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Fix(58) installation instructions #59

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Fix(58) installation instructions #59

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4e31928
formatting fix
Aug 9, 2020
7fac900
provide a workaround for #58, include a dockerfile that works
Aug 9, 2020
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13 changes: 12 additions & 1 deletion README.md
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Expand Up @@ -6,7 +6,7 @@ gmapsdistance
![](https://img.shields.io/badge/license-GPL--3-brightgreen.svg?style=flat)
[![CRAN_Status_Badge](http://www.r-pkg.org/badges/version/gmapsdistance)](https://cran.r-project.org/package=gmapsdistance)

***Interface Between R and Google Maps ***
***Interface Between R and Google Maps***



Expand All @@ -31,6 +31,17 @@ install.packages("gmapsdistance")

```

#### XML-package dependency
`XML` package seems to have been removed from CRAN. `gmapsdistance` depends on it, thus the above installation would fail for R 3.5 and above.

##### Workaround
```R
install.packages("XML", repos = "http://www.omegahat.net/R")
```

##### Dockerfile
A clean installation including all necessary dependencies can be found in a Dockerfile, which has been tested and should work. See `example_install.dockerfile`.


## Example 1
In this example we will compute the driving distance between Washington DC, and New York City. The code returns the `Time`, the `Distance` and the `Status` of the query (`OK` if it was successful).
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29 changes: 29 additions & 0 deletions example_install.dockerfile
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@@ -0,0 +1,29 @@
FROM ubuntu:20.04
RUN apt update

# ------ Getting Latest R ------
# https://linuxize.com/post/how-to-install-r-on-ubuntu-20-04/

# base packages
RUN apt install dirmngr gnupg apt-transport-https ca-certificates software-properties-common -y

RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
RUN add-apt-repository 'deb https://cloud.r-project.org/bin/linux/ubuntu focal-cran40/'

RUN apt install r-base -y
RUN R --version

# XML-parsing back-end for R-XML
RUN apt install libxml2-dev -y

# XML-package in R got discontinued, but here's a workaround
RUN R -e 'install.packages("XML", repos = "http://www.omegahat.net/R")'

# We will also need curl
RUN apt install libcurl4-gnutls-dev -y

# with all the above, this should work
RUN R -e 'install.packages("gmapsdistance")'

# test
RUN R -e 'library(gmapsdistance)'