- Update on 2012/03/04
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Later the idea was turned into a package formatR and many details have been enhanced there. See the GitHub repo for details.
In the past I used to make use of
source(my_source_file, echo = TRUE, prompt = "") to “tidy up” my code because
it’s not convenient for me to type every space between operators, what’s more, I
have no fixed rules to break a line or make a proper indent. Thus I need a
function to automatically “tidy up” my code.
After I read the source code of the function source(), I quickly found that
the actual workhorse is parse(), which can turn your code file into neat
expressions, and the rest work is just to extract substrings. Here is a proof of
concept:
tidy.source = function(file = choose.files()) {
exprs = parse(file)
for (i in 1:length(exprs)) {
dep = paste(deparse(exprs[i]), collapse = "\n")
dep = substring(dep, 12, nchar(dep) - 1)
cat(dep, "\n")
}
}
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