PythonEmbedInR is one of synapser's dependencies. It's an R package that requires C compilation. 

Mac System Dependencies

• OpenSSL 
• wget

Notes:

The easiest instruction I found was to use:

brew install wget

This command will install other wget dependencies including openssl. Don't forget to read the output of the brew command and add openssl to PATH in ~/.bash_profile.

Common errors and fixes:

Mac - libcryto.a not found

Repro

There are 2 ways to repro this problem. In Terminal:

1. clone the repo

2. run the following commands:

   cd PythonEmbedInR
   R CMD build .
   R CMD install PythonEmbedInR_0.0.0.tar.gz

3. error:

   * installing to library ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library’
   * installing *source* package ‘PythonEmbedInR’ ...
   ./configure: line 32: wget: command not found
     % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                    Dload  Upload   Total   Spent    Left  Speed
   100 19.6M  100 19.6M    0     0  19.5M      0  0:00:01  0:00:01 --:--:-- 19.5M
   Mac specific configuration
   cp: /usr/local/opt/openssl/lib/libcrypto.a: No such file or directory
   ERROR: configuration failed for package ‘PythonEmbedInR’
   * removing ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/PythonEmbedInR’
   * restoring previous ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/PythonEmbedInR’
   
   

In RStudio:

1. Open PythonEmbedInR project
2. Click Install and Restart

3. Error:

   ==> R CMD INSTALL --no-multiarch --with-keep.source PythonEmbedInR
   
   * installing to library ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library’
   * installing *source* package ‘PythonEmbedInR’ ...
   ./configure: line 32: wget: command not found
     % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                    Dload  Upload   Total   Spent    Left  Speed
     0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0Failed to download https://www.python.org/ftp/python/3.5.3/Python-3.5.3.tgz
     0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
   curl: (77) error setting certificate verify locations:
     CAfile: /Library/Frameworks/R.framework/Versions/3.5/Resources/library/PythonEmbedInR/lib/python3.5/site-packages/pip/_vendor/requests/cacert.pem
     CApath: none
   ERROR: configuration failed for package ‘PythonEmbedInR’
   * removing ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/PythonEmbedInR’
   * restoring previous ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/PythonEmbedInR’
   
   Exited with status 1.

Fix

Install the Mac System Dependencies listed above.

Local Work Flow

This section captures the process of making changes to the code, write tests, build, install, and run the tests. This section does not include Git practices.

RStudio is great to writing R packages. However, the PythonEmbedInR package requires the code to be compiled in C. When building the package in RStudio, RStudio will drive CPU to 100% for a long period of time. This workflow is optimizing the tools by using syntax highlighting in RStudio for code changes, and Terminal for building (may use up to 35% CPU) and running tests.

Step 1: Add changes to the code base in RStudio (including writing tests)
Step 2: In Terminal:

cd PythonEmbedInR
R CMD build .
R CMD install PythonEmbedInR_0.0.0.tar.gz

Step 3: In R:

setwd(sprintf('%s/tests', getwd()))
source('testthat.R')