image file resolver in Lua?

image file resolver in Lua?

[Henning Hraban Ramm]

Ahoi,

I’m using a Lua function to calculate image sizes, cropping etc.
This snippet:

local filename = figures.current().status.fullname
local pic = img.scan{filename = filename}

... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing.
So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension.
How can I address the same file path resolver in my Lua function?


Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD

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Re: image file resolver in Lua?

[Rudolf Bahr]

On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:
> Ahoi,
> 
> I’m using a Lua function to calculate image sizes, cropping etc.
> This snippet:
> 
> local filename = figures.current().status.fullname
> local pic = img.scan{filename = filename}
> 
> ... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing.
> So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension.
> How can I address the same file path resolver in my Lua function?
> 

Moin, Hraban,

where could I find something about those lua functions?

Regards, Rudolf

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Re: image file resolver in Lua?

[Henning Hraban Ramm]

[-- Attachment #1: Type: text/plain, Size: 2832 bytes --]

Am 2018-02-02 um 12:08 schrieb Rudolf Bahr <quasi@quasi.de>:

> On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:
>> Ahoi,
>> 
>> I’m using a Lua function to calculate image sizes, cropping etc.
>> This snippet:
>> 
>> local filename = figures.current().status.fullname
>> local pic = img.scan{filename = filename}
>> 
>> ... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing.
>> So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension.
>> How can I address the same file path resolver in my Lua function?
>> 
> 
> Moin, Hraban,
> 
> where could I find something about those lua functions?

Maybe here: http://source.contextgarden.net/tex/context/base/mkiv/grph-inc.lua

The image placement functions I’m using are something Hans and others helped me accomplish during the last meeting; AFAIK there’s no real documentation.

Find attached the lua part. It’s probably more complicated than necessary


I could work around my original problem: I’m using my image with \externalfigure in an invisible place first, so it’s current, and figures.current().status is the right one. :)

Here’s my (convoluted) placement macro:

% image on empty page, caption in margin
% usage:
% \startpostponing[pagenumber]
% \pagefig[reference]{caption}{filename}
% \stoppostponing
% postponing is important, otherwise the page numbering gets wrong
\def\pagefig{\dosingleempty\doPagefig}
\def\doPagefig[#1]#2#3{
% calculate image size
\startfullpagemakeup
  \externalfigure[#3][width=1mm] % dummy to set image as current
  \def\myClipHeight{\ctxlua{ctxClipHeight("#3", \Resolution)}}
  \def\mystartY{\ctxlua{ctxStartY("#3", \Resolution)}}
  % image
  \setlayerframed[bglayer][%
    frame=off,
    offset=overlay,
    x=21mm,
    y=\mystartY,
    height=\myClipHeight,
    width=\textwidth,
    align=flushleft,
    ]{%
    \clip[
      width=\textwidth,
      height=\myClipHeight,
      hoffset=0mm,
      voffset=0mm, % i.e. clip bottom! TODO: options!
      ]{\externalfigure[#3][width=\textwidth]}
	}
  \textreference[pre#1]{\myImgHeight}
  % caption
  \setlayerframed[bglayer][%
  frame=off,
  offset=overlay,
  linecorrection=on,
  x=143mm,y=\dimexpr\mystartY + 3pt\relax,
  height=\myClipHeight,
  width=\outermarginwidth,
  align={flushleft,low},
  valign=bottom,
  ]{%
  \vbox{
    \textreference[#1]{\strut #2}\vfill #2
  }}
\stopfullpagemakeup
}


usage example:

\startpostponing[82]
\pagefig[alinari-stelzen]{Gebrüder Alinari (Florenz, 19. Jhd.)}{ka34/img/Gebr-Alinari_Kinder_auf_Stelzen}
\stoppostponing



Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD


[-- Attachment #2: grph-imagesize.lua --]
[-- Type: application/octet-stream, Size: 2592 bytes --]

TEXpt = 65536 -- sp per pt
TEXptpi = 72.27 -- pt per inch

function sp2mm(n)
	-- convert sp into mm
	return math.floor(n * 35.28 / TEXpt)/100
end

function glue2num(glue)
	-- convert TeX glue (e.g. skips) into dimensions(? or numbers)
	return glue.width + (glue.stretch * glue.stretch_order) - (glue.shrink * glue.shrink_order)
end

function getImgHeight(filename, resolution)
  -- filename, target resolution [dpi]
  -- filename is not used ATM, just current image
  print("LUA getRegImgHeight(" .. filename .. ", " .. resolution .. ")")
  local targetwidth = tex.getdimen("textwidth")
	filename = figures.current().status.fullname
	local pic = img.scan{filename = filename}
	local picH = pic.ysize * TEXptpi * TEXpt / resolution  -- picture height in sp
	local picW = pic.xsize * TEXptpi * TEXpt / resolution  -- picture width in sp
	print("LUA picH: " .. picH .. " / ysize: " .. pic.ysize)

	local scaling = targetwidth / picW  -- scaling factor
	picH = picH * scaling  -- scaled image height

  return picH
end

function ctxImgHeight(filename, resolution)
  context(getImgHeight(filename, resolution) .. "sp")
end

function getClipHeight(picH)
  -- image should sit on a grid line and occupy n whole lines plus
  -- 2/3 of a line to "start" with middle length of type
  local lineH = tex.getdimen("lineheight")
  local picLY = math.floor(picH / lineH)  --  image height in whole lines
  local clipY = lineH * picLY -- clipped image height
  local picTop = picH % lineH  --  rest of image height
  local firstSkip = 2/3 * lineH -- first line
  if picTop >= firstSkip then
    clipY = clipY + firstSkip -- add first line
  else
    clipY = clipY - (1/2 * lineH) -- clip to first line
  end
  --context(clipY .. "sp")
  return clipY
end

function ctxClipHeight(filename, resolution)
  context(getClipHeight(getImgHeight(filename, resolution)) .. "sp")
end

function getStartY(picH)
  -- I need an absolute y coordinate for image placement
  local Ycorr = 2 * TEXpt -- y correction
  local topOffset = tex.getdimen("topspace") + tex.getdimen("headerheight") + tex.getdimen("headerdistance") + tex.getdimen("topdistance")
	local topskip = glue2num(tex.topskip)
  local textH = tex.getdimen("textheight")
  local lineH = tex.getdimen("lineheight")
  local skipH = (textH - picH) / 3 -- spread space 2:3
  local skipL = math.floor(skipH / lineH)
  skipH = skipL * lineH + 1/3 * lineH -- within type area
  skipH = skipH + topOffset + topskip + Ycorr
  return skipH
end

function ctxStartY(filename, resolution)
  context(getStartY(getClipHeight(getImgHeight(filename, resolution))) .. "sp")
end

[-- Attachment #3: Type: text/plain, Size: 492 bytes --]

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Re: image file resolver in Lua?

[Rudolf Bahr]

On Fri, Feb 02, 2018 at 04:17:32PM +0100, Henning Hraban Ramm wrote:
> Am 2018-02-02 um 12:08 schrieb Rudolf Bahr <quasi@quasi.de>:
> 
> > On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:
> >> Ahoi,
> >> 
> >> I’m using a Lua function to calculate image sizes, cropping etc.
> >> This snippet:
> >> 
> >> local filename = figures.current().status.fullname
> >> local pic = img.scan{filename = filename}
> >> 
> >> ... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing.
> >> So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension.
> >> How can I address the same file path resolver in my Lua function?
> >> 
> > 
> > Moin, Hraban,
> > 
> > where could I find something about those lua functions?
> 
> Maybe here: http://source.contextgarden.net/tex/context/base/mkiv/grph-inc.lua
> 
> The image placement functions I’m using are something Hans and others helped me accomplish during the last meeting; AFAIK there’s no real documentation.
> 
> Find attached the lua part. It’s probably more complicated than necessary
> 
> 
> I could work around my original problem: I’m using my image with \externalfigure in an invisible place first, so it’s current, and figures.current().status is the right one. :)
> 
> Here’s my (convoluted) placement macro:
> 
> % image on empty page, caption in margin
> % usage:
> % \startpostponing[pagenumber]
> % \pagefig[reference]{caption}{filename}
> % \stoppostponing
> % postponing is important, otherwise the page numbering gets wrong
> \def\pagefig{\dosingleempty\doPagefig}
> \def\doPagefig[#1]#2#3{
> % calculate image size
> \startfullpagemakeup
>   \externalfigure[#3][width=1mm] % dummy to set image as current
>   \def\myClipHeight{\ctxlua{ctxClipHeight("#3", \Resolution)}}
>   \def\mystartY{\ctxlua{ctxStartY("#3", \Resolution)}}
>   % image
>   \setlayerframed[bglayer][%
>     frame=off,
>     offset=overlay,
>     x=21mm,
>     y=\mystartY,
>     height=\myClipHeight,
>     width=\textwidth,
>     align=flushleft,
>     ]{%
>     \clip[
>       width=\textwidth,
>       height=\myClipHeight,
>       hoffset=0mm,
>       voffset=0mm, % i.e. clip bottom! TODO: options!
>       ]{\externalfigure[#3][width=\textwidth]}
> 	}
>   \textreference[pre#1]{\myImgHeight}
>   % caption
>   \setlayerframed[bglayer][%
>   frame=off,
>   offset=overlay,
>   linecorrection=on,
>   x=143mm,y=\dimexpr\mystartY + 3pt\relax,
>   height=\myClipHeight,
>   width=\outermarginwidth,
>   align={flushleft,low},
>   valign=bottom,
>   ]{%
>   \vbox{
>     \textreference[#1]{\strut #2}\vfill #2
>   }}
> \stopfullpagemakeup
> }
> 
> 
> usage example:
> 
> \startpostponing[82]
> \pagefig[alinari-stelzen]{Gebrüder Alinari (Florenz, 19. Jhd.)}{ka34/img/Gebr-Alinari_Kinder_auf_Stelzen}
> \stoppostponing
> 
> 
> 
> Greetlings, Hraban
> ---
> http://www.fiee.net
> http://wiki.contextgarden.net
> GPG Key ID 1C9B22FD
> 

Moin Hraban!

It's very interesting for me to see, how exactly you calculate 
the size of images and texts with the help of lua! 

Up to now I used to use python and a independend lua to provide some 
necessary data for context. For instance python invokes graphicsmagick 
in order to get the size of images. Because it's provided in px and not 
in pt, so often some further manual work is unavoidable.

Now, since lua and metafun are well integrated into context it suggests
itself to use luatex instead of python, though I like this language
very much.

Thank you very much, Hraban, for putting your macros and links 
at my disposal!

Regards, Rudolf

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: image file resolver in Lua?

[Hans Hagen]

On 2/3/2018 7:57 AM, Rudolf Bahr wrote:
> On Fri, Feb 02, 2018 at 04:17:32PM +0100, Henning Hraban Ramm wrote:
>> Am 2018-02-02 um 12:08 schrieb Rudolf Bahr <quasi@quasi.de>:
>>
>>> On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:
>>>> Ahoi,
>>>>
>>>> I’m using a Lua function to calculate image sizes, cropping etc.
>>>> This snippet:
>>>>
>>>> local filename = figures.current().status.fullname
>>>> local pic = img.scan{filename = filename}
>>>>
>>>> ... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing.
>>>> So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension.
>>>> How can I address the same file path resolver in my Lua function?
>>>>
>>>
>>> Moin, Hraban,
>>>
>>> where could I find something about those lua functions?
>>
>> Maybe here: http://source.contextgarden.net/tex/context/base/mkiv/grph-inc.lua
>>
>> The image placement functions I’m using are something Hans and others helped me accomplish during the last meeting; AFAIK there’s no real documentation.
>>
>> Find attached the lua part. It’s probably more complicated than necessary
>>
>>
>> I could work around my original problem: I’m using my image with \externalfigure in an invisible place first, so it’s current, and figures.current().status is the right one. :)
>>
>> Here’s my (convoluted) placement macro:
>>
>> % image on empty page, caption in margin
>> % usage:
>> % \startpostponing[pagenumber]
>> % \pagefig[reference]{caption}{filename}
>> % \stoppostponing
>> % postponing is important, otherwise the page numbering gets wrong
>> \def\pagefig{\dosingleempty\doPagefig}
>> \def\doPagefig[#1]#2#3{
>> % calculate image size
>> \startfullpagemakeup
>>    \externalfigure[#3][width=1mm] % dummy to set image as current
>>    \def\myClipHeight{\ctxlua{ctxClipHeight("#3", \Resolution)}}
>>    \def\mystartY{\ctxlua{ctxStartY("#3", \Resolution)}}
>>    % image
>>    \setlayerframed[bglayer][%
>>      frame=off,
>>      offset=overlay,
>>      x=21mm,
>>      y=\mystartY,
>>      height=\myClipHeight,
>>      width=\textwidth,
>>      align=flushleft,
>>      ]{%
>>      \clip[
>>        width=\textwidth,
>>        height=\myClipHeight,
>>        hoffset=0mm,
>>        voffset=0mm, % i.e. clip bottom! TODO: options!
>>        ]{\externalfigure[#3][width=\textwidth]}
>> 	}
>>    \textreference[pre#1]{\myImgHeight}
>>    % caption
>>    \setlayerframed[bglayer][%
>>    frame=off,
>>    offset=overlay,
>>    linecorrection=on,
>>    x=143mm,y=\dimexpr\mystartY + 3pt\relax,
>>    height=\myClipHeight,
>>    width=\outermarginwidth,
>>    align={flushleft,low},
>>    valign=bottom,
>>    ]{%
>>    \vbox{
>>      \textreference[#1]{\strut #2}\vfill #2
>>    }}
>> \stopfullpagemakeup
>> }
>>
>>
>> usage example:
>>
>> \startpostponing[82]
>> \pagefig[alinari-stelzen]{Gebrüder Alinari (Florenz, 19. Jhd.)}{ka34/img/Gebr-Alinari_Kinder_auf_Stelzen}
>> \stoppostponing
>>
>>
>>
>> Greetlings, Hraban
>> ---
>> http://www.fiee.net
>> http://wiki.contextgarden.net
>> GPG Key ID 1C9B22FD
>>
> 
> Moin Hraban!
> 
> It's very interesting for me to see, how exactly you calculate
> the size of images and texts with the help of lua!
> 
> Up to now I used to use python and a independend lua to provide some
> necessary data for context. For instance python invokes graphicsmagick
> in order to get the size of images. Because it's provided in px and not
> in pt, so often some further manual work is unavoidable.
> 
> Now, since lua and metafun are well integrated into context it suggests
> itself to use luatex instead of python, though I like this language
> very much.
> 
> Thank you very much, Hraban, for putting your macros and links
> at my disposal!
Not sure what you want top know but a lot of image properties can be 
checked by prerolling:

\starttext

\getfiguredimensions[t:/sources/cow.pdf]

\starttabulate[|T|T|]
\NC \string\figurewidth         \NC \figurewidth         \NC \NR
\NC \string\figureheight        \NC \figureheight        \NC \NR
\NC \string\figurexscale        \NC \figurexscale        \NC \NR
\NC \string\figureyscale        \NC \figureyscale        \NC \NR
\TB
\NC \string\figuresize          \NC \figuresize          \NC \NR
\NC \string\figurelabel         \NC \figurelabel         \NC \NR
\NC \string\figurefileoriginal  \NC \figurefileoriginal  \NC \NR
\NC \string\figurefilepage      \NC \figurefilepage      \NC \NR
\NC \string\figurefileoptions   \NC \figurefileoptions   \NC \NR
\NC \string\figurefileconversion\NC \figurefileconversion\NC \NR
\NC \string\figurefileresolution\NC \figurefileresolution\NC \NR
\NC \string\figurefilecolor     \NC \figurefilecolor     \NC \NR
\NC \string\figurefilearguments \NC \figurefilearguments \NC \NR
\NC \string\figurefilecache     \NC \figurefilecache     \NC \NR
\NC \string\figurefileprefix    \NC \figurefileprefix    \NC \NR
\TB
\NC \string\figurenaturalwidth  \NC \figurenaturalwidth  \NC \NR
\NC \string\figurenaturalheight \NC \figurenaturalheight \NC \NR
\NC \string\figurexresolution   \NC \figurexresolution   \NC \NR
\NC \string\figureyresolution   \NC \figureyresolution   \NC \NR
\NC \string\figureorientation   \NC \figureorientation   \NC \NR
\NC \string\figurerotation      \NC \figurerotation      \NC \NR
\NC \string\figurexsize         \NC \figurexsize         \NC \NR
\NC \string\figureysize         \NC \figureysize         \NC \NR
\NC \string\figurecolordepth    \NC \figurecolordepth    \NC \NR
\NC \string\figuredepth         \NC \figuredepth         \NC \NR
\TB
\NC \string\figurefullname      \NC \figurefullname      \NC \NR
\NC \string\noffigurepages      \NC \noffigurepages      \NC \NR
\TB
\NC \string\figurefilepath      \NC \figurefilepath      \NC \NR
\NC \string\figurefilename      \NC \figurefilename      \NC \NR
\NC \string\figurefiletype      \NC \figurefiletype      \NC \NR
\stoptabulate

\stoptext




-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: image file resolver in Lua?

[Henning Hraban Ramm]

Am 2018-02-04 um 13:06 schrieb Hans Hagen <pragma@wxs.nl>:

> Not sure what you want top know but a lot of image properties can be checked by prerolling:
> \getfiguredimensions[t:/sources/cow.pdf]

This is really interesting, but my original question was about the file path resolver, i.e. how to get "t:/sources/cow.pdf" from just "cow"?


Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD

___________________________________________________________________________________
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___________________________________________________________________________________

Re: image file resolver in Lua?

[Rudolf Bahr]

On Sun, Feb 04, 2018 at 01:06:08PM +0100, Hans Hagen wrote:
> On 2/3/2018 7:57 AM, Rudolf Bahr wrote:
> > On Fri, Feb 02, 2018 at 04:17:32PM +0100, Henning Hraban Ramm wrote:
> > > Am 2018-02-02 um 12:08 schrieb Rudolf Bahr <quasi@quasi.de>:
> > > 
> > > > On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:
> > > > > Ahoi,
> > > > > 
> > > > > I’m using a Lua function to calculate image sizes, cropping etc.
> > > > > This snippet:
> > > > > 
> > > > > local filename = figures.current().status.fullname
> > > > > local pic = img.scan{filename = filename}
> > > > > 
> > > > > ... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing.
> > > > > So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension.
> > > > > How can I address the same file path resolver in my Lua function?
> > > > > 
> > > > 
> > > > Moin, Hraban,
> > > > 
> > > > where could I find something about those lua functions?
> > > 
> > > Maybe here: http://source.contextgarden.net/tex/context/base/mkiv/grph-inc.lua
> > > 
> > > The image placement functions I’m using are something Hans and others helped me accomplish during the last meeting; AFAIK there’s no real documentation.
> > > 
> > > Find attached the lua part. It’s probably more complicated than necessary
> > > 
> > > 
> > > I could work around my original problem: I’m using my image with \externalfigure in an invisible place first, so it’s current, and figures.current().status is the right one. :)
> > > 
> > > Here’s my (convoluted) placement macro:
> > > 
> > > % image on empty page, caption in margin
> > > % usage:
> > > % \startpostponing[pagenumber]
> > > % \pagefig[reference]{caption}{filename}
> > > % \stoppostponing
> > > % postponing is important, otherwise the page numbering gets wrong
> > > \def\pagefig{\dosingleempty\doPagefig}
> > > \def\doPagefig[#1]#2#3{
> > > % calculate image size
> > > \startfullpagemakeup
> > >    \externalfigure[#3][width=1mm] % dummy to set image as current
> > >    \def\myClipHeight{\ctxlua{ctxClipHeight("#3", \Resolution)}}
> > >    \def\mystartY{\ctxlua{ctxStartY("#3", \Resolution)}}
> > >    % image
> > >    \setlayerframed[bglayer][%
> > >      frame=off,
> > >      offset=overlay,
> > >      x=21mm,
> > >      y=\mystartY,
> > >      height=\myClipHeight,
> > >      width=\textwidth,
> > >      align=flushleft,
> > >      ]{%
> > >      \clip[
> > >        width=\textwidth,
> > >        height=\myClipHeight,
> > >        hoffset=0mm,
> > >        voffset=0mm, % i.e. clip bottom! TODO: options!
> > >        ]{\externalfigure[#3][width=\textwidth]}
> > > 	}
> > >    \textreference[pre#1]{\myImgHeight}
> > >    % caption
> > >    \setlayerframed[bglayer][%
> > >    frame=off,
> > >    offset=overlay,
> > >    linecorrection=on,
> > >    x=143mm,y=\dimexpr\mystartY + 3pt\relax,
> > >    height=\myClipHeight,
> > >    width=\outermarginwidth,
> > >    align={flushleft,low},
> > >    valign=bottom,
> > >    ]{%
> > >    \vbox{
> > >      \textreference[#1]{\strut #2}\vfill #2
> > >    }}
> > > \stopfullpagemakeup
> > > }
> > > 
> > > 
> > > usage example:
> > > 
> > > \startpostponing[82]
> > > \pagefig[alinari-stelzen]{Gebrüder Alinari (Florenz, 19. Jhd.)}{ka34/img/Gebr-Alinari_Kinder_auf_Stelzen}
> > > \stoppostponing
> > > 
> > > 
> > > 
> > > Greetlings, Hraban
> > > ---
> > > http://www.fiee.net
> > > http://wiki.contextgarden.net
> > > GPG Key ID 1C9B22FD
> > > 
> > 
> > Moin Hraban!
> > 
> > It's very interesting for me to see, how exactly you calculate
> > the size of images and texts with the help of lua!
> > 
> > Up to now I used to use python and a independend lua to provide some
> > necessary data for context. For instance python invokes graphicsmagick
> > in order to get the size of images. Because it's provided in px and not
> > in pt, so often some further manual work is unavoidable.
> > 
> > Now, since lua and metafun are well integrated into context it suggests
> > itself to use luatex instead of python, though I like this language
> > very much.
> > 
> > Thank you very much, Hraban, for putting your macros and links
> > at my disposal!
> Not sure what you want top know but a lot of image properties can be checked
> by prerolling:
> 
> \starttext
> 
> \getfiguredimensions[t:/sources/cow.pdf]
> 
> \starttabulate[|T|T|]
> \NC \string\figurewidth         \NC \figurewidth         \NC \NR
> \NC \string\figureheight        \NC \figureheight        \NC \NR
> \NC \string\figurexscale        \NC \figurexscale        \NC \NR
> \NC \string\figureyscale        \NC \figureyscale        \NC \NR
> \TB
> \NC \string\figuresize          \NC \figuresize          \NC \NR
> \NC \string\figurelabel         \NC \figurelabel         \NC \NR
> \NC \string\figurefileoriginal  \NC \figurefileoriginal  \NC \NR
> \NC \string\figurefilepage      \NC \figurefilepage      \NC \NR
> \NC \string\figurefileoptions   \NC \figurefileoptions   \NC \NR
> \NC \string\figurefileconversion\NC \figurefileconversion\NC \NR
> \NC \string\figurefileresolution\NC \figurefileresolution\NC \NR
> \NC \string\figurefilecolor     \NC \figurefilecolor     \NC \NR
> \NC \string\figurefilearguments \NC \figurefilearguments \NC \NR
> \NC \string\figurefilecache     \NC \figurefilecache     \NC \NR
> \NC \string\figurefileprefix    \NC \figurefileprefix    \NC \NR
> \TB
> \NC \string\figurenaturalwidth  \NC \figurenaturalwidth  \NC \NR
> \NC \string\figurenaturalheight \NC \figurenaturalheight \NC \NR
> \NC \string\figurexresolution   \NC \figurexresolution   \NC \NR
> \NC \string\figureyresolution   \NC \figureyresolution   \NC \NR
> \NC \string\figureorientation   \NC \figureorientation   \NC \NR
> \NC \string\figurerotation      \NC \figurerotation      \NC \NR
> \NC \string\figurexsize         \NC \figurexsize         \NC \NR
> \NC \string\figureysize         \NC \figureysize         \NC \NR
> \NC \string\figurecolordepth    \NC \figurecolordepth    \NC \NR
> \NC \string\figuredepth         \NC \figuredepth         \NC \NR
> \TB
> \NC \string\figurefullname      \NC \figurefullname      \NC \NR
> \NC \string\noffigurepages      \NC \noffigurepages      \NC \NR
> \TB
> \NC \string\figurefilepath      \NC \figurefilepath      \NC \NR
> \NC \string\figurefilename      \NC \figurefilename      \NC \NR
> \NC \string\figurefiletype      \NC \figurefiletype      \NC \NR
> \stoptabulate
> 
> \stoptext
> 
> 

This is very good and useful, thank you, Hans!

I need this to set a bunch of family history books with plenty of 
photos, texts, family trees, journey diaries, scans, index of persons etc. 
With the help of context+luatex+metafun I'd like to set the pages hopefully 
without the need of too much manual corrections, i.e in a as far as possible 
automated way. There is a lot of material, especially nowadays the 
flood of digital pictures. At the moment I succeed in setting only 2 or 3
such year-books per year.

Thanks again for your help,

Rudolf

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Re: image file resolver in Lua?

[Pablo Rodriguez]

On 02/04/2018 07:04 PM, Henning Hraban Ramm wrote:
> Am 2018-02-04 um 13:06 schrieb Hans Hagen <pragma@wxs.nl>:
> 
>> Not sure what you want top know but a lot of image properties can be checked by prerolling:
>> \getfiguredimensions[t:/sources/cow.pdf]
> 
> This is really interesting, but my original question was about the
> file path resolver, i.e. how to get "t:/sources/cow.pdf" from just "cow"?

Hi Hraban,

in case your question remains unanswered (which isn’t clear to me):

    \setupexternalfigures[location=default]
    \starttext

    \getfiguredimensions[cow.pdf]

    \starttabulate[|T|T|]
    \NC \string\figurefullname      \NC \figurefullname      \NC \NR
    \NC \string\figurefilepath      \NC \figurefilepath      \NC \NR
    \NC \string\figurefilename      \NC \figurefilename      \NC \NR
    \NC \string\figurefiletype      \NC \figurefiletype      \NC \NR
    \stoptabulate
    \stoptext

Just in case it helps,

Pablo
-- 
http://www.ousia.tk
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Re: image file resolver in Lua?

[Procházka Lukáš Ing.]

Hello Henning,

> This is really interesting, but my original question was about the file path resolver, i.e. how to get "t:/sources/cow.pdf" from just "cow"?
>

I guess there was a similar question here:

	https://mailman.ntg.nl/pipermail/ntg-context/2017/088324.html

Reading till the end, I deduce one has to collect snippets which appear in the code to build its own "file locator" as no function like "MyExternalFigureLocator()" exists in ConTeXt/Lua API.

Some highlights:

----
> Personally I use the lua variable named : figures.path
>
> It’s a lua table which contains directories names you provide in directory= in \setupexternalfigures:
>
> for _, path in ipairs(figures.paths) do
>      local figure_file = path .. '/' .. file
>       local doc = lpdf.epdf.load(figure_file)  -- assume pdf (just an example)
>      if doc then
>           ….
>      end
> done
----

Unfortunately, this code supposes the figure name was passed WITH extension, as no lookup in table-of-valid-extensions is performed (maybe no such table nor iterator exists).


There should be also:

----
local n = "x:/Users/MMi/Akce/I-6_Krusovice.DSP-ZDS/Admin/Jednani/2017-07-07-SU-Rakovnik/ZJ.pdf"
local d = figures.getinfo(n)

inspect(d)
----

And a snippet from another mailing thread:

---- (Hans' answer)
\getfiguredimensions[test.pdf]
\dorecurse {\noffigurepages} {
      \getfiguredimensions[test.pdf][page=#1]
      \figurenaturalwidth
,\figurenaturalheight,\figureorientation,\figurerotation\par
}

in lua you can either use the img library (see luatex manual) or context
helpers

          local data = figures.push("foo.pdf")
          figures.identify()
          figures.check()
          figures.pop()
	inspect(data)

i'll add:

function figures.getinfo(name,page)
      if type(name) == "string" then
          name = { name = name, page = page }
      end
      if name.name then
          local data = figures.push(name)
          figures.identify()
          figures.check()
          figures.pop()
          return data
      end
end

so that one can do

local n = "ms.pdf"
local d = figures.getinfo(n)

if d then
      for i=1,d.used.pages do
          local p = figures.getinfo(n,i)
          if p then
              local u = p.used
              print(u.width,u.height,u.orientation)
          end
      end
end
----

Hope this helps.

Best regards,

Lukas


On Sun, 04 Feb 2018 19:04:28 +0100, Henning Hraban Ramm <texml@fiee.net> wrote:

>
> Greetlings, Hraban
> ---
> http://www.fiee.net
> http://wiki.contextgarden.net
> GPG Key ID 1C9B22FD
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


-- 
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
Bezová 1658
147 14 Praha 4

Mob.: +420 702 033 396

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___________________________________________________________________________________

Re: image file resolver in Lua?

[Henning Hraban Ramm]

Am 2018-02-06 um 09:34 schrieb Procházka Lukáš Ing. <LPr@pontex.cz>:

> Hello Henning,
> 
>> This is really interesting, but my original question was about the file path resolver, i.e. how to get "t:/sources/cow.pdf" from just "cow"?
>> 
> 
> I guess there was a similar question here:
> 
> 	https://mailman.ntg.nl/pipermail/ntg-context/2017/088324.html
> 
> Reading till the end, I deduce one has to collect snippets which appear in the code to build its own "file locator" as no function like "MyExternalFigureLocator()" exists in ConTeXt/Lua API.

Dear Lukáš,
thank you very much for collecting this information!

I’ll try as soon as I get some time, since algorithmic image placement is a recurring problem for me, as I try to replace InDesign in my workflow.

I thought about providing a module, but each of my projects has so differing needs that either every macro would need a bunch of options, or I need a lot of similar macros. We’ll see...

Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD

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___________________________________________________________________________________

Re: image file resolver in Lua?

[Procházka Lukáš Ing.]

Hello Henning,

On Tue, 06 Feb 2018 13:13:12 +0100, Henning Hraban Ramm <texml@fiee.net> wrote:

> I’ll try as soon as I get some time, since algorithmic image placement is a recurring problem for me, as I try to replace InDesign in my workflow.
>
> I thought about providing a module, but each of my projects has so differing needs that either every macro would need a bunch of options, or I need a lot of similar macros. We’ll see...
>

my experience in these situations:

I'm usually implementing complicated solutions via Lua, with functions with obligatory arg(s) first followed by one optional argument of table type:

- it's  easy to investigate this optional argument and alter the algorithm depending on table keys (presence and/or value),
- you don't have to be afraid of optional arg(s) rearrangement.

To be more concrete:

---- Sample Lua code

MyPlaceFigure = function(figname,
                          opts) -- Optional; .scale = .sc, .rotation = .rot, .label, ...
   opts = opts or {} -- To simplify code bellow

   local scale, rot, lab =
     opts.scale or opts.sc, -- I.e. more keys are allowed in long/short alternative
     opts.rotation or opts.rotate or opts.rot, -- dtto
     opts.label or opts.lab,
     nil

   if label then
     -- E.g. use context.placefloat(...)
   else
     context.externalfigure({figname}, {scale = 1000 * scale, orientation = rot, })
   end
end

----

Best regards,

Lukas


> Greetlings, Hraban


-- 
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
Bezová 1658
147 14 Praha 4

Mob.: +420 702 033 396

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Re: image file resolver in Lua?

[Henning Hraban Ramm]

Am 2018-02-06 um 17:09 schrieb Procházka Lukáš Ing. <LPr@pontex.cz>:

> I'm usually implementing complicated solutions via Lua, with functions with obligatory arg(s) first followed by one optional argument of table type:

Thank you for your effort!
I actually already wrote parts of my invoicing solution in Lua. I was planning to even run a simple GUI (tekui) on top of LuaTeX, but my priorities keep shifting... At the moment I got shell scripts that call Python scripts that read JSON files (as a simple database) and write ConTeXt code that includes (object oriented) Lua libraries for most of the the calculations...
It works well enough for my own company and our publishing house, but is quite convoluted.

Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD

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Re: image file resolver in Lua?

[Henning Hraban Ramm]

Am 2018-02-04 um 13:06 schrieb Hans Hagen <pragma@wxs.nl>:

> Not sure what you want top know but a lot of image properties can be checked by prerolling:
> 
> \getfiguredimensions[t:/sources/cow.pdf]
...
> \NC \string\figurefilepath      \NC \figurefilepath      \NC \NR
> \NC \string\figurefilename      \NC \figurefilename      \NC \NR
> \NC \string\figurefiletype      \NC \figurefiletype      \NC \NR

Sorry, I didn’t recognize that this also answered my question!
Seems like I can condense my calculations a lot...

I started some documentation here: http://wiki.contextgarden.net/Image_Placement

A few of the variables don’t work:
\figurefileresolution, \figurefilecolor, \figurefilearguments, \figureorientation and \figurerotation all lead to errors.
I checked only in the garden yet, so maybe these are quite new?


Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD

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___________________________________________________________________________________

Re: image file resolver in Lua?

[Henning Hraban Ramm]

Am 2018-02-04 um 13:06 schrieb Hans Hagen <pragma@wxs.nl>:

> \getfiguredimensions[t:/sources/cow.pdf]
> 
> \starttabulate[|T|T|]
> \NC \string\figurewidth         \NC \figurewidth         \NC \NR
> \NC \string\figureheight        \NC \figureheight        \NC \NR
> \NC \string\figurexscale        \NC \figurexscale        \NC \NR
> \NC \string\figureyscale        \NC \figureyscale        \NC \NR
...
> \TB
> \NC \string\figurefullname      \NC \figurefullname      \NC \NR
> \NC \string\noffigurepages      \NC \noffigurepages      \NC \NR
> \TB
> \NC \string\figurefilepath      \NC \figurefilepath      \NC \NR
> \NC \string\figurefilename      \NC \figurefilename      \NC \NR
> \NC \string\figurefiletype      \NC \figurefiletype      \NC \NR
> \stoptabulate

Next try: How can I access these values from Lua?

While \ctxlua{print("\figureheight")} works,
context.figureheight is a function value (?),
context.figureheight() or tex.figureheight() is nil, 
tex.getdimen("figureheight") is also wrong, and it’s also no glue.

I’d be thankful for a hint.


Greetlings, Hraban
---
http://www.fiee.net
http://wiki.contextgarden.net
GPG Key ID 1C9B22FD


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