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https://github.com/fish-shell/fish-shell
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11f4e64e45
This would fail on very long numbers, e.g.
`math "1 + 1233242342353453463458972349873489273984873289472914712894791824712941"`
would now return "42", where it previously returned the correct "1233242342353453463458972349873489273984873289472914712894791824712942".
This reverts commit 26e781ef5a.
42 lines
1.3 KiB
Fish
42 lines
1.3 KiB
Fish
function math --description "Perform math calculations in bc"
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set -l scale 0 # default is integer arithmetic
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if set -q argv[1]
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switch $argv[1]
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case '-s*' # user wants to specify the scale of the output
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set scale (string replace -- '-s' '' $argv[1])
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if not string match -q -r '^\d+$' "$scale"
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echo 'Expected an integer to follow -s' >&2
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return 2 # missing argument is an error
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end
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set -e argv[1]
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case -h --h --he --hel --help
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__fish_print_help math
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return 0
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end
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end
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if not set -q argv[1]
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return 2 # no arguments is an error
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end
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# Stitch lines together manually. We can't rely on BC_LINE_LENGTH because some systems don't
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# have a new enough version of bc.
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set -l out (echo "scale=$scale; $argv" | bc | string replace -r '\\\\$' '' | string join '')
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switch "$out"
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case ''
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# No output indicates an error occurred.
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return 3
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case 0
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# For historical reasons a zero result translates to a failure status.
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echo 0
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return 1
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case '*'
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# For historical reasons a non-zero result translates to a success status.
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echo $out
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return 0
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end
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end
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