False negative format detection by R script with relative data path

[machawk1]

I installed fch via pip but wanted to generate plots, so also ran git clone https://github.com/oduwsdl/FollowerCountHistory in /tmp/.

While my current working directory is /tmp/, I ran fch machawk1 > followers.csv. This created /tmp/followers.csv.

I then moved into the source directory using cd FollowerCountHistory/, ran Rscript twitterFollowerCount.R ../followers.csv, and received an error message with no plots generated:

[1] "Unsupported file type"
Warning message:
In if (ext == "csv") { :
  the condition has length > 1 and only the first element will be used

However, running the same command with an absolute path to the CSV file works, i.e., Rscript twitterFollowerCount.R /tmp/followers.csv generates plots without an error. Further, moving the CSV file into the source directory (mv ../followers.csv ./) and running Rscript twitterFollowerCount.R followers.csv works but adding the relative part of the data path, Rscript twitterFollowerCount.R ./followers.csv causes the same above error.

This is likely an issue with the Rscript trying to detect the file type and choking on anything but the absolute path or the data file in the same directory.

• FollowerCountHistory from current master (e918af7)
• fch 1.0.10 from pypi. (via pip freeze, as there is no documented -v flag, Provide a way for fch to report the current version of the tool that is installed #21 )
• Python 3.8.5, macOS 10.15.6
• R scripting front-end version 4.0.2 (2020-06-22)

[naumansiddiqui4]

Used tool library to get file extension.

ext = file_ext(basename(args[1]))
path = dirname(args[1])
Commit Id: 8b48e0d

[naumansiddiqui4]

Check the previous comment.