Seems to be looking for files in app developer's home directory

Matthew Sottile

February 22, 2016 08:09

Answered

Trying a simple example with the Graphics.Rendering.Chart package, I see this error:

** Exception: /Users/chak/Library/Developer/Xcode/DerivedData/GHC-dzygcdsfubpixrdbokgtmpvzbjvk/Build/Intermediates/ArchiveIntermediates/GHC/BuildProductsPath/Release/GHCBuild.bundle/Contents/usr/share/ghc-7.10.2-x86_64/Chart-diagrams-1.5.4/fonts/SourceSansPro_R.svg: openFile: does not exist (No such file or directory)

The app appears to be looking for the original developer's home directory for a file, which doesn't exist on my machine. The code was pasted from the examples for the library:

import Graphics.Rendering.Chart.Easy
import Graphics.Rendering.Chart.Backend.Diagrams

signal :: [Double] -> [(Double,Double)]
signal xs = [ (x,(sin (x*3.14159/45) + 1) / 2 * (sin (x*3.14159/5)))
| x <- xs ]

main = toFile def "test.png" $ do
layout_title .= "Amplitude Modulation"
plot (line "am" [signal [0,(0.5)..400]])
plot (points "am points" (signal [0,7..400]))

And appears when I run main from the playground.

Manuel Chakravarty February 22, 2016 23:56 Official comment

Thank you for pointing that out. This is a problem with the `Chart` package (or rather the font management library that it is using), which insists on hardcoding the default source path during package build time. At the moment, I don't know a way around this, but would very much appreciate any suggestions.

However, there is a workaround. You can specify additional fonts and embed them as resources in your project. For an example of this, please have a look the the `Diagrams.hsproj` sample project included with Haskell for Mac. (You get to it as follows: from the "Window" menu, select the "Welcome Window", then select "Getting Started" and the sample projects are in the right.)

If you look at the code of the module `Chart.hs` in `Diagrams.hsproj`, you will find a definition for `chartEnv` at the end of that file. It demonstrates how to add local fonts. You find the local fonts used in the project, in the "Resources" section of the project navigator on the left.

Does that solve the problem for you?

Seems to be looking for files in app developer's home directory

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