all: change optional to result of io (#16075)

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

@@ -31,21 +31,21 @@ pub:
 
 pub type SimArgs = ParallelArgs | SequentialArgs
 
-pub fn parse_args(config ParserSettings) ?SimArgs {
+pub fn parse_args(config ParserSettings) !SimArgs {
 	if config.sequential {
-		args := parse_sequential_args()?
+		args := parse_sequential_args()!
 		return SimArgs(args)
 	} else {
-		args := parse_parallel_args(config.extra_workers)?
+		args := parse_parallel_args(config.extra_workers)!
 		return SimArgs(args)
 	}
 }
 
-fn parse_sequential_args() ?SequentialArgs {
+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.limit_free_args(0, 0)!
 	fp.description('This is a pendulum simulation written in pure V')
 	fp.skip_executable()
 
@@ -64,7 +64,7 @@ fn parse_sequential_args() ?SequentialArgs {
 
 	fp.finalize() or {
 		println(fp.usage())
-		return none
+		return error('none')
 	}
 
 	params := sim.sim_params(
@@ -92,11 +92,11 @@ fn parse_sequential_args() ?SequentialArgs {
 	return args
 }
 
-fn parse_parallel_args(extra_workers int) ?ParallelArgs {
+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.limit_free_args(0, 0)!
 	fp.description('This is a pendulum simulation written in pure V')
 	fp.skip_executable()
 
@@ -117,7 +117,7 @@ fn parse_parallel_args(extra_workers int) ?ParallelArgs {
 
 	fp.finalize() or {
 		println(fp.usage())
-		return none
+		return error('none')
 	}
 
 	params := sim.sim_params(

examples/pendulum-simulation/modules/sim/img/ppm.v

@@ -39,34 +39,34 @@ mut:
 	cache_size int
 }
 
-pub fn ppm_writer_for_fname(fname string, settings ImageSettings) ?&PPMWriter {
+pub fn ppm_writer_for_fname(fname string, settings ImageSettings) !&PPMWriter {
 	mut writer := &PPMWriter{
 		cache_size: settings.cache_size
 		cache: []u8{cap: settings.cache_size}
 	}
-	writer.start_for_file(fname, settings)?
+	writer.start_for_file(fname, settings)!
 	return writer
 }
 
-pub fn (mut writer PPMWriter) start_for_file(fname string, settings ImageSettings) ? {
-	writer.file = os.create(fname)?
-	writer.file.writeln('P6 $settings.width $settings.height 255')?
+pub fn (mut writer PPMWriter) start_for_file(fname string, settings ImageSettings) ! {
+	writer.file = os.create(fname)!
+	writer.file.writeln('P6 $settings.width $settings.height 255')!
 }
 
-pub fn (mut writer PPMWriter) handle_pixel(p gx.Color) ? {
+pub fn (mut writer PPMWriter) handle_pixel(p gx.Color) ! {
 	if writer.cache.len >= writer.cache_size {
-		writer.write()?
-		writer.flush()?
+		writer.write()!
+		writer.flush()!
 	}
 	writer.cache << [p.r, p.g, p.b]
 }
 
-pub fn (mut writer PPMWriter) flush() ? {
+pub fn (mut writer PPMWriter) flush() ! {
 	writer.cache.clear()
 }
 
-pub fn (mut writer PPMWriter) write() ? {
-	writer.file.write(writer.cache)?
+pub fn (mut writer PPMWriter) write() ! {
+	writer.file.write(writer.cache)!
 }
 
 pub fn (mut writer PPMWriter) close() {

examples/pendulum-simulation/modules/sim/img/writer.v

@@ -29,7 +29,7 @@ pub fn new_image_writer(mut writer PPMWriter, settings ImageSettings) &ImageWrit
 	}
 }
 
-pub fn (mut iw ImageWritter) handle(result sim.SimResult) ?int {
+pub fn (mut iw ImageWritter) handle(result sim.SimResult) !int {
 	total_pixels := iw.settings.width * iw.settings.height
 
 	// find the closest magnet
@@ -46,7 +46,7 @@ pub fn (mut iw ImageWritter) handle(result sim.SimResult) ?int {
 
 	if iw.current_index == total_pixels {
 		iw.writer.write() or { panic('Could not write image') }
-		return none
+		return error('none')
 	}
 
 	return iw.current_index

examples/pendulum-simulation/modules/sim/runner.v

@@ -3,11 +3,11 @@ module sim
 import benchmark
 import term
 
-pub type SimRequestHandler = fn (request &SimRequest) ?
+pub type SimRequestHandler = fn (request &SimRequest) !
 
-pub type SimStartHandler = fn () ?
+pub type SimStartHandler = fn () !
 
-pub type SimFinishHandler = fn () ?
+pub type SimFinishHandler = fn () !
 
 pub const (
 	default_width  = 600