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https://github.com/fish-shell/fish-shell
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d97c22df2d
This makes it easy for the user to request floating point output with the desired number of digits after the decimal point (not to be confused with significant digits). Note that this is just a thin wrapper so someone can say `math -s3 10 / 3` rather than `math "scale=3; 10 /3"`. Resolves #1643
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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