Add support for .[]

DOCS.md

@@ -81,40 +81,35 @@ One of the frequent operations is mapping some function on an array. For example
   {
     "author": {
       "name": "antonmedv"
-    }, 
+    }
-    ...
   },
   {...},
-  {...},
   ...
 ]
 ```
 
-And we want to collect names of each object in array. We can do this by mapping anonymous function:
+And we want to collect names of each object in the array. We can do this by mapping anonymous function:
 
 ```bash
 $ cat ... | fx '.map(x => x.author.name)'
 ```
 
-Or we can do the same by using `@` prefix:
+Or we can do the same by using jq-like syntax:
 
 ```bash
-$ cat ... | fx @.author.name
+$ cat ... | fx .[].author.name
 [
   "antonmedv",
   ...
 ]
 ```
 
-Expression followed by `@` symbol will be mapped to each element of array.
+> Note what `[]` can be applied to map object values.
-
-> Note what `@` can be applied to map object values.
 > ```bash
-> $ echo '{"foo": 1, "bar": 2}' | fx @+1
+> $ echo '{"foo": 1, "bar": 2}' | fx .[]
-> [2, 3]
+> [1, 2]
 > ```
-> 
+
-> Also note what symbol `@` alone is equivalent of `Object.values` function.
 
 ### Chaining
 

README.md

@@ -27,7 +27,7 @@ brew install fx
 ```
 Or download standalone binary from [releases](https://github.com/antonmedv/fx/releases)
 ```bash
-bash <( curl -L https://fx.wtf )
+bash <( curl https://fx.wtf )
 ```
 
 ## Usage
@@ -65,6 +65,11 @@ $ echo '{"count": 0}' | fx '{...this, count: 1}'
 }
 ```
 
+Extract values from maps.
+```bash
+$ fx commits.json | fx .[].author.name
+```
+
 Print formatted JSON to stdout.
 ```bash
 $ curl ... | fx .

install.sh

@@ -1,75 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-set -u
-set -o pipefail
-
-put() {
-  echo -e "\e[1;32m$1\e[0m"
-}
-
-do_install() {
-  cat <<'EOM'
-
-  ______      _____           _        _ _
- |  ____|    |_   _|         | |      | | |
- | |____  __   | |  _ __  ___| |_ __ _| | | ___ _ __
- |  __\ \/ /   | | | '_ \/ __| __/ _` | | |/ _ \ '__|
- | |   >  <   _| |_| | | \__ \ || (_| | | |  __/ |
- |_|  /_/\_\ |_____|_| |_|___/\__\__,_|_|_|\___|_|
-
-EOM
-
-  platform=''
-  if [[ "$OSTYPE" == "linux"* ]]; then
-    platform='linux'
-  elif [[ "$OSTYPE" == "darwin"* ]]; then
-    platform='macos'
-  elif [[ "$OSTYPE" == "win"* ]]; then
-    platform='win.exe'
-  fi
-
-  if test "x$platform" = "x"; then
-    cat <<EOM
-/=====================================\\
-|      COULD NOT DETECT PLATFORM      |
-\\=====================================/
-
-Uh oh! We couldn't automatically detect your operating system.
-
-Please, download fx from https://github.com/antonmedv/fx/releases manually.
-EOM
-    exit 2
-  else
-    put "Detected platform: $platform"
-  fi
-
-  put "Downloading latest fx-$platform.zip"
-  curl -L "https://github.com/antonmedv/fx/releases/latest/download/fx-$platform.zip" > "fx-$platform.zip"
-
-  put "Extracting fx-$platform.zip"
-  unzip "fx-$platform.zip"
-  rm "fx-$platform.zip"
-  mv "fx-$platform" fx
-
-  name=''
-  read -p $'\e[1;35mWhould you like to move fx binary to /usr/local/bin?\e[0m [Y/n] ' -n 1 -r
-  echo
-  if [[ $REPLY =~ ^[Yy]$ ]]; then
-    mv fx /usr/local/bin/fx
-    name='fx'
-  else
-    name='./fx'
-  fi
-
-  cat <<EOM
-Now you can start using fx.
-
-    $ $name '.downloadCount + 1'
-
-EOM
-
-  curl -sAx http://bit.ly/downloads-count > /dev/null
-}
-
-do_install

package.json

@@ -46,8 +46,8 @@
     "string-width": "^4.2.0"
   },
   "devDependencies": {
-    "ava": "^3.9.0",
+    "ava": "^3.12.1",
-    "pkg": "^4.4.8",
+    "pkg": "^4.4.9",
-    "release-it": "^13.6.3"
+    "release-it": "^14.0.1"
   }
 }

reduce.js

@@ -13,10 +13,16 @@ function reduce(json, code) {
     return Object.keys(json)
   }
 
-  if (/^@/.test(code)) {
+  if (/^(\.\w*)+\[]/.test(code)) {
-    return eval(`function fn() { 
+    function fold(s) {
-      return Object.values(this).map(x => x${code.substring(1)}) 
+      if (s.length === 1) {
-    }; fn`).call(json)
+        return 'x => x' + s[0]
+      }
+      let obj = s.shift()
+      obj = obj === '.' ? 'x' : 'x' + obj
+      return `x => Object.values(${obj}).flatMap(${fold(s)})`
+    }
+    code = fold(code.split('[]'))
   }
 
   if (/^\.\[/.test(code)) {

std.js

@@ -1,5 +1,4 @@
 'use strict'
-const fs = require('fs')
 
 const skip = Symbol('skip')
 
@@ -25,7 +24,7 @@ function save(json) {
   if (!global.FX_FILENAME) {
     throw "No filename provided.\nTo edit-in-place, specify JSON file as first argument."
   }
-  fs.writeFileSync(global.FX_FILENAME, JSON.stringify(json, null, 2))
+  require('fs').writeFileSync(global.FX_FILENAME, JSON.stringify(json, null, 2))
   return json
 }
 

test.js

@@ -8,32 +8,32 @@ function fx(json, code = '') {
 }
 
 test('pass', t => {
-  const r = fx([{"greeting": "hello world"}])
+  const r = fx([{'greeting': 'hello world'}])
-  t.deepEqual(JSON.parse(r), [{"greeting": "hello world"}])
+  t.deepEqual(JSON.parse(r), [{'greeting': 'hello world'}])
 })
 
 test('anon func', t => {
-  const r = fx({"key": "value"}, "'function (x) { return x.key }'")
+  const r = fx({'key': 'value'}, '\'function (x) { return x.key }\'')
   t.is(r, 'value\n')
 })
 
 test('arrow func', t => {
-  const r = fx({"key": "value"}, "'x => x.key'")
+  const r = fx({'key': 'value'}, '\'x => x.key\'')
   t.is(r, 'value\n')
 })
 
 test('arrow func ()', t => {
-  const r = fx({"key": "value"}, "'(x) => x.key'")
+  const r = fx({'key': 'value'}, '\'(x) => x.key\'')
   t.is(r, 'value\n')
 })
 
 test('this bind', t => {
-  const r = fx([1, 2, 3, 4, 5], "'this.map(x => x * this.length)'")
+  const r = fx([1, 2, 3, 4, 5], '\'this.map(x => x * this.length)\'')
   t.deepEqual(JSON.parse(r), [5, 10, 15, 20, 25])
 })
 
 test('chain', t => {
-  const r = fx({"items": ["foo", "bar"]}, "'this.items' '.' 'x => x[1]'")
+  const r = fx({'items': ['foo', 'bar']}, '\'this.items\' \'.\' \'x => x[1]\'')
   t.is(r, 'bar\n')
 })
 
@@ -73,3 +73,13 @@ test('lossless number', t => {
   const r = execSync(`echo '{"long": 123456789012345678901}' | node index.js .long`).toString('utf8')
   t.is(r, '123456789012345678901\n')
 })
+
+test('value iterator', t => {
+  const r = fx({master: {foo: [{bar: [{val: 1}]}]}}, '.master.foo[].bar[].val')
+  t.deepEqual(JSON.parse(r), [1])
+})
+
+test('value iterator simple', t => {
+  const r = fx([{val:1},{val:2}], '.[].val')
+  t.deepEqual(JSON.parse(r), [1, 2])
+})