v/cmd/tools/vself.v

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module main
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import os
import os.cmdline
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import v.pref
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fn main() {
vexe := pref.vexe_path()
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vroot := os.dir(vexe)
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os.chdir(vroot)
os.setenv('VCOLORS', 'always', true)
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self_idx := os.args.index('self')
args := os.args[1..self_idx]
jargs := args.join(' ')
obinary := cmdline.option(args, '-o', '')
sargs := if obinary != '' { jargs } else { '$jargs -o v2 ' }
cmd := '$vexe $sargs cmd/v'
options := if args.len > 0 { '($sargs)' } else { '' }
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println('V self compiling ${options}...')
compile(vroot, cmd)
if obinary != '' {
// When -o was given, there is no need to backup/rename the original.
// The user just wants an independent copy of v, and so we are done.
return
}
backup_old_version_and_rename_newer()
}
fn compile(vroot string, cmd string) {
result := os.exec(cmd) or {
panic(err)
}
if result.exit_code != 0 {
eprintln('cannot compile to `$vroot`: \n$result.output')
exit(1)
}
if result.output.len > 0 {
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println(result.output.trim_space())
}
}
fn backup_old_version_and_rename_newer() {
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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}