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main.go
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main.go
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package main
import (
"bufio"
"encoding/json"
"flag"
"fmt"
"io"
"os"
"sort"
"github.com/fatih/color"
"github.com/nwidger/jsoncolor"
)
const (
exitOK = iota
exitOpenFile
exitReadInput
exitFormStatements
exitFetchURL
exitParseStatements
exitJSONEncode
)
var (
strColor = color.New(color.FgYellow)
braceColor = color.New(color.FgMagenta)
bareColor = color.New(color.FgBlue, color.Bold)
numColor = color.New(color.FgRed)
boolColor = color.New(color.FgCyan)
)
func init() {
flag.Usage = func() {
h := "Transform JSON (from a file, URL, or stdin) into discrete assignments to make it greppable\n\n"
h += "Usage:\n"
h += " gron [OPTIONS] [FILE|URL|-]\n\n"
h += "Options:\n"
h += " -u, --ungron Reverse the operation (turn assignments back into JSON)\n"
h += " -m, --monochrome Monochrome (don't colorize output)\n\n"
h += "Exit Codes:\n"
h += fmt.Sprintf(" %d\t%s\n", exitOK, "OK")
h += fmt.Sprintf(" %d\t%s\n", exitOpenFile, "Failed to open file")
h += fmt.Sprintf(" %d\t%s\n", exitReadInput, "Failed to read input")
h += fmt.Sprintf(" %d\t%s\n", exitFormStatements, "Failed to form statements")
h += fmt.Sprintf(" %d\t%s\n", exitFetchURL, "Failed to fetch URL")
h += fmt.Sprintf(" %d\t%s\n", exitParseStatements, "Failed to parse statements")
h += fmt.Sprintf(" %d\t%s\n", exitJSONEncode, "Failed to encode JSON")
h += "\n"
h += "Examples:\n"
h += " gron /tmp/apiresponse.json\n"
h += " gron http://jsonplaceholder.typicode.com/users/1 \n"
h += " curl -s http://jsonplaceholder.typicode.com/users/1 | gron\n"
h += " gron http://jsonplaceholder.typicode.com/users/1 | grep company | gron --ungron\n"
fmt.Fprintf(os.Stderr, h)
}
}
var (
ungronFlag bool
monochromeFlag bool
)
func init() {
jsoncolor.DefaultStringColor = strColor
jsoncolor.DefaultObjectColor = braceColor
jsoncolor.DefaultArrayColor = braceColor
jsoncolor.DefaultFieldColor = bareColor
jsoncolor.DefaultNumberColor = numColor
jsoncolor.DefaultTrueColor = boolColor
jsoncolor.DefaultFalseColor = boolColor
jsoncolor.DefaultNullColor = boolColor
}
func main() {
flag.BoolVar(&ungronFlag, "ungron", false, "Turn statements into JSON instead")
flag.BoolVar(&ungronFlag, "u", false, "Turn statements into JSON instead")
flag.BoolVar(&monochromeFlag, "monochrome", false, "Monochrome (don't colorize output)")
flag.BoolVar(&monochromeFlag, "m", false, "Monochrome (don't colorize output)")
flag.Parse()
var raw io.Reader
filename := flag.Arg(0)
if filename == "" || filename == "-" {
raw = os.Stdin
} else {
if !validURL(filename) {
r, err := os.Open(filename)
if err != nil {
fatal(exitOpenFile, "failed to open file", err)
}
raw = r
} else {
r, err := getURL(filename)
if err != nil {
fatal(exitFetchURL, "failed to fetch URL", err)
}
raw = r
}
}
var exitCode int
var err error
if ungronFlag {
exitCode, err = ungron(raw, os.Stdout)
} else {
exitCode, err = gron(raw, os.Stdout)
}
if exitCode != exitOK {
fatal(exitCode, "Fatal", err)
}
os.Exit(exitOK)
}
func gron(r io.Reader, w io.Writer) (int, error) {
formatter = colorFormatter{}
if monochromeFlag {
formatter = monoFormatter{}
}
ss, err := makeStatementsFromJSON(r)
if err != nil {
return exitFormStatements, fmt.Errorf("failed to form statements: %s", err)
}
// Go's maps do not have well-defined ordering, but we want a consistent
// output for a given input, so we must sort the statements
sort.Sort(ss)
for _, s := range ss {
fmt.Fprintln(w, s)
}
return exitOK, nil
}
func ungron(r io.Reader, w io.Writer) (int, error) {
scanner := bufio.NewScanner(r)
// Make a list of statements from the input
var ss statements
for scanner.Scan() {
ss.AddFull(scanner.Text())
}
if err := scanner.Err(); err != nil {
return exitReadInput, fmt.Errorf("failed to read input statements")
}
// ungron the statements
merged, err := ss.ungron()
if err != nil {
return exitParseStatements, fmt.Errorf("failed to parse input statements")
}
// If there's only one top level key and it's "json", make that the top level thing
mergedMap, ok := merged.(map[string]interface{})
if ok {
if len(mergedMap) == 1 {
if _, exists := mergedMap["json"]; exists {
merged = mergedMap["json"]
}
}
}
marshalIndent := jsoncolor.MarshalIndent
if monochromeFlag {
marshalIndent = json.MarshalIndent
}
j, err := marshalIndent(merged, "", " ")
if err != nil {
return exitJSONEncode, fmt.Errorf("failed to convert statements to JSON: %s", err)
}
fmt.Fprintf(w, "%s\n", j)
return exitOK, nil
}
func fatal(code int, msg string, err error) {
fmt.Fprintf(os.Stderr, "%s (%s)\n", msg, err)
os.Exit(code)
}