: synctex is enabled
    mtx-context     | run 1: luatex
    
--fmt="/usr/local/texlive/2015/texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9/formats/luatex/cont-en"
    --jobname="luapercent"
    
--lua="/usr/local/texlive/2015/texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9/formats/luatex/cont-en.lui"
    --no-parse-first-line --synctex=1 --c:autogenerate --c:currentrun=1
    --c:directives="system.synctex=1"
    --c:fulljobname="/Users/acailliau/Desktop/luapercent.tex"
    --c:input="/Users/acailliau/Desktop/luapercent.tex" --c:kindofrun=1
    --c:maxnofruns=9 --c:synctex="1" "cont-yes.mkiv"
    This is LuaTeX, Version beta-0.80.0 (TeX Live 2015) (rev 5238)
     \write18 enabled.
    system          > synctex functionality is enabled (1)!
    open source     > 1 > 1 >
    /usr/local/texlive/2015/texmf-dist/tex/context/base/cont-yes.mkiv
    ConTeXt  ver: 2015.05.18 12:26 MKIV current  fmt: 2016.4.25  int:
    english/english
    system          > 'cont-new.mkiv' loaded
    open source     > 2 > 2 >
    /usr/local/texlive/2015/texmf-dist/tex/context/base/cont-new.mkiv
    close source    > 2 > 2 >
    /usr/local/texlive/2015/texmf-dist/tex/context/base/cont-new.mkiv
    system          > files > jobname 'luapercent', input
    '/Users/acailliau/Desktop/luapercent', result 'luapercent'
    fonts           > latin modern fonts are not preloaded
    languages       > language 'en' is active
    open source     > 2 > 3 > /Users/acailliau/Desktop/luapercent.tex
    fonts           > preloading latin modern fonts (second stage)
    fonts           > 'fallback modern-designsize rm 12pt' is loaded
    lua error       > error on line 3 in file
    /Users/acailliau/Desktop/luapercent.tex:
    [\directlua]:1: invalid escape sequence near '\%'
    1     \starttext
    2
    3 >>  \ctxlua{context(string.format("\%.2f", math.pi))}
    4
    5     \stoptext

    ? Type  to proceed, S to scroll future error messages,
    R to run without stopping, Q to run quietly,
    I to insert something,
    1 or ... or 9 to ignore the next 1 to 9 tokens of input,
    H for help, X to quit.
    ? close source    > 2 > 3 > /Users/acailliau/Desktop/luapercent.tex
    close source    > 1 > 3 >
    /usr/local/texlive/2015/texmf-dist/tex/context/base/cont-yes.mkiv
    mkiv lua stats  > used config file:
    selfautoparent:/texmfcnf.lua;selfautoparent:/texmf-dist/web2c/texmfcnf.lua
    mkiv lua stats  > used cache path:
    
/usr/local/texlive/2015/texmf-var/luatex-cache/context/a86c089b384a3076dc514ba966a1fac9
    mkiv lua stats  > synctex tracing: synctex has been enabled (extra
    log file generated)
    mkiv lua stats  > resource resolver: loadtime 0.117 seconds, 0 scans
    with scantime 0.000 seconds, 0 shared scans, 8 found files, scanned
    paths:
    mkiv lua stats  > stored bytecode data: 371 modules (0.309 sec), 78
    tables (0.008 sec), 449 chunks (0.316 sec)
    mkiv lua stats  > traced context: maxstack: 1132, freed: 0,
    unreachable: 1132
    mkiv lua stats  > running in nuts mode: yes
    mkiv lua stats  > cleaned up reserved nodes: 41 nodes, 439 lists of 438
    mkiv lua stats  > node memory usage: 2 glue, 2 penalty, 6 attribute,
    26 glue_spec, 2 attribute_list, 2 temp
    mkiv lua stats  > node list callback tasks: 6 unique task lists, 2
    instances (re)created, 3 calls
    mkiv lua stats  > used backend: pdf (backend for directly generating
    pdf output)
    mkiv lua stats  > loaded patterns: en::2, load time: 0.000
    mkiv lua stats  > jobdata time: 0.001 seconds saving, 0.000 seconds
    loading
    mkiv lua stats  > callbacks: 60 direct, 243 indirect, 303 total
    mkiv lua stats  > result saved in file: luapercent.pdf,
    compresslevel 3, objectcompresslevel 3
    mkiv lua stats  > loaded fonts: 2 files: latinmodern-math.otf,
    lmroman12-regular.otf
    mkiv lua stats  > fonts load time: 0.180 seconds
    mkiv lua stats  > used platform: osx-64, type: unix, binary subtree: bin
    mkiv lua stats  > luatex banner: this is luatex, version beta-0.80.0
    (tex live 2015) (rev 5238)
    mkiv lua stats  > control sequences: 43101 of 65536 + 100000
    mkiv lua stats  > lua properties: engine: lua, used memory: 67 MB
    (ctx: 66 MB), hash type: lua, hash chars: min(64,40), symbol mask:
    utf (τεχ)
    mkiv lua stats  > runtime: 0.540 seconds
    mtx-context     | fatal error: return code: 1



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