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smart-units.sf
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#!/usr/bin/sidef
#`(if running under some shell) {
eval 'exec /usr/bin/sidef $0 ${1+"$@"}'
}
# Author: Daniel "Trizen" Șuteu
# License: GPLv3
# Date: 17 May 2014
# Edit: 07 August 2020
# https://github.com/trizen/smart-units
# A pretty clever command-line units converter (written in Sidef).
# Get the Sidef programming language from:
# https://github.com/trizen/sidef
# Reference:
# https://en.wikipedia.org/wiki/Conversion_of_units
define VERSION = 0.12
func more_help {
<<"HELP"
Mass:
42 kg to lbs : convert kilograms to pounds
30 t to grams : convert tonnes to grams
10 lbs to quintals : convert pounds to quintals
Temperature:
120 F to C : convert fahrenheit to celsius
-15 C to K : convert celsius to kelvin
420 K to F : convert kelvin to fahrenheit
Length:
21.1 in to cm : convert inches to centimetres
5.6 feet to m : convert feet to meters
4 light years in km : convert light years in km
Area:
1/2 Ha to yd^2 : convert hectares to square yards
2.5 mi^2 to acres : convert square miles to acres
29 ft^2 to m^2 : convert squre feet to square meters
Pressure:
300 Pa in atm : convert Pascal to atmospheres
1 mmHg in bars : convert mm of Mercury to bars
15 psi to ftH2O : convert pounds/in^2 to feet of water
Velocity:
4444 mi/h to km/s : convert miles per hour to km/s
50 m/s to km/h : convert meters per second to km/h
42 ft/s in m/h : convert feet/sec to meters/hour
Plane angle:
2 rad in deg : convert radians to degrees
90 deg in rad : convert degrees to radians
10 arcsec in grad : convert arc seconds to gradians
Frequency:
30 MHz to Hz : convert megahertz to hertz
42 KHz to GHz : convert kilohertz to gigahertz
10 GHz to MHz : convert gigahertz to megahertz
Time:
2 hours in sec : convert hours to seconds
3 years in mons : convert years to months
4 days in hours : convert days to hours
Information:
32 MB in KB : convert megabytes to kilobytes
42 TiB in GiB : convert tebibytes to gibibytes
97 Gbit in MiB : convert gigabits to mebibytes
...and more that are left for you to discover!
HELP
}
class Units {
has conversions = :(
mass => :( # all relative to 1 kilogram
nanograms => :(re => /^(ng|nanograms?)$/in, factor => 1e-12),
micrograms => :(re => /^([μu]g|micrograms?)$/in, factor => 1e-9),
milligrams => :(re => /^(mg|mill?igrams?)$/in, factor => 1e-6),
centigrams => :(re => /^(cg|centigrams?)$/in, factor => 1e-5),
decigrams => :(re => /^(dg|decigrams?)$/in, factor => 1e-4),
grams => :(re => /^(grams?|gr?)$/in, factor => 1e-3),
decagrams => :(re => /^(dag|decagrams?)$/in, factor => 1e-2),
hectograms => :(re => /^(hg|hectograms?)$/in, factor => 1e-1),
kilograms => :(re => /^(kg|kilograms?)$/in, factor => 1),
quintals => :(re => /^(quintals?)$/in, factor => 1e2),
tonnes => :(re => /^(tonn?es?|(?-i:t))$/in, factor => 1e3),
nanolitres => :(re => /^(nl|nanolit(re|er)s?)$/in, factor => 1e-9),
microlitres => :(re => /^([μu]l|microlit(re|er)s?)$/in, factor => 1e-6),
millilitres => :(re => /^(ml|mill?ilit(re|er)s?)$/in, factor => 1e-3),
centilitres => :(re => /^(cl|centilit(re|er)s?)$/in, factor => 1e-2),
decilitres => :(re => /^(dl|decilit(re|er)s?)$/in, factor => 1e-1),
litres => :(re => /^(l|lit(re|er)s?)$/in, factor => 1),
decalitres => :(re => /^(dal|decalit(re|er)s?)$/in, factor => 1e1),
hectolitres => :(re => /^(hl|hectolit(re|er)s?)$/in, factor => 1e2),
kilolitres => :(re => /^(kl|kilolit(re|er)s?)$/in, factor => 1e3),
pounds => :(re => /^(pounds?|lbs?)$/in, factor => 0.45359237),
stones => :(re => /^(stones?|st)$/in, factor => 6.35029318),
gallons => :(re => /^(gall?ons?|gall?s?)$/in, factor => 3.78541),
ounces => :(re => /^(ou?nces?|oz)$/in, factor => 0.0283495231),
fluid_ounces => :(re => /^fl(uid)? (ou?nces?|oz)$/in, factor => 0.0295735296),
cups => :(re => /^cups?$/in, factor => 0.2365882365),
gamma => :(re => /^(gamma|(?-i:γ))$/in, factor => 1e-9),
electronvolt => :(re => /^(eV|electron\s*?volts?)$/in, factor => 1.78266184 * 1e-36),
grain => :(re => /^(grains?)$/in, factor => 0.0000647989),
kip => :(re => /^(kips?)$/in, factor => 453.59237),
mark => :(re => /^(marks?)$/in, factor => 0.2488278144),
pennyweight => :(re => /^(penny\s*?weights?|dwt|pwt)$/in, factor => 0.00155517384),
point => :(re => /^(points?)$/in, factor => 0.000002),
carat => :(re => /^(carats?|ct)$/in, factor => 0.0002),
scruple => :(re => /^(scruple)$/in, factor => 0.0012959782),
sheet => :(re => /^(sheets?)$/in, factor => 0.0006479891),
slug => :(re => /^(slugs?)$/in, factor => 14.593903),
),
temperature => :( # using Celsius as the standard
celsius => :(re => /^(celsius|(?-i:C))$/in, code => {|n, _| n} ),
kelvin => :(re => /^(kelvin|(?-i:K))$/in, code => {|n, to| to ? (n + 273.15) : (-273.15 + n)} ),
fahrenheit => :(re => /^(fahrenheit|(?-i:F))$/in, code => {|n, to| to ? (32 + n*9/5) : ((n - 32) * 5/9)} ),
rankine => :(re => /^(rankine|(?-i:R))$/in, code => {|n, to| to ? ((n + 273.15) * 9/5) : (n*5/9 - 273.15)} ),
),
time => :( # all relative to 1 second
svedbergs => :(re => /^(svedbergs?|(?-i:S))$/in, factor => 1e-13),
nanoseconds => :(re => /^(nanosec(ond)?s?|(?-i:ns))$/in, factor => 1e-9),
shake => :(re => /^(shake)$/in, factor => 1e-8),
microseconds => :(re => /^(microsec(ond)?s?|(?-i:[uμ]s))$/in, factor => 1e-6),
milliseconds => :(re => /^(mill?isec(ond)?s?|(?-i:ms))$/in, factor => 1e-3),
seconds => :(re => /^(sec(ond)?s?|(?-i:s))$/in, factor => 1),
minutes => :(re => /^(min(ute)?s?)$/in, factor => 60),
moments => :(re => /^(mom(ent)?s?)$/in, factor => 90),
hours => :(re => /^(hours?|(?-i:h))$/in, factor => 3600),
days => :(re => /^(days?|(?-i:d))$/in, factor => 86400),
millidays => :(re => /^(millidays?|(?-i:md))$/in, factor => 86.4),
weeks => :(re => /^(weeks?|(?-i:wk))$/in, factor => 604800),
fortnights => :(re => /^(fortnights?|(?-i:fn))$/in, factor => 1209600),
months => :(re => /^(mon(th)?s?|(?-i:mo))$/in, factor => 2629743.83),
years => :(re => /^(years?)$/in, factor => 31556952),
decades => :(re => /^(decades?|(?-i:decs?))$/in, factor => 315569520),
centuries => :(re => /^(centur(y|ies)?|(?-i:c))$/in, factor => 3155695200),
heleks => :(re => /^(heleks?)$/in, factor => 10/3),
planck_time => :(re => /^(plank\s*time)$/in, factor => (5.39116 * 1e-44)),
),
velocity => :( # all relative to 1 meter / second
meters_per_second => :(re => /^ m(et(er|re)s?)? (\/|\s+per\s+) s(ec(ond)?)? $/inx, factor => 1),
miles_per_hour => :(re => /^ ( mph | mi(les?)? (\/|\s+per\s+) h(our)? ) $/inx, factor => 0.44704),
miles_per_minute => :(re => /^ ( mpm | mi(les?)? (\/|\s+per\s+) m(in(ute)?)? )$/inx, factor => 26.8224),
miles_per_second => :(re => /^ ( mps | mi(les?)? (\/|\s+per\s+) s(ec(ond)?)? )$/inx, factor => 1609.344),
metres_per_hour => :(re => /^ ( m(et(er|re)s?)? (\/|\s+per\s+) h(our)? ) $/inx, factor => 1/3600),
kilometers_per_hour => :(re => /^ ( km?ph | k(ilo)?m(et(er|re)s?)? (\/|\s+per\s+) h(our)? )$/inx, factor => 1/3.6),
kilometers_per_second => :(re => /^ ( km?ps | k(ilo)?m(et(er|re)s?)? (\/|\s+per\s+) s(ec(ond)?)? ) $/inx, factor => 1e3),
speed_of_light => :(re => /^ ( speed \s+ of \s+ light | (?-i:c) ) $/inx, factor => 299792458),
speed_of_sound => :(re => /^ ( speed \s+ of \s+ sound | (?-i:s) ) $/inx, factor => 340.29),
feet_per_hour => :(re => /^((foot|feet|ft)\s*(per|\/)\s*(hour|h)|fph)$/in, factor => 60959947/720000000000),
feet_per_minute => :(re => /^((foot|feet|ft)\s*(per|\/)\s*(min(ute)?|m)|fpm)$/in, factor => 60959947/12000000000),
feet_per_second => :(re => /^((foot|feet|ft)\s*(per|\/)\s*(sec(ond)?|s)|fps)$/in, factor => 0.304799735),
furlongs_per_fortnight => :(re => /^(furlong\s*(per|\/)\s*fortnight)$/in, factor => 1397/8400000),
inches_per_hour => :(re => /^((inch(es)?|in)\s*(per|\/)\s*(hour|h)|iph)$/in, factor => 127/18000000),
inches_per_minute => :(re => /^((inch(es)?|in)\s*(per|\/)\s*(min(ute)?|m)|ipm)$/in, factor => 127/300000),
inches_per_second => :(re => /^((inch(es)?|in)\s*(per|\/)\s*(sec(ond)?|s)|ips)$/in, factor => 0.0254),
knots => :(re => /^(knots?|kn|kts)$/in, factor => 463/900),
),
pressure => :( # all relative to 1 Pascal
atmospheres => :(re => /^(atmospheres?|atm)$/in, factor => 101325),
pièze => :(re => /^(pi[eè]ze|pz)$/in, factor => 1e3),
millibars => :(re => /^(mil?libars?)$/in, factor => 1e2),
bars => :(re => /^(bars?)$/in, factor => 1e5),
barye => :(re => /^(baryes?)$/in, factor => 0.1),
pascals => :(re => /^(pascals?|Pa)$/in, factor => 1),
hectopascals => :(re => /^(hectopascals?|hPa)$/in, factor => 1e2),
kilopascals => :(re => /^(kilopascals?|kPa)$/in, factor => 1e3),
gigapascals => :(re => /^(gigapascals?|GPa)$/in, factor => 1e9),
torr => :(re => /^(torrs?)$/in, factor => 133.322387415),
centimetre_of_mercury => :(re => /^((centimet(re|er)s?|cm)\s+of\s+(mercury|Hg)|cmHg)$/in, factor => 1333.22387415),
centimetre_of_water => :(re => /^((centimet(re|er)s?|cm)\s+of\s+(water|H2O)|cmH2O)$/in, factor => 98.0638),
metre_of_mercury => :(re => /^((met(re|er)s?|m)\s+of\s+(mercury|Hg)|mHg)$/in, factor => 133322),
metre_of_water => :(re => /^((met(re|er)s?|m)\s+of\s+(water|H2O)|mH2O)$/in, factor => 9806.38),
feet_of_mercury => :(re => /^((foot|feet|ft)\s+of\s+(mercury|Hg)|ftHg)$/in, factor => 40636.66),
feet_of_water => :(re => /^((foot|feet|ft)\s+of\s+(water|H2O)|ftH2O)$/in, factor => 2988.98),
inches_of_mercury => :(re => /^((inch(es)?|in)\s+of\s+(mercury|Hg)|inHg)$/in, factor => 3386.389),
inches_of_water => :(re => /^((inch(es)?|in)\s+of\s+(water|H2O)|inH2O)$/in, factor => 249.082),
pound_per_square_foot => :(re => /^((pound|lbs?)\s*(per|\/)\s*(ft|feet|foot)\^2|psf)$/in, factor => 47.88026),
pound_per_square_inch => :(re => /^((pound|lbs?)\s*(per|\/)\s*(inch(es)?|in)\^2|psi)$/in, factor => 6894.757),
poundal_per_square_foot => :(re => /^((poundal|pdl)\s*(per|\/)\s*(ft|feet|foot)\^2|pdl\s*\/\s*sq\s*ft)$/in, factor => 1.488164),
micrometres_of_mercury => :(re => /^((micro\s?m(et(re|er))?|[μu]m)\s+of\s+(mercury|Hg)|[μu]mHg)$/in, factor => 0.133322387415),
millimetres_of_mercury => :(re => /^((mill?i\s?m(et(re|er))?|mm)\s+of\s+(mercury|Hg)|mmHg)$/in, factor => 133.322387415),
millimetres_of_water => :(re => /^((mill?i\s?m(et(re|er))?|mm)\s+of\s+(water|H2O)|inH2O)$/in, factor => 9.80638),
),
area => :( # all relative to a square meter (1 m^2)
acres => :(re => /^(acres?|(?-i:ac))$/in, factor => 4046.8564224),
ares => :(re => /^(ares?|(?-i:a))$/in, factor => 1e2),
barns => :(re => /^(barns?|(?-i:b))$/in, factor => 1e-28),
barony => :(re => /^(barony)$/in, factor => 16187425.6896),
boards => :(re => /^(baords?|(?-i:bd))$/in, factor => 0.00774192),
cords => :(re => /^(cords?)$/in, factor => 1.48644864),
cuerda => :(re => /^(cuerdas?)$/in, factor => 3930.395625),
dunam => :(re => /^(dunams?)$/in, factor => 1e3),
guntha => :(re => /^(gunth?as?)$/in, factor => 101.17),
hectares => :(re => /^(hectares?|ha)$/in, factor => 1e4),
rood => :(re => /^(roods?|ro)$/in, factor => 1011.7141056),
ping => :(re => /^(pings?)$/in, factor => 3.306),
sections => :(re => /^(sections?)$/in, factor => 2589988.110336),
shed => :(re => /^(sheds?)$/in, factor => 1e-52),
stremma => :(re => /^(stremmas?)$/in, factor => 1e3),
townships => :(re => /^(townships?)$/in, factor => 93239944.92),
yardlands => :(re => /^(yardlands?)$/in, factor => 120000),
square_chains => :(re => /^(sq(uare)?\s*(chains?|ch)|ch\^2)$/in, factor => 404.68564224),
square_feet => :(re => /^(sq(uare)?\s*(feets?|foots?|ft)|ft\^2)$/in, factor => 0.09290304),
square_inches => :(re => /^(sq(uare)?\s*(inch(es)?|in)|in\^2)$/in, factor => 0.00064516),
square_metres => :(re => /^(sq(uare)?\s*(met(er|re)s?|m)|m\^2)$/in, factor => 1),
square_kilometres => :(re => /^(sq(uare)?\s*(kilomet(er|re)s?|km)|km\^2)$/in, factor => 1e6),
square_miles => :(re => /^(sq(uare)?\s*(miles?|mi)|mi\^2)$/in, factor => 2589988.110336),
square_yards => :(re => /^(sq(uare)?\s*(yards?|yd)|yd\^2)$/in, factor => 0.83612736),
),
length => :( # all relative to 1 meter
kilometers => :(re => /^k(ilo)?m(et(er|re)s?)?$/in, factor => 1e3),
meters => :(re => /^m(et(er|re)s?)?$/in, factor => 1),
centimetres => :(re => /^(centimet(er|re)s?|cm)$/in, factor => 1e-2),
millimetres => :(re => /^(millimet(er|re)s?|mm)$/in, factor => 1e-3),
micrometres => :(re => /^(micromet(er|re)s?|[μu]m)$/in, factor => 1e-6),
nanometres => :(re => /^(nanomet(er|re)s?|nm)$/in, factor => 1e-9),
ångströms => :(re => /^(ångströms?|angstroms?|Å)$/in, factor => 1e-10),
picometres => :(re => /^(picomet(er|re)s?|pm)$/in, factor => 1e-12),
femtometres => :(re => /^(femtomet(er|re)s?|fm|fermi)$/in, factor => 1e-15),
attometres => :(re => /^(attomet(er|re)s?|am)$/in, factor => 1e-18),
zeptometres => :(re => /^(zeptomet(er|re)s?|zm)$/in, factor => 1e-21),
yoctometres => :(re => /^(yoctomet(er|re)s?|ym)$/in, factor => 1e-24),
feet => :(re => /^(feets?|ft|foots?)$/in, factor => 0.304799735),
inches => :(re => /^(inch(es)?|in|")$/in, factor => 0.0254),
miles => :(re => /^(miles?|mi)$/in, factor => 1609.344),
yards => :(re => /^(yards?|yd)$/in, factor => 0.9144),
astronomical_units => :(re => /^(astronomic(al)?[-\s]*units?|(?-i:AU))$/in, factor => 149597870700),
parsecs => :(re => /^(parsecs?|(?-i:pc))$/in, factor => 30856775814913672.789),
light_seconds => :(re => /^(light[-\s]*sec(ond)?s?|ls)$/in, factor => 299792458),
light_minutes => :(re => /^(light[-\s]*min(ute)?s?|lm)$/in, factor => 1.798754748e10),
light_hours => :(re => /^(light[-\s]*hours?|lh)$/in, factor => 1.0792528488e12),
light_days => :(re => /^(light[-\s]*days?|ld)$/in, factor => 2.59020683712e13),
light_years => :(re => /^(light[-\s]*years?|ly)$/in, factor => 9.4607304725808e15),
ells => :(re => /^(ells?)$/in, factor => 1.143),
fingers => :(re => /^(fingers?)$/in, factor => 0.022225),
hands => :(re => /^(hands?)$/in, factor => 0.1016),
palms => :(re => /^(palms?)$/in, factor => 0.0762),
cable_lengths => :(re => /^(cable(\s*length)?s?)$/in, factor => 185.2),
chains => :(re => /^(chains?)$/in, factor => 20.11684),
cubits => :(re => /^(cubits?)$/in, factor => 0.5),
fathoms => :(re => /^(fathoms?)$/in, factor => 1.8288),
furlongs => :(re => /^(furlongs?|fur)$/in, factor => 201.168),
league => :(re => /^(league?|lea)$/in, factor => 4828),
lines => :(re => /^(lines?)$/in, factor => 127/60000),
rods => :(re => /^(rods?|rd)$/in, factor => 5.0292),
ropes => :(re => /^(ropes?)$/in, factor => 6.096),
shaku => :(re => /^(shaku)$/in, factor => 10/33),
spans => :(re => /^(spans?)$/in, factor => 0.2286),
sticks => :(re => /^(sticks?)$/in, factor => 0.0508),
twips => :(re => /^(twips?|twp)$/in, factor => 127/7200000),
),
information => :( # all relative to 1 bit
bits => :(re => /^(bits?)$/in, factor => 1),
bytes => :(re => /^(bytes?)$/in, factor => 8),
kilobits => :(re => /^(kilobits?|Kbits?)$/in, factor => 1000**1),
megabits => :(re => /^(megabits?|Mbits?)$/in, factor => 1000**2),
gigabits => :(re => /^(gigabits?|Gbits?)$/in, factor => 1000**3),
terabits => :(re => /^(terabits?|Tbits?)$/in, factor => 1000**4),
petabits => :(re => /^(petabits?|Pbits?)$/in, factor => 1000**5),
exabits => :(re => /^(exabits?|Ebits?)$/in, factor => 1000**6),
zettabits => :(re => /^(zettabits?|Zbits?)$/in, factor => 1000**7),
yottabits => :(re => /^(yottabits?|Ybits?)$/in, factor => 1000**8),
kibibits => :(re => /^(kibibits?|Kibits?)$/in, factor => 1024**1),
mebibits => :(re => /^(mebibits?|Mibits?)$/in, factor => 1024**2),
gibibits => :(re => /^(gibibits?|Gibits?)$/in, factor => 1024**3),
tebibits => :(re => /^(tebibits?|Tibits?)$/in, factor => 1024**4),
pebibits => :(re => /^(pebibits?|Pibits?)$/in, factor => 1024**5),
exbibits => :(re => /^(exbibits?|Eibits?)$/in, factor => 1024**6),
zebibits => :(re => /^(zebibits?|Zibits?)$/in, factor => 1024**7),
yobibits => :(re => /^(yobibits?|Yibits?)$/in, factor => 1024**8),
kilobytes => :(re => /^(kilobytes?|kb)$/in, factor => 8 * 1000**1),
megabytes => :(re => /^(megabytes?|mb)$/in, factor => 8 * 1000**2),
gigabytes => :(re => /^(gigabytes?|gb)$/in, factor => 8 * 1000**3),
terabytes => :(re => /^(terabytes?|tb)$/in, factor => 8 * 1000**4),
petabytes => :(re => /^(petabytes?|pb)$/in, factor => 8 * 1000**5),
exabytes => :(re => /^(exabytes?|eb)$/in, factor => 8 * 1000**6),
zettabytes => :(re => /^(zettabytes?|zb)$/in, factor => 8 * 1000**7),
yottabytes => :(re => /^(yottabytes?|yb)$/in, factor => 8 * 1000**8),
kibibytes => :(re => /^(kibibytes?|kib)$/in, factor => 8 * 1024**1),
mebibytes => :(re => /^(mebibytes?|mib)$/in, factor => 8 * 1024**2),
gibibytes => :(re => /^(gibibytes?|gib)$/in, factor => 8 * 1024**3),
tebibytes => :(re => /^(tebibytes?|tib)$/in, factor => 8 * 1024**4),
pebibytes => :(re => /^(pebibytes?|pib)$/in, factor => 8 * 1024**5),
exbibytes => :(re => /^(exbibytes?|eib)$/in, factor => 8 * 1024**6),
zebibytes => :(re => /^(zebibytes?|zib)$/in, factor => 8 * 1024**7),
yobibytes => :(re => /^(yobibytes?|yib)$/in, factor => 8 * 1024**8),
),
plane_angle => :( # all relative to 1 radian
radian => :(re => /^(rad(ian)?s?)$/in, factor => 1),
milliradian => :(re => /^(mill?irad(ian)?s?|mrad)$/in, factor => 1/1000),
degree => :(re => /^(deg(ree)?s?)$/in, factor => Num.pi/180),
quadrant => :(re => /^(quadrants?)$/in, factor => Num.pi/2),
sextant => :(re => /^(sextants?)$/in, factor => Num.pi/3),
octant => :(re => /^(octants?)$/in, factor => Num.pi/4),
sign => :(re => /^(signs?)$/in, factor => Num.pi/6),
grad => :(re => /^(grads?)$/in, factor => Num.pi/200),
arcseconds => :(re => /^(arcsec(ond)?s?)$/in, factor => Num.pi/648000),
arcminutes => :(re => /^(arcmin(ute)?s?)$/in, factor => Num.pi/10800),
),
frequency => :( # all relative to 1 hertz
hertz => :(re => /^(hertz|hz|cps)$/in, factor => 1),
kilohertz => :(re => /^(kiloherz|khz)$/in, factor => 1e3),
megahertz => :(re => /^(megahertz|mhz)$/in, factor => 1e6),
gigahertz => :(re => /^(gigahertz|ghz)$/in, factor => 1e9),
degree_per_second => :(re => /^(degree\s+per\s+second|deg\/s)$/in, factor => 1/360),
actions_per_minute => :(re => /^(actions\s+per\s+minute|apm)$/in, factor => 1/60),
radian_per_second => :(re => /^(radian\s+per\s+second|rad\/s)$/in, factor => 1/Num.tau),
revolutions_per_minute => :(re => /^(revolutions\s+per\s+minute|rpm)$/in, factor => Num.tau/60),
),
)
method convert(amount, from, to) {
var errors = []
conversions.each { |category, value|
value.each { |from_unit, from_data|
if (from.match(from_data{:re})) {
value.each_v{ |to_data|
if (to.match(to_data{:re})) {
var result = 0
if (from_data.has_key(:code) && to_data.has_key(:code)) {
var std_from = from_data{:code}(amount, false)
result = to_data{:code}(std_from, true)
} else {
result = (amount / to_data{:factor} * from_data{:factor})
}
return result
}
}
errors << ("#{category}: I don't know how to convert #{from_unit.gsub('_', ' ')} to #{to}...")
}
}
}
if (errors) {
errors.each {|msg|
STDERR.say(msg)
}
return nil
}
STDERR.say("I don't know how to convert #{from} to #{to}... Is '#{from}' a real unit?")
return nil
}
}
var precision = 10
var interactive = false
func help {
<<"USAGE"
usage: #{File.new(__FILE__).basename} [text]
options:
-i : start in interactive mode (default: #{interactive})
-p int : set floating point precision (default: #{precision})
examples:
144 F to C
convert 10kg into pounds
whats the equivalent of 21 inches in meters
what is the speed of light in miles per hour
USAGE
}
func round_result (value, precision) {
value.is_int ? value : value.round(-precision)
}
func process_input (command) {
static units = Units()
var match = command.match(/^\s*
(?(DEFINE)
(?<number>(?:[+-]?[0-9]*(?:[.,][0-9]+)*(?:[Ee](?:[+-]?[0-9]+))?))
)
# command or question
(?<command>(?:convert|how\s+much\s+is|what(?:\s+is|\W*s)(?:\s+the)?(?:\s+equivalent\s+of)?)\s+)?
# followed by a number or 'a' word or nothing
(?<amount>(?&number)(?:\s*\/\s*(?&number))?|(?:an?|one)(?=\s)|)
# unit from (up to 3 words)
\s*(?<from_unit>\S+(?:\s+\S+){0,2})
# 'to' token
\s+(?<separator>in|to|into|as)\s+
# unit to (up to 3 words)
(?<to_unit>\S+(?:\s+\S+){0,2})
\s*$/ix)
if (match) {
var (amount, from, to) = match.named_captures(){:amount,:from_unit,:to_unit}
if (amount ~~ ['a','an','one','']) {
amount = 1
}
else {
amount.gsub!(/,/, '')
amount = Number(amount)
}
var m1 = (from =~ %r{(.+?)/(.+)})
var m2 = (to =~ %r{(.+?)/(.+)})
if (m1 && m2) {
static time_aliases = :(
m => 'min',
h => 'hour',
s => 'sec',
d => 'day',
w => 'week',
y => 'year',
)
var len1 = m1[0]
var len2 = m2[0]
var time1 = time_aliases.fetch(m1[1].lc, m1[1])
var time2 = time_aliases.fetch(m2[1].lc, m2[1])
var r1 = units.convert(1, len1, len2)
var r2 = units.convert(1, time1, time2)
if (defined(r1) && defined(r2)) {
return round_result(amount * r1/r2, precision)
}
}
with (units.convert(amount, from, to)) { |r|
return round_result(r, precision)
}
}
else {
return try { eval(command) }
}
return nil
}
if (__FILE__ == __MAIN__) {
var cmd = []
while (ARGV) {
given (var arg = ARGV.shift) {
when ('-p') {
precision = Num(ARGV.shift)
}
when ('-i') {
interactive = true
}
when ('-h') {
print help()
Sys.exit(0)
}
when ('-v') {
say "smart-units #{VERSION}"
Sys.exit(0)
}
default {
cmd << arg
}
}
}
if (cmd.is_empty && STDIN.is_on_tty) {
interactive = true
}
if (interactive) {
print <<-"EOT"
Welcome to smart-units #{VERSION.float} in interactive mode.
EOT
loop {
var line = read(">> ", String) \\ break
if (line ~~ ['q', 'exit']) {
break
}
if (line =~ /help/i) {
print more_help()
next
}
line =~ /\S/ || next
with (process_input(line)) {|r|
try { say r.float } catch { say r }
}
}
}
else {
cmd || do { print help(); Sys.exit(1) }
with (process_input(cmd.join(' '))) { |r|
say r
}
else {
Sys.exit(1)
}
}
}