On Thu, Dec 6, 2018 at 11:17 AM Procházka Lukáš Ing. wrote:

Hello,

I'm using the following code, mentioned here some time ago, to get some info about PDF:

---- \startluacode figures.getinfo = function(name, page) if type(name) == "string" then name = { name = name, page = page } end if name.name then local data = figures.push(name)

--figures.identify() local ok, res = pcall(figures.identify) print(">>1", ok, res)

--figures.check() local ok, res = pcall(figures.check) print(">>2", ok, res)

figures.pop() return data end end

local data = figures.getinfo("NonExisting.pdf")

\stopluacode ----

The problem is that once the PDF file doesn't exist, the function causes ConTeXt to exit, even when I enclose 'figure.check()' into the 'pcall' (to be handled like try/catch mechanism).

Is there a way so that the function 'figures.getinfo()' does't exit ConTeXt, it just returns 'nil', or even gives info which directories (or even which file types) were searched?

TIA.

something like that (untested), eventaully to be wrapped in a your function local fileone = "NonExisting.pdf" local data if not lfs.isfile(fileone) then report("unknown file %a",fileone) else data = figures.getinfo("NonExisting.pdf") end

-- luigi

Procházka Lukáš Ing. schrieb am 06.12.18 um 11:20:

Hello,

I'm using the following code, mentioned here some time ago, to get some info about PDF:

---- \startluacode figures.getinfo = function(name, page)     if type(name) == "string" then         name = { name = name, page = page }     end     if name.name then         local data = figures.push(name)

        --figures.identify() local ok, res = pcall(figures.identify) print(">>1", ok, res)

        --figures.check() local ok, res = pcall(figures.check) print(">>2", ok, res)

        figures.pop()         return data     end end

local data = figures.getinfo("NonExisting.pdf")

\stopluacode ----

The problem is that once the PDF file doesn't exist, the function causes ConTeXt to exit, even when I enclose 'figure.check()' into the 'pcall' (to be handled like try/catch mechanism).

Is there a way so that the function 'figures.getinfo()' does't exit ConTeXt, it just returns 'nil', or even gives info which directories (or even which file types) were searched?

You can use the \doifelsefigure command for a simple check \setupexternalfigure[location={local,global,default}] \starttext \doifelsefigure{cow}{YES}{NO} \doifelsefigure{mill}{YES}{NO} \doifelsefigure{bridge}{YES}{NO} \stoptext or the following stripped down version of the underlying Lua code of the \doifelsefigure command \setupexternalfigure[location={local,global,default}] \starttext \startluacode local cow = figures.getinfo("cow") if figures.get("status","status",0) == 0 then context("NO") context.par() else context("YES") context.par() end local mill = figures.getinfo("mill") if figures.get("status","status",0) == 0 then context("NO") context.par() else context("YES") context.par() end local bridge = figures.getinfo("bridge") if figures.get("status","status",0) == 0 then context("NO") context.par() else context("YES") context.par() end \stopluacode \stoptext Wolfgang