initial commit

cli_display.go

@@ -0,0 +1,122 @@
+package cli
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"runtime"
+	"strings"
+	"sync"
+)
+
+type Printer struct {
+	mutex     sync.Mutex
+	Program   string
+	Debugging bool
+	Color     bool
+}
+
+func (printer *Printer) Debug(v ...any) {
+	if printer.Debugging {
+		printer.mutex.Lock()
+		fmt.Fprint(os.Stdout, "dbg ")
+		_, file, line, ok := runtime.Caller(2)
+		if ok {
+			lastSegment := strings.LastIndex(file, "/") + 1
+			fmt.Fprint(os.Stdout, "@ ", file[lastSegment:], ":", line, " ")
+		}
+		fmt.Fprintln(os.Stdout, v...)
+		printer.mutex.Unlock()
+	}
+}
+
+func fprintIndented(f *os.File, maxWidth int, indent int, value any) {
+	wrapped := wrap.Indents(indent, wrap.Wrap(fmt.Sprint(value), maxWidth-indent))
+	for _, line := range wrapped {
+		fmt.Fprintln(f, line)
+	}
+}
+
+func (printer *Printer) printErrorMessage(msg string, details ...error) {
+	termInfo := GetStderrInfo()
+	if termInfo.SupportsColor && printer.Color {
+		errorStyle(os.Stderr)
+	}
+
+	fmt.Fprintln(os.Stderr, "Error:", msg)
+	for _, detail := range details {
+		fprintIndented(os.Stderr, termInfo.Width, 3, detail)
+	}
+
+	if termInfo.SupportsColor && printer.Color {
+		resetStyle(os.Stderr)
+	}
+}
+
+func (printer *Printer) Error(msg string, details ...error) {
+	printer.mutex.Lock()
+	printer.printErrorMessage(msg, details...)
+	printer.mutex.Unlock()
+}
+
+func (printer *Printer) Fatal(msg string, reason ExitReason, details ...error) {
+	printer.mutex.Lock()
+	printer.printErrorMessage(msg, details...)
+	if reason == BadUsage {
+		fmt.Fprintf(os.Stdout, "run '%s --help' for usage\n", printer.Program)
+	}
+	os.Exit(int(reason))
+}
+
+var defaultPrinter Printer
+
+func DefaultPrinter() *Printer {
+	return &defaultPrinter
+}
+
+func Debug(v ...any) {
+	defaultPrinter.Debug(v...)
+}
+
+func Error(msg string, details ...error) {
+	defaultPrinter.Error(msg, details...)
+}
+
+func Fatal(msg string, reason ExitReason, details ...error) {
+	defaultPrinter.Fatal(msg, reason, details...)
+}
+
+func InvalidArgs(errs ...error) {
+	Fatal("invalid command-line arguments", BadUsage, errs...)
+}
+
+func Show(msg string) {
+	termInfo := GetStdoutInfo()
+	wrapped := wrap.Wrap(msg, termInfo.Width)
+	for _, line := range wrapped {
+		fmt.Println(line)
+	}
+}
+
+func ShowUsage(explanation string, examples ...string) {
+	fmt.Print(explanation, "\n\nUsage:\n")
+	for _, line := range wrap.Indents(3, examples) {
+		fmt.Println(line)
+	}
+}
+
+func DescribeOption(name string, description string) {
+	name = "   " + name + "  "
+	termInfo := GetStdoutInfo()
+	wrapped := wrap.Indentfs(name, len(name), wrap.Wrap(description, termInfo.Width-len(name)))
+	for _, line := range wrapped {
+		fmt.Println(line)
+	}
+}
+
+func AskString(prompt string) string {
+    fmt.Print(prompt)
+    reader := bufio.NewReader(os.Stdin)
+    text, _ := reader.ReadString('\n')
+    return text
+}