cmd: re-use existing ui library

Also, move CLI-only utils into `cmd` rather than the top-level package.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

cmd/dagger/cmd/compute.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"fmt"
 
+	"dagger.cloud/go/cmd/dagger/ui"
 	"dagger.cloud/go/dagger"
-	"dagger.cloud/go/dagger/ui"
 	"github.com/spf13/cobra"
 )
 
@@ -18,14 +18,14 @@ var computeCmd = &cobra.Command{
 		// FIXME: boot and bootdir should be config fields, not args
 		c, err := dagger.NewClient(ctx, "", "", args[0])
 		if err != nil {
-			ui.Fatal(err)
+			ui.FatalErr(err)
 		}
 		// FIXME: configure which config to compute (duh)
 		// FIXME: configure inputs
 		ui.Info("Running")
 		output, err := c.Compute(ctx)
 		if err != nil {
-			ui.Fatal(err)
+			ui.FatalErr(err)
 		}
 		ui.Info("Processing output")
 		fmt.Println(output.JSON())

cmd/dagger/cmd/root.go

@@ -1,7 +1,7 @@
 package cmd
 
 import (
-	"dagger.cloud/go/dagger/ui"
+	"dagger.cloud/go/cmd/dagger/ui"
 	"github.com/spf13/cobra"
 )
 
@@ -30,6 +30,6 @@ func init() {
 
 func Execute() {
 	if err := rootCmd.Execute(); err != nil {
-		ui.Fatal(err)
+		ui.FatalErr(err)
 	}
 }

cmd/dagger/ui/ui.go

@@ -0,0 +1,144 @@
+package ui
+
+import (
+	"fmt"
+	"hash/adler32"
+	"io"
+	"os"
+	"unicode/utf8"
+
+	"github.com/mitchellh/colorstring"
+)
+
+var (
+	// Colorize is the main colorizer
+	Colorize = colorstring.Colorize{
+		Colors: colorstring.DefaultColors,
+		Reset:  true,
+	}
+)
+
+// Finfo prints an info message to w.
+func Finfo(w io.Writer, msg string, args ...interface{}) {
+	fmt.Fprintf(w, Colorize.Color("[bold][blue]info[reset] %s\n"), fmt.Sprintf(msg, args...))
+}
+
+// Info prints an info message.
+func Info(msg string, args ...interface{}) {
+	Finfo(os.Stdout, msg, args...)
+}
+
+// Fverbose prints a verbose message to w.
+func Fverbose(w io.Writer, msg string, args ...interface{}) {
+	fmt.Fprintf(w, Colorize.Color("[dim]%s\n"), fmt.Sprintf(msg, args...))
+}
+
+// Verbose prints a verbose message.
+func Verbose(msg string, args ...interface{}) {
+	Fverbose(os.Stdout, msg, args...)
+}
+
+// Fsuccess prints a success message to w.
+func Fsuccess(w io.Writer, msg string, args ...interface{}) {
+	fmt.Fprintf(w, Colorize.Color("[bold][green]success[reset] %s\n"), fmt.Sprintf(msg, args...))
+}
+
+// Success prints a success message.
+func Success(msg string, args ...interface{}) {
+	Fsuccess(os.Stdout, msg, args...)
+}
+
+// Fwrror prints an error message to w.
+func Ferror(w io.Writer, msg string, args ...interface{}) {
+	fmt.Fprintf(w, Colorize.Color("[bold][red]error[reset] %s\n"), fmt.Sprintf(msg, args...))
+}
+
+// Error prints an error message.
+func Error(msg string, args ...interface{}) {
+	Ferror(os.Stdout, msg, args...)
+}
+
+// Fwarning prints a warning message to w.
+func Fwarning(w io.Writer, msg string, args ...interface{}) {
+	fmt.Fprintf(os.Stderr, Colorize.Color("[bold][yellow]warning[reset] %s\n"), fmt.Sprintf(msg, args...))
+}
+
+// Warning prints a warning message.
+func Warning(msg string, args ...interface{}) {
+	Fwarning(os.Stdout, msg, args...)
+}
+
+// Ffatal prints an error message to w and exits.
+func Ffatal(w io.Writer, msg string, args ...interface{}) {
+	fmt.Fprintf(w, Colorize.Color("[bold][red]fatal[reset] %s\n"), fmt.Sprintf(msg, args...))
+	os.Exit(1)
+}
+
+// Fatal prints an error message and exits.
+func Fatal(msg string, args ...interface{}) {
+	Ffatal(os.Stderr, msg, args...)
+}
+
+// FfatalErr prints an error object to w and exits.
+func FfatalErr(w io.Writer, err error) {
+	Ffatal(w, "%v", err)
+}
+
+// FatalErr prints an error object and exits.
+func FatalErr(err error) {
+	FfatalErr(os.Stderr, err)
+}
+
+// Small returns a `small` colored string.
+func Small(msg string) string {
+	return Colorize.Color("[dim]" + msg)
+}
+
+// Primary returns a `primary` colored string.
+func Primary(msg string) string {
+	return Colorize.Color("[light_green]" + msg)
+}
+
+// Highlight returns a `highlighted` colored string.
+func Highlight(msg string) string {
+	return Colorize.Color("[cyan]" + msg)
+}
+
+// Truncate truncates a string to the given length
+func Truncate(msg string, length int) string {
+	for utf8.RuneCountInString(msg) > length {
+		msg = msg[0:len(msg)-4] + "…"
+	}
+	return msg
+}
+
+// HashColor returns a consistent color for a given string
+func HashColor(text string) string {
+	colors := []string{
+		"green",
+		"light_green",
+		"light_blue",
+		"blue",
+		"magenta",
+		"light_magenta",
+		"light_yellow",
+		"cyan",
+		"light_cyan",
+		"red",
+		"light_red",
+	}
+	h := adler32.Checksum([]byte(text))
+	return colors[int(h)%len(colors)]
+}
+
+// PrintLegend prints a demo of the ui functions
+func PrintLegend() {
+	Info("info message")
+	Success("success message")
+	Error("error message")
+	Warning("warning message")
+	Verbose("verbose message")
+	fmt.Printf("this is %s\n", Small("small"))
+	fmt.Printf("this is %s\n", Primary("primary"))
+	fmt.Printf("this is a %s\n", Highlight("highlight"))
+}

dagger/ui/ui.go

@@ -1,26 +0,0 @@
-package ui
-
-import (
-	"fmt"
-	"os"
-	"strings"
-)
-
-func Fatalf(msg string, args ...interface{}) {
-	if !strings.HasSuffix(msg, "\n") {
-		msg += "\n"
-	}
-	fmt.Fprintf(os.Stderr, msg, args...)
-	os.Exit(1)
-}
-
-func Fatal(msg interface{}) {
-	Fatalf("%s\n", msg)
-}
-
-func Info(msg string, args ...interface{}) {
-	if !strings.HasSuffix(msg, "\n") {
-		msg += "\n"
-	}
-	fmt.Fprintf(os.Stderr, "[info] "+msg, args...)
-}

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/KromDaniel/jonson v0.0.0-20180630143114-d2f9c3c389db
 	github.com/containerd/console v1.0.1
 	github.com/emicklei/proto v1.9.0 // indirect
+	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db
 	github.com/moby/buildkit v0.8.1
 	github.com/pkg/errors v0.9.1
 	github.com/spf13/cobra v1.0.0

go.sum

@@ -615,6 +615,8 @@ github.com/maxbrunsfeld/counterfeiter/v6 v6.2.2/go.mod h1:eD9eIE7cdwcMi9rYluz88J
 github.com/mgutz/ansi v0.0.0-20170206155736-9520e82c474b/go.mod h1:01TrycV0kFyexm33Z7vhZRXopbI8J3TDReVlkTgMUxE=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
+github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
+github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
 github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/go-ps v0.0.0-20190716172923-621e5597135b/go.mod h1:r1VsdOzOPt1ZSrGZWFoNhsAedKnEd6r9Np1+5blZCWk=