feat: cli argument to set width of diagnostic output (#118)

lib/bin.js

@@ -11,17 +11,17 @@ import { fromHex as _fromHex, toHex } from './byte-utils.js'
 function usage (code) {
   console.error('Usage: cborg <command> <args>')
   console.error('Valid commands:')
-  console.error('\tbin2diag [binary input]')
+  console.error('\tbin2diag [--width <width>] [binary input]')
   console.error('\tbin2hex [binary input]')
   console.error('\tbin2json [--pretty] [binary input]')
   console.error('\tdiag2bin [diagnostic input]')
   console.error('\tdiag2hex [diagnostic input]')
   console.error('\tdiag2json [--pretty] [diagnostic input]')
   console.error('\thex2bin [hex input]')
-  console.error('\thex2diag [hex input]')
+  console.error('\thex2diag [--width <width>] [hex input]')
   console.error('\thex2json [--pretty] [hex input]')
   console.error('\tjson2bin \'[json input]\'')
-  console.error('\tjson2diag \'[json input]\'')
+  console.error('\tjson2diag [--width <width>] \'[json input]\'')
   console.error('\tjson2hex \'[json input]\'')
   console.error('Input may either be supplied as an argument or piped via stdin')
   process.exit(code || 0)
@@ -54,6 +54,20 @@ function argvPretty () {
   return { argv, pretty }
 }
 
+function argvWidth () {
+  const widthIndex = process.argv.findIndex((s) => s === '--width')
+  if (widthIndex <= 0 || widthIndex + 1 >= process.argv.length) {
+    return { argv: process.argv.filter((s) => s !== '--width'), width: undefined }
+  }
+  const width = parseInt(process.argv[widthIndex + 1], 10)
+  if (!width || width < 20) {
+    return { argv: process.argv.filter((s) => s !== '--width'), width: undefined }
+  }
+  const argv = process.argv
+  argv.splice(widthIndex, 2)
+  return { argv, width }
+}
+
 async function run () {
   const cmd = process.argv[2]
 
@@ -64,8 +78,9 @@ async function run () {
 
     case 'bin2diag': {
       /* c8 ignore next 1 */
-      const bin = process.argv.length < 4 ? (await fromStdin()) : new TextEncoder().encode(process.argv[3])
-      for (const line of tokensToDiagnostic(bin)) {
+      const { argv, width } = argvWidth()
+      const bin = argv.length < 4 ? (await fromStdin()) : new TextEncoder().encode(argv[3])
+      for (const line of tokensToDiagnostic(bin, width)) {
         console.log(line)
       }
       return
@@ -114,8 +129,9 @@ async function run () {
     }
 
     case 'hex2diag': {
-      const bin = fromHex(process.argv.length < 4 ? (await fromStdin()).toString() : process.argv[3])
-      for (const line of tokensToDiagnostic(bin)) {
+      const { argv, width } = argvWidth()
+      const bin = fromHex(argv.length < 4 ? (await fromStdin()).toString() : argv[3])
+      for (const line of tokensToDiagnostic(bin, width)) {
         console.log(line)
       }
       return
@@ -134,9 +150,10 @@ async function run () {
     }
 
     case 'json2diag': {
-      const inp = process.argv.length < 4 ? (await fromStdin()).toString() : process.argv[3]
+      const { argv, width } = argvWidth()
+      const inp = argv.length < 4 ? (await fromStdin()).toString() : argv[3]
       const obj = JSON.parse(inp)
-      for (const line of tokensToDiagnostic(encode(obj))) {
+      for (const line of tokensToDiagnostic(encode(obj), width)) {
         console.log(line)
       }
       return