fix(stdin): throw errors on invalid input

replicates behavior prior to addition of stdin feature

src/command.js

@@ -4,6 +4,13 @@ import { validateJSONPath } from './utils'
 
 const JQ_PATH = process.env.JQ_PATH || path.join(__dirname, '..', 'bin', 'jq')
 
+export const FILTER_UNDEFINED_ERROR =
+  'node-jq: invalid filter argument supplied: "undefined"'
+export const INPUT_JSON_UNDEFINED_ERROR =
+  'node-jq: invalid json object argument supplied: "undefined"'
+export const INPUT_STRING_ERROR =
+  'node-jq: invalid json string argument supplied'
+
 const getFileArray = path => {
   if (Array.isArray(path)) {
     return path.reduce((array, file) => {
@@ -15,11 +22,33 @@ const getFileArray = path => {
   return [path]
 }
 
+const validateArguments = (filter, json, options) => {
+  if (typeof filter === 'undefined') {
+    throw new Error(FILTER_UNDEFINED_ERROR)
+  }
+
+  switch (options.input) {
+    case 'json':
+      if (typeof json === 'undefined') {
+        throw new Error(INPUT_JSON_UNDEFINED_ERROR)
+      }
+      break
+    case 'string':
+      if (!json) {
+        throw new Error(`${INPUT_STRING_ERROR}: "${json === '' ? '' : json}"`)
+      }
+      break
+  }
+}
+
 export const commandFactory = (filter, json, options = {}) => {
   const mergedOptions = {
     ...optionDefaults,
     ...options
   }
+
+  validateArguments(filter, json, mergedOptions)
+
   let args = [filter, ...parseOptions(mergedOptions)]
   let stdin = ''
 

src/utils.js

@@ -1,18 +1,20 @@
 import isPathValid from 'is-valid-path'
 
-const INVALID_PATH_ERROR = 'Invalid path'
-const INVALID_JSON_PATH_ERROR = 'Not a json file'
+export const INVALID_PATH_ERROR =
+  'node-jq: invalid path argument supplied (not a valid path)'
+export const INVALID_JSON_PATH_ERROR =
+  'node-jq: invalid path argument supplied (not a .json file)'
 
-export const isJSONPath = (path) => {
+export const isJSONPath = path => {
   return /\.json$/.test(path)
 }
 
-export const validateJSONPath = (JSONFile) => {
-  if (!isPathValid(JSONFile)) {
-    throw (Error(INVALID_PATH_ERROR))
+export const validateJSONPath = path => {
+  if (!isPathValid(path)) {
+    throw new Error(`${INVALID_PATH_ERROR}: "${path}"`)
   }
 
-  if (!isJSONPath(JSONFile)) {
-    throw (Error(INVALID_JSON_PATH_ERROR))
+  if (!isJSONPath(path)) {
+    throw new Error(`${INVALID_JSON_PATH_ERROR}: "${path === '' ? '' : path}"`)
   }
 }

test/jq.test.js

@@ -2,6 +2,8 @@ import { expect } from 'chai'
 import path from 'path'
 
 import { run } from '../src/jq'
+import { FILTER_UNDEFINED_ERROR } from '../src/command'
+import { INVALID_PATH_ERROR, INVALID_JSON_PATH_ERROR } from '../src/utils'
 
 const PATH_ROOT = path.join(__dirname, '..')
 const PATH_ASTERISK_FIXTURE = path.join(PATH_ROOT, 'src', '*.js')
@@ -12,14 +14,15 @@ const PATH_JS_FIXTURE = path.join(PATH_FIXTURES, '1.js')
 const PATH_LARGE_JSON_FIXTURE = path.join(PATH_FIXTURES, 'large.json')
 const PATH_VARIABLE_JSON_FIXTURE = path.join(PATH_FIXTURES, 'var.json')
 
+const FIXTURE_JSON = require('./fixtures/1.json')
+const FIXTURE_JSON_STRING = JSON.stringify(FIXTURE_JSON, null, 2)
+
 const FILTER_VALID = '.repository.type'
 const FILTER_INVALID = 'invalid'
 const FILTER_WITH_VARIABLE =
   '[ . as $x | .user[] | {"user": ., "site": $x.site} ]'
 
 const ERROR_INVALID_FILTER = /invalid/
-const ERROR_INVALID_PATH = 'Invalid path'
-const ERROR_INVALID_JSON_PATH = 'Not a json file'
 
 describe('jq core', () => {
   it('should fulfill its promise', done => {
@@ -33,6 +36,28 @@ describe('jq core', () => {
       })
   })
 
+  it('should pass on an empty filter', done => {
+    run('', PATH_JSON_FIXTURE)
+      .then(output => {
+        expect(output).to.equal(FIXTURE_JSON_STRING)
+        done()
+      })
+      .catch(error => {
+        done(error)
+      })
+  })
+
+  it('should pass on a null filter', done => {
+    run(null, PATH_JSON_FIXTURE)
+      .then(output => {
+        expect(output).to.equal('null')
+        done()
+      })
+      .catch(error => {
+        done(error)
+      })
+  })
+
   it('should fail on an invalid filter', done => {
     run(FILTER_INVALID, PATH_JSON_FIXTURE)
       .catch(error => {
@@ -45,11 +70,25 @@ describe('jq core', () => {
       })
   })
 
+  it('should fail on an undefined filter', done => {
+    run(undefined, PATH_JSON_FIXTURE)
+      .catch(error => {
+        expect(error).to.be.an.instanceof(Error)
+        expect(error.message).to.equal(FILTER_UNDEFINED_ERROR)
+        done()
+      })
+      .catch(error => {
+        done(error)
+      })
+  })
+
   it('should fail on an invalid path', done => {
     run(FILTER_VALID, PATH_ASTERISK_FIXTURE)
       .catch(error => {
         expect(error).to.be.an.instanceof(Error)
-        expect(error.message).to.equal(ERROR_INVALID_PATH)
+        expect(error.message).to.equal(
+          `${INVALID_PATH_ERROR}: "${PATH_ASTERISK_FIXTURE}"`
+        )
         done()
       })
       .catch(error => {
@@ -61,7 +100,9 @@ describe('jq core', () => {
     run(FILTER_VALID, PATH_JS_FIXTURE)
       .catch(error => {
         expect(error).to.be.an.instanceof(Error)
-        expect(error.message).to.equal(ERROR_INVALID_JSON_PATH)
+        expect(error.message).to.equal(
+          `${INVALID_JSON_PATH_ERROR}: "${PATH_JS_FIXTURE}"`
+        )
         done()
       })
       .catch(error => {