move v.v to cmd/v

cmd/tools/modules/scripting/scripting.v

@@ -0,0 +1,100 @@
+module scripting
+
+import os
+
+pub fn set_verbose(on bool) {
+	// setting a global here would be the obvious solution,
+	// but V does not have globals normally.
+	if on {
+		os.setenv('VERBOSE', '1', true)
+	}
+	else {
+		os.unsetenv('VERBOSE')
+	}
+}
+
+pub fn verbose_trace(label string, message string) {
+	if os.getenv('VERBOSE').len > 0 {
+		slabel := 'scripting.${label}'
+		println('# ${slabel:-25s} : $message')
+	}
+}
+
+pub fn verbose_trace_exec_result(x os.Result) {
+	if os.getenv('VERBOSE').len > 0 {
+		println('#   cmd.exit_code : ${x.exit_code.str():-4s}  cmd.output:')
+		println('# ----------------------------------- #')
+		mut lnum := 1
+		lines := x.output.split_into_lines()
+		for line in lines {
+			println('# ${lnum:3d}: $line')
+			lnum++
+		}
+		println('# ----------------------------------- #')
+	}
+}
+
+pub fn chdir(path string) {
+	verbose_trace(@FN, 'cd $path')
+	os.chdir(path)
+}
+
+pub fn rmrf(path string) {
+	verbose_trace(@FN, 'rm -rf $path')
+	if os.exists(path) {
+		if os.is_dir(path) {
+			os.rmdir_recursive(path)
+		}else{
+			os.rm(path)
+		}
+	}
+}
+
+pub fn run(cmd string) string {
+	verbose_trace(@FN, cmd)
+	x := os.exec(cmd) or {
+		verbose_trace(@FN, '## failed.')
+		return ''
+	}
+	verbose_trace_exec_result(x)
+	if x.exit_code == 0 {
+		return x.output
+	}
+	return ''
+}
+
+pub fn exit_0_status(cmd string) bool {
+	verbose_trace(@FN, cmd)
+	x := os.exec(cmd) or {
+		verbose_trace(@FN, '## failed.')
+		return false
+	}
+	verbose_trace_exec_result(x)
+	if x.exit_code == 0 {
+		return true
+	}
+	return false
+}
+
+pub fn tool_must_exist (toolcmd string) {
+	verbose_trace(@FN, toolcmd)
+	if exit_0_status('type $toolcmd') {
+		return
+	}
+	eprintln('Missing tool: $toolcmd')
+	eprintln('Please try again after you install it.')
+	exit(1)
+}
+
+pub fn used_tools_must_exist(tools []string) {
+	for t in tools {
+		tool_must_exist(t)
+	}
+}
+
+pub fn show_sizes_of_files(files []string) {
+	for f in files {
+		size := os.file_size(f)
+		println('${size:10d} $f')
+	}
+}