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Dockerfile

@@ -1,19 +1,36 @@
-# read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
-FROM ubuntu:kinetic
+FROM openanalytics/r-ver:4.1.3
 
-# Doesn't usually have an "upgrade"
-RUN apt-get update \
- && DEBIAN_FRONTEND=noninteractive \
-    apt-get install --no-install-recommends --assume-yes \
-	  build-essential \
-      python3 \
-	  python3-dev \
-      python3-pip
+LABEL maintainer="Tobias Verbeke <tobias.verbeke@openanalytics.eu>"
 
-RUN pip install -r shiny
+# system libraries of general use
+RUN apt-get update && apt-get install --no-install-recommends -y \
+    pandoc \
+    pandoc-citeproc \
+    libcurl4-gnutls-dev \
+    libcairo2-dev \
+    libxt-dev \
+    libssl-dev \
+    libssh2-1-dev \
+    libssl1.1 \
+    && rm -rf /var/lib/apt/lists/*
 
-ENTRYPOINT ["/bin/sh", "-c"]
+# system library dependency for the euler app
+RUN apt-get update && apt-get install -y \
+    libmpfr-dev \
+    && rm -rf /var/lib/apt/lists/*
 
-EXPOSE 7860
+# basic shiny functionality
+RUN R -q -e "install.packages(c('shiny', 'rmarkdown'))"
 
-CMD ["shiny run --port 7860 --host 0.0.0.0"]
+# install dependencies of the euler app
+RUN R -q -e "install.packages('Rmpfr')"
+
+# copy the app to the image
+RUN mkdir /root/euler
+COPY euler /root/euler
+
+COPY Rprofile.site /usr/local/lib/R/etc/
+
+EXPOSE 3838
+
+CMD ["R", "-q", "-e", "shiny::runApp('/root/euler')"]

Rprofile.site

@@ -0,0 +1,3 @@
+local({
+   options(shiny.port = 3838, shiny.host = "0.0.0.0")
+})

euler/server.R

@@ -0,0 +1,20 @@
+library(shiny)
+library(Rmpfr)
+
+
+shinyServer(function(input, output){
+      
+ 
+      output$result <- renderText({
+            
+            precisionBits <- input$precision
+            one <- mpfr(1, precBits = precisionBits) 
+            e <- exp(one)
+            # TODO fix printing...
+            x <- capture.output(print(e, ndigits = precisionBits))[2]
+            gsub("^\\[1\\] (.+)$", "\\1", x)
+            
+            
+          })
+      
+    })

euler/ui.R

@@ -0,0 +1,19 @@
+library(shiny)
+
+shinyUI(
+    fluidPage(
+        titlePanel("Euler's e in arbitrary precision", "Euler's e"),
+        tags$br(),
+        
+        fluidRow(
+            column(2, sliderInput("precision", "Number of Precision Bits", min = 2, max = 256, 
+                    value = 10))
+        ),
+        fluidRow(
+            column(12, tags$h1(textOutput("result")))
+            
+        ),
+        tags$br(),
+        tags$p("We would like to acknowledge Leonhard Euler for his number and Martin Maechler for his Rmpfr package.")
+    )
+)