flow_file_source: Creates a flow object that watches one or more files
In numeract/rflow: Flexible R Pipelines with Caching

Description Usage Arguments Details Value Examples

Creates a flow object that watches one or more files

1	flow_file_source(file_path, flow_options = get_flow_options())

`file_path`	A (named) vector of file paths to be watched or a `fs_path` object.
`flow_options`	List of options created using `get_flow_options`. All options except `eddy` are ignored.

This flow object does not throw an error if the file_path is missing, but it changes its state. Hence, it can be used to trigger a downstream flow object if the file is now present, changed or missing.

The flow object.

# write for the first time content in file and create flow
file_temp <- tempfile(pattern = "example_source")
write.csv(head(mtcars), file_temp, row.names = FALSE)
rflow_source <- flow_file_source(file_temp)

# write other content in the same file
# now the flow object will update its state
write.csv(tail(mtcars), file_temp, row.names = FALSE)
rflow_source <- flow_file_source(file_temp)
unlink(file_temp)