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math: Set BC_LINE_LENGTH to a very high number

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This means we no longer have to do manual stitching which improves performance.
This commit is contained in:
Fabian Homborg 2016-12-29 15:13:48 +01:00
parent 7ffcb828fe
commit b29b026106
1 changed files with 6 additions and 3 deletions
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9
share/functions/math.fish
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@ -21,9 +21,12 @@ function math --description "Perform math calculations in bc"
return 2 # no arguments is an error
end
# Stitch lines together manually. We can't rely on BC_LINE_LENGTH because some systems don't
# have a new enough version of bc.
set -l out (echo "scale=$scale; $argv" | bc | string replace -r '\\\\$' '' | string join '')
# Set BC_LINE_LENGTH to a ridiculously high number so it only uses one line for most results.
# Results with more digits than that are basically never used anyway.
# We can't use 0 since some systems (including macOS) use an ancient bc that doesn't support it.
# 32767 should still work on 2-byte int systems, though this is untested.
set -lx BC_LINE_LENGTH 32767
set -l out (echo "scale=$scale; $argv" | bc)
switch "$out"
case ''
# No output indicates an error occurred.