write_sigs: Write sigs to file
In sig: Print Function Signatures

Description Usage Arguments Details Value Examples

View source: R/write_sigs.R

Writes a list of function signatures to a file.

write_sigs(x, file = stdout(), ...)

## Default S3 method:
write_sigs(x, file = stdout(), ...)

## S3 method for class 'siglist'
write_sigs(x, file = stdout(), ...)

## S3 method for class 'environment'
write_sigs(x, file = stdout(), ...)

## S3 method for class 'character'
write_sigs(x, file = stdout(), ...)

`x`	A list of function signatures. See details.
`file`	A file path or connection to write the output to (stdout by default).
`...`	passed to `toString.siglist`.

Where x is an object of class |codesiglist, the function essentially calls writeLines(tostring(x)). If the input is a single function signature (of class sig), then it is coerced into a siglist. If the input is an environment or path to a file, then list_sigs is called on the input before writing.

A character vector of the lines that were written to file is invisibly returned. Mostly invoked for the side effect of writing function signatures to a file.

#Step by step:
#First, list some sigs.
utils_sigs <- list_sigs(pkg2env(utils))
#Without a file argument, sigs are just printed to the console.
head(write_sigs(utils_sigs))
#Write to a file
tmpf <- tempfile("sig", fileext = ".R")
write_sigs(utils_sigs, tmpf)
## Not run: 
Open the file we've just written
shell(tmpf, wait = FALSE)

## End(Not run)
#Can also list and write in one line.
tmpf2 <- tempfile("sig", fileext = ".R")
write_sigs(pkg2env(grDevices), tmpf2)
#Single sigs are coerced to siglists
write_sigs(sig(stats::var))