1 files changed, 183 insertions, 0 deletions
diff --git a/v_windows/v/cmd/tools/modules/scripting/scripting.v b/v_windows/v/cmd/tools/modules/scripting/scripting.v
new file mode 100644
index 0000000..342b9b7
--- /dev/null
+++ b/v_windows/v/cmd/tools/modules/scripting/scripting.v
@@ -0,0 +1,183 @@
+module scripting
+
+import os
+import term
+import time
+
+const (
+	term_colors = term.can_show_color_on_stdout()
+)
+
+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 cprint(omessage string) {
+	mut message := omessage
+	if scripting.term_colors {
+		message = term.cyan(message)
+	}
+	print(message)
+}
+
+pub fn cprint_strong(omessage string) {
+	mut message := omessage
+	if scripting.term_colors {
+		message = term.bright_green(message)
+	}
+	print(message)
+}
+
+pub fn cprintln(omessage string) {
+	cprint(omessage)
+	println('')
+}
+
+pub fn cprintln_strong(omessage string) {
+	cprint_strong(omessage)
+	println('')
+}
+
+pub fn verbose_trace(label string, message string) {
+	if os.getenv('VERBOSE').len > 0 {
+		slabel := '$time.now().format_ss_milli() $label'
+		cprintln('# ${slabel:-43s} : $message')
+	}
+}
+
+pub fn verbose_trace_strong(label string, omessage string) {
+	if os.getenv('VERBOSE').len > 0 {
+		slabel := '$time.now().format_ss_milli() $label'
+		mut message := omessage
+		if scripting.term_colors {
+			message = term.bright_green(message)
+		}
+		cprintln('# ${slabel:-43s} : $message')
+	}
+}
+
+pub fn verbose_trace_exec_result(x os.Result) {
+	if os.getenv('VERBOSE').len > 0 {
+		cprintln('#   cmd.exit_code : ${x.exit_code.str():-4s}  cmd.output:')
+		mut lnum := 1
+		lines := x.output.split_into_lines()
+		for oline in lines {
+			mut line := oline
+			if scripting.term_colors {
+				line = term.bright_green(line)
+			}
+			cprintln('# ${lnum:3d}: $line')
+			lnum++
+		}
+		cprintln('# ----------------------------------------------------------------------')
+	}
+}
+
+fn modfn(mname string, fname string) string {
+	return '${mname}.$fname'
+}
+
+pub fn chdir(path string) {
+	verbose_trace_strong(modfn(@MOD, @FN), 'cd $path')
+	os.chdir(path) or {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return
+	}
+}
+
+pub fn mkdir(path string) ? {
+	verbose_trace_strong(modfn(@MOD, @FN), 'mkdir $path')
+	os.mkdir(path) or {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return err
+	}
+}
+
+pub fn mkdir_all(path string) ? {
+	verbose_trace_strong(modfn(@MOD, @FN), 'mkdir -p $path')
+	os.mkdir_all(path) or {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return err
+	}
+}
+
+pub fn rmrf(path string) {
+	verbose_trace_strong(modfn(@MOD, @FN), 'rm -rf $path')
+	if os.exists(path) {
+		if os.is_dir(path) {
+			os.rmdir_all(path) or { panic(err) }
+		} else {
+			os.rm(path) or { panic(err) }
+		}
+	}
+}
+
+// execute a command, and return a result, or an error, if it failed in any way.
+pub fn exec(cmd string) ?os.Result {
+	verbose_trace_strong(modfn(@MOD, @FN), cmd)
+	x := os.execute(cmd)
+	if x.exit_code != 0 {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return error(x.output)
+	}
+	verbose_trace_exec_result(x)
+	return x
+}
+
+// run a command, tracing its results, and returning ONLY its output
+pub fn run(cmd string) string {
+	verbose_trace_strong(modfn(@MOD, @FN), cmd)
+	x := os.execute(cmd)
+	if x.exit_code < 0 {
+		verbose_trace(modfn(@MOD, @FN), '## failed.')
+		return ''
+	}
+	verbose_trace_exec_result(x)
+	if x.exit_code == 0 {
+		return x.output.trim_right('\r\n')
+	}
+	return ''
+}
+
+pub fn exit_0_status(cmd string) bool {
+	verbose_trace_strong(modfn(@MOD, @FN), cmd)
+	x := os.execute(cmd)
+	if x.exit_code < 0 {
+		verbose_trace(modfn(@MOD, @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(modfn(@MOD, @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 $f') // println('${size:10d} $f')
+	}
+}