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more expressive implementation by using "meaningful" variable names that reflect the intent #21

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more expressive implementation by using "meaningful" variable names that reflect the intent #21

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9 changes: 5 additions & 4 deletions lib/tmpdir.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -19,10 +19,11 @@ class Dir
# Returns the operating system's temporary file path.

def self.tmpdir
['TMPDIR', 'TMP', 'TEMP', ['system temporary path', @@systmpdir], ['/tmp']*2, ['.']*2].find do |name, dir|
unless dir
next if !(dir = ENV[name]) or dir.empty?
end
candidate_dirs = ['TMPDIR', 'TMP', 'TEMP'].map(&ENV.method(:[]))
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@nobu nobu Oct 25, 2022

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This always looks up 3 environment variables, even unused.

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@pvdb pvdb Oct 25, 2022 •
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True, but the original implementation always creates 3 - arguably quite convoluted - arrays, even unused.

['system temporary path', @@systmpdir], ['/tmp']*2, ['.']*2]

(especially "wasteful" IMO considering that most of the time the tmpdir will be set in the process' environment and these 3 fallbacks don't even come into play) 😅

Like I said, it's a style-change more than a functional one, but I quite like the expressiveness personally. 😃

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@nobu nobu Oct 26, 2022

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Why is name gone?

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@pvdb pvdb Oct 26, 2022 •
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It's no longer needed: it's now iterating over a list of 6 directory paths, whereas previously it was iterating over a combination of 3 environment variable names (TMPDIR, TMP and TEMP, which got turned into a directory path inside the block) and 3 directory paths (@@systmpdir, /tmp, and .)

For the first three entries, the dir in (name, dir) was always empty, as it was determined inside the block
For the last three entries, the name in (name, dir) was superfluous and totally unused.

This new version avoids all that confusion, and doesn't need to create the 3 superfluous, convoluted arrays I mentioned before: it's now iterating over a homogeneous collection of just 6 actual directory paths.

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@nobu nobu Oct 26, 2022

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It is still needed for the warning messages.

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@pvdb pvdb Oct 26, 2022

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Argh, I see what you mean... I (wrongly!) assumed, because all tests passed, it was a kosher refactor, which clearly it isn't! 🤦

Back to the drawing board! 😅

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@pvdb pvdb Oct 26, 2022

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Oh, IC... the various assert_warn() assertions in the tests only check part of the warning message, not the entire thing. 🤔

fallback_dirs = [@@systmpdir, '/tmp', '.']

(candidate_dirs + fallback_dirs).find do |dir|
next if !dir or dir.empty?
dir = File.expand_path(dir)
stat = File.stat(dir) rescue next
case
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