v/cmd/tools/vself.v

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module main
import (
os
v.pref
)
fn main() {
println('V Self Compiling...')
vexe := pref.vexe_path()
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vroot := os.dir(vexe)
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os.chdir(vroot)
s2 := os.exec('$vexe -o v2 cmd/v') or {
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panic(err)
}
if s2.output.len > 0 {
println(s2.output)
}
if s2.exit_code != 0 {
exit(1)
}
v_file := if os.user_os() == 'windows' { 'v.exe' } else { 'v' }
v2_file := if os.user_os() == 'windows' { 'v2.exe' } else { 'v2' }
bak_file := if os.user_os() == 'windows' { 'v_old.exe' } else { 'v_old' }
if os.exists(bak_file) {
os.rm(bak_file)
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}
os.mv(v_file, bak_file)
os.mv(v2_file, v_file)
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}