Add identify command

Author: stilvoid

cmd/identify.go

@@ -0,0 +1,50 @@
+package cmd
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/andrew-d/go-termutil"
+	"github.com/pborman/getopt"
+	"github.com/stilvoid/please/parsers"
+)
+
+func init() {
+	Commands["identify"] = identifyCommand
+}
+
+func identifyHelp() {
+	fmt.Println("Usage: please identify")
+	fmt.Println()
+	fmt.Println("Identifies the format of the structured data on standard input")
+}
+
+func identifyCommand(args []string) {
+	opts := getopt.CommandLine
+
+	opts.SetUsage(identifyHelp)
+
+	if termutil.Isatty(os.Stdin.Fd()) {
+		getopt.Usage()
+		os.Exit(1)
+	}
+
+	var err error
+
+	// Read from stdin
+	input, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "Error reading input")
+		os.Exit(1)
+	}
+
+	format, _, err := parsers.Identify(input)
+
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	fmt.Println(format)
+}

main.go

@@ -11,6 +11,7 @@ func printHelp() {
 	fmt.Println("Usage: please <COMMAND> [arg...]")
 	fmt.Println()
 	fmt.Println("Commands:")
+	fmt.Println("    identify   Identify the structured data on stdin")
 	fmt.Println("    request    Make a web request and output the result")
 	fmt.Println("    respond    Listen for a web request and respond to it")
 	fmt.Println("    parse      Get values from structured data and convert between formats")