v/examples/pendulum-simulation/modules/sim/args/parser.v

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module args
import flag
import os
import runtime
import sim
import math
// customisable through setting VJOBS
const max_parallel_workers = runtime.nr_jobs()
[params]
pub struct ParserSettings {
sequential bool
img bool
extra_workers int
}
pub struct SequentialArgs {
pub:
params sim.SimParams
grid sim.GridSettings
filename string
}
pub struct ParallelArgs {
SequentialArgs
pub:
workers int = args.max_parallel_workers
}
pub type SimArgs = ParallelArgs | SequentialArgs
pub fn parse_args(config ParserSettings) ?SimArgs {
if config.sequential {
args := parse_sequential_args()?
return SimArgs(args)
} else {
args := parse_parallel_args(config.extra_workers)?
return SimArgs(args)
}
}
fn parse_sequential_args() ?SequentialArgs {
mut fp := flag.new_flag_parser(os.args)
fp.application('vps')
fp.version('v0.1.0')
fp.limit_free_args(0, 0)?
fp.description('This is a pendulum simulation written in pure V')
fp.skip_executable()
// output parameters
width := fp.int('width', `w`, sim.default_width, 'width of the image output. Defaults to $sim.default_width')
height := fp.int('height', `h`, sim.default_height, 'height of the image output. Defaults to $sim.default_height')
filename := fp.string('output', `o`, 'out.ppm', 'name of the image output. Defaults to out.ppm')
// simulation parameters
rope_length := fp.float('rope-length', 0, sim.default_rope_length, 'rope length to use on simulation. Defaults to $sim.default_rope_length')
bearing_mass := fp.float('bearing-mass', 0, sim.default_bearing_mass, 'bearing mass to use on simulation. Defaults to $sim.default_bearing_mass')
magnet_spacing := fp.float('magnet-spacing', 0, sim.default_magnet_spacing, 'magnet spacing to use on simulation. Defaults to $sim.default_magnet_spacing')
magnet_height := fp.float('magnet-height', 0, sim.default_magnet_height, 'magnet height to use on simulation. Defaults to $sim.default_magnet_height')
magnet_strength := fp.float('magnet-strength', 0, sim.default_magnet_strength, 'magnet strength to use on simulation. Defaults to $sim.default_magnet_strength')
gravity := fp.float('gravity', 0, sim.default_gravity, 'gravity to use on simulation. Defaults to $sim.default_gravity')
fp.finalize() or {
println(fp.usage())
return none
}
params := sim.sim_params(
rope_length: rope_length
bearing_mass: bearing_mass
magnet_spacing: magnet_spacing
magnet_height: magnet_height
magnet_strength: magnet_strength
gravity: gravity
)
grid := sim.new_grid_settings(
width: width
height: height
)
args := SequentialArgs{
params: params
filename: filename
grid: grid
}
sim.log('$args')
return args
}
fn parse_parallel_args(extra_workers int) ?ParallelArgs {
mut fp := flag.new_flag_parser(os.args)
fp.application('vps')
fp.version('v0.1.0')
fp.limit_free_args(0, 0)?
fp.description('This is a pendulum simulation written in pure V')
fp.skip_executable()
workers := fp.int('workers', 0, args.max_parallel_workers, 'amount of workers to use on simulation. Defaults to $args.max_parallel_workers')
// output parameters
width := fp.int('width', `w`, sim.default_width, 'width of the image output. Defaults to $sim.default_width')
height := fp.int('height', `h`, sim.default_height, 'height of the image output. Defaults to $sim.default_height')
filename := fp.string('output', `o`, 'out.ppm', 'name of the image output. Defaults to out.ppm')
// simulation parameters
rope_length := fp.float('rope-length', 0, sim.default_rope_length, 'rope length to use on simulation. Defaults to $sim.default_rope_length')
bearing_mass := fp.float('bearing-mass', 0, sim.default_bearing_mass, 'bearing mass to use on simulation. Defaults to $sim.default_bearing_mass')
magnet_spacing := fp.float('magnet-spacing', 0, sim.default_magnet_spacing, 'magnet spacing to use on simulation. Defaults to $sim.default_magnet_spacing')
magnet_height := fp.float('magnet-height', 0, sim.default_magnet_height, 'magnet height to use on simulation. Defaults to $sim.default_magnet_height')
magnet_strength := fp.float('magnet-strength', 0, sim.default_magnet_strength, 'magnet strength to use on simulation. Defaults to $sim.default_magnet_strength')
gravity := fp.float('gravity', 0, sim.default_gravity, 'gravity to use on simulation. Defaults to $sim.default_gravity')
fp.finalize() or {
println(fp.usage())
return none
}
params := sim.sim_params(
rope_length: rope_length
bearing_mass: bearing_mass
magnet_spacing: magnet_spacing
magnet_height: magnet_height
magnet_strength: magnet_strength
gravity: gravity
)
grid := sim.new_grid_settings(
width: width
height: height
)
args := ParallelArgs{
params: params
filename: filename
grid: grid
workers: get_workers(workers, extra_workers)
}
sim.log('$args')
return args
}
[inline]
fn get_workers(workers int, extra_workers int) int {
result := if workers + extra_workers <= args.max_parallel_workers {
workers
} else {
args.max_parallel_workers - extra_workers
}
return math.max(1, result)
}