From 51e3ff958516f0672921aae6d8bbbef5dcfc13c9 Mon Sep 17 00:00:00 2001
From: EviSong <evisong@live.com>
Date: Sun, 6 Jun 2021 16:42:10 +0800
Subject: [PATCH 1/2] [bin] wrap + unwrap cli support non-TTY (stdin)

---
 bin/unwrap.js | 47 ++++++++++++++++++++++++++++++-----------------
 bin/wrap.js   | 45 +++++++++++++++++++++++++++++----------------
 2 files changed, 59 insertions(+), 33 deletions(-)

diff --git a/bin/unwrap.js b/bin/unwrap.js
index e5174c0..4b24ca5 100644
--- a/bin/unwrap.js
+++ b/bin/unwrap.js
@@ -3,24 +3,37 @@
 'use strict';
 
 const attr = require('../lib/dynamodb-data-types').AttributeValue;
-const content = process.argv[2];
 
-if (!content) {
-  throw new Error('Input data required.')
+if (process.stdin.isTTY) {
+  unwrap(process.argv[2]);
+} else {
+  let data = "";
+  process.stdin.on('data', function(chunk) {
+    data += chunk;
+  });
+  process.stdin.on('end', function() {
+    unwrap(data);
+  });
 }
 
-let payload = '';
-try {
-  payload = JSON.parse(content);
-}
-catch (err) {
-  payload = content
-}
-const output = attr.unwrap(payload);
+function unwrap(content) {
+  if (!content) {
+    throw new Error('Input data required.')
+  }
 
-if (typeof output === 'object') {
-  process.stdout.write(JSON.stringify(output) + '\n');
-}
-else {
-  process.stdout.write(output + '\n');
-}
+  let payload = '';
+  try {
+    payload = JSON.parse(content);
+  }
+  catch (err) {
+    payload = content
+  }
+  const output = attr.unwrap(payload);
+
+  if (typeof output === 'object') {
+    process.stdout.write(JSON.stringify(output) + '\n');
+  }
+  else {
+    process.stdout.write(output + '\n');
+  }
+}
\ No newline at end of file
diff --git a/bin/wrap.js b/bin/wrap.js
index 25f25a7..2082888 100644
--- a/bin/wrap.js
+++ b/bin/wrap.js
@@ -3,24 +3,37 @@
 'use strict';
 
 const attr = require('../lib/dynamodb-data-types').AttributeValue;
-const content = process.argv[2];
 
-if (!content) {
-  throw new Error('Input data required.')
+if (process.stdin.isTTY) {
+  wrap(process.argv[2]);
+} else {
+  let data = "";
+  process.stdin.on('data', function(chunk) {
+    data += chunk;
+  });
+  process.stdin.on('end', function() {
+    wrap(data);
+  });
 }
 
-let payload = '';
-try {
-  payload = JSON.parse(content);
-}
-catch (err) {
-  payload = content
-}
-const output = attr.wrap(payload);
+function wrap(content) {
+  if (!content) {
+    throw new Error('Input data required.')
+  }
 
-if (typeof output === 'object') {
-  process.stdout.write(JSON.stringify(output) + '\n');
-}
-else {
-  process.stdout.write(output + '\n');
+  let payload = '';
+  try {
+    payload = JSON.parse(content);
+  }
+  catch (err) {
+    payload = content
+  }
+  const output = attr.wrap(payload);
+
+  if (typeof output === 'object') {
+    process.stdout.write(JSON.stringify(output) + '\n');
+  }
+  else {
+    process.stdout.write(output + '\n');
+  }
 }

From db9efb48e633d2b4ef43615df3f54401bc54c3e6 Mon Sep 17 00:00:00 2001
From: EviSong <evisong@live.com>
Date: Sun, 6 Jun 2021 16:50:53 +0800
Subject: [PATCH 2/2] Updated `Use in cli` section

---
 README.md     | 4 ++++
 bin/unwrap.js | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a943298..914cfaf 100644
--- a/README.md
+++ b/README.md
@@ -115,6 +115,10 @@ Use with the cli for quick utility
     dynamo-dt-attr-wrap '{"hello":"world"}'
     dynamo-dt-attr-unwrap '{"hello": {"S": "world"}}'
 
+Pipe is also supported
+
+    echo '{"hello":"world"}' | dynamo-dt-attr-wrap
+    echo '{"hello": {"S": "world"}}' | dynamo-dt-attr-unwrap
 
 ### Use in the browser
 
diff --git a/bin/unwrap.js b/bin/unwrap.js
index 4b24ca5..7bd9215 100644
--- a/bin/unwrap.js
+++ b/bin/unwrap.js
@@ -36,4 +36,4 @@ function unwrap(content) {
   else {
     process.stdout.write(output + '\n');
   }
-}
\ No newline at end of file
+}