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v/cmd/tools/vbin2v.v

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module main
import os
import flag
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import strings
const (
tool_version = '0.0.4'
tool_description = 'Converts a list of arbitrary files into a single v module file.'
)
struct Context {
mut:
files []string
prefix string
show_help bool
module_name string
write_file string
}
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fn (context Context) header() string {
mut header_s := ''
header_s += 'module $context.module_name\n'
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header_s += '\n'
allfiles := context.files.join(' ')
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mut options := []string{}
if context.prefix.len > 0 {
options << '-p $context.prefix'
}
if context.module_name.len > 0 {
options << '-m $context.module_name'
}
if context.write_file.len > 0 {
options << '-w $context.write_file'
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}
soptions := options.join(' ')
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header_s += '// File generated by:\n'
header_s += '// v bin2v $allfiles $soptions\n'
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header_s += '// Please, do not edit this file.\n'
header_s += '// Your changes may be overwritten.\n'
header_s += 'const (\n'
return header_s
}
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fn (context Context) footer() string {
return ')\n'
}
fn (context Context) file2v(bname string, fbytes []byte, bn_max int) string {
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mut sb := strings.new_builder(1000)
bn_diff_len := bn_max - bname.len
sb.write('\t${bname}_len' + ' '.repeat(bn_diff_len - 4) + ' = $fbytes.len\n')
mut last_len := sb.len
fbyte := fbytes[0]
sb.write('\t$bname' + ' '.repeat(bn_diff_len) + ' = [byte($fbyte), ')
for i := 1; i < fbytes.len; i++ {
b := int(fbytes[i]).str()
sb_diff_len := sb.len - last_len
if i < 30 && sb_diff_len > 86 {
sb.write('$b,\n\t\t')
last_len = sb.len
} else if sb_diff_len > 88 && 92 - sb_diff_len < b.len {
sb.write('$b,\n\t\t')
last_len = sb.len
} else if i == fbytes.len - 1 {
sb.write(b)
} else {
sb.write('$b, ')
}
}
sb.write(']!!\n')
return sb.str()
}
fn (context Context) bname_and_bytes(file string) ?(string, []byte) {
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fname := os.file_name(file)
fname_no_dots := fname.replace('.', '_')
byte_name := '$context.prefix$fname_no_dots'.to_lower()
fbytes := os.read_bytes(file) or {
return error('Error: $err')
}
return byte_name, fbytes
}
fn (context Context) max_bname_len(bnames []string) int {
mut max := 0
for n in bnames {
if n.len > max {
max = n.len
}
}
// Add 4 to max due to "_len" suffix
return max + 4
}
fn main() {
mut context := Context{}
mut fp := flag.new_flag_parser(os.args[1..])
fp.application('v bin2v')
fp.version(tool_version)
fp.description(tool_description)
fp.arguments_description('FILE [FILE]...')
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context.show_help = fp.bool('help', `h`, false, 'Show this help screen.')
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context.module_name = fp.string('module', `m`, 'binary', 'Name of the generated module.')
context.prefix = fp.string('prefix', `p`, '', 'A prefix put before each resource name.')
context.write_file = fp.string('write', `w`, '', 'Write directly to a file with the given name.')
if context.show_help {
println(fp.usage())
exit(0)
}
files := fp.finalize() or {
eprintln('Error: ' + err)
exit(1)
}
real_files := files.filter(it != 'bin2v')
if real_files.len == 0 {
println(fp.usage())
exit(0)
}
context.files = real_files
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if !context.write_file.ends_with('.v') {
context.write_file += '.v'
}
mut file_byte_map := map[string][]byte{}
for file in real_files {
bname, fbytes := context.bname_and_bytes(file) or {
eprintln(err)
continue
}
file_byte_map[bname] = fbytes
}
max_bname := context.max_bname_len(file_byte_map.keys())
if context.write_file.len > 0 {
mut out_file := os.create(context.write_file) or {
panic(err)
}
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out_file.write(context.header())
for bname, fbytes in file_byte_map {
out_file.write(context.file2v(bname, fbytes, max_bname))
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}
out_file.write(context.footer())
} else {
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println(context.header())
for bname, fbytes in file_byte_map {
println(context.file2v(bname, fbytes, max_bname))
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}
println(context.footer())
}
}