refactor and improve both functions

uses promise.all now

.gitignore

@@ -1,2 +1,3 @@
 /node_modules/
 /coverage/
+test/combined2.list

api.md

@@ -0,0 +1,37 @@
+## Functions
+
+<dl>
+<dt><a href="#readLines">readLines(files, dir)</a> ⇒ <code>Promise.&lt;array&gt;</code></dt>
+<dd><p>read lines from one or more files and return an array of those all those lines</p>
+</dd>
+<dt><a href="#writeLines">writeLines(filePath, list)</a> ⇒ <code>Promise.&lt;null&gt;</code></dt>
+<dd><p>Writes files with a line for each element in a array or item in comma delimited list</p>
+</dd>
+</dl>
+
+<a name="readLines"></a>
+
+## readLines(files, dir) ⇒ <code>Promise.&lt;array&gt;</code>
+read lines from one or more files and return an array of those all those lines
+
+**Kind**: global function  
+**Returns**: <code>Promise.&lt;array&gt;</code> - - resolves to an single array of all lines from all files (no guarenteed order)  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| files | <code>array</code> \| <code>string</code> | array or comma delimited string of file paths.  Can be absolute or relative (see dir) |
+| dir | <code>string</code> | the directory to join to any relative paths |
+
+<a name="writeLines"></a>
+
+## writeLines(filePath, list) ⇒ <code>Promise.&lt;null&gt;</code>
+Writes files with a line for each element in a array or item in comma delimited list
+
+**Kind**: global function  
+**Returns**: <code>Promise.&lt;null&gt;</code> - can catch errors but otherwise nothing resolves  
+
+| Param | Type | Description |
+| --- | --- | --- |
+| filePath | <code>string</code> | filepath to which file is written |
+| list | <code>array</code> \| <code>string</code> | each element becomes line in file | each comma delimited item becomes a line |
+

package.json

@@ -28,9 +28,7 @@
     "url": "https://github.com/uCOMmandIt/uci-utils/issues"
   },
   "homepage": "https://github.com/uCOMmandIt/uci-utils#readme",
-  "dependencies": {
-    "p-settle": "^5.1.1"
-  },
+  "dependencies": {},
   "devDependencies": {
     "chai": "^5.1.2",
     "chai-arrays": "^2.2.0",
@@ -38,4 +36,4 @@
     "mocha": "^11.0.1",
     "nodemon": "^3.1.9"
   }
-}
+}

readme.md

@@ -1,2 +1,7 @@
 ### Read Lines to Array
 #### a uCOMmandIt Utiltiy Function
+
+
+exports two functions, readlines, writelines
+
+[API](./api.md)

src/read-lines.js

@@ -1,50 +1,49 @@
-import { promisify } from 'util'
-import path from 'path'
-import { readFile, writeFile } from 'fs'
-const read = promisify(readFile)
-const write = promisify(writeFile)
-import settle from 'p-settle'
-// import logger from '@uci-utils/logger'
-// let log = logger({ package:'@uci-utils/read-lines', file:'src/read-lines.js'})
+import path from 'node:path'
+import { readFile as read, writeFile as write, stat } from 'node:fs/promises'
 
-// read lines from one or more files
+
+/**
+ * read lines from one or more files and return an array of those all those lines
+ * @param {array|string} files - array or comma delimited string of file paths.  Can be absolute or relative (see dir)
+ * @param {string} dir - the directory to join to any relative paths
+ * @returns {Promise<array>} - resolves to an single array of all lines from all files (no guarenteed order)
+ */
 function readLines (files=[],dir) {
-  // log.debug({files:files,dir:dir,msg:'additional files'})
   let list = []
-  if (!Array.isArray(files)) files=[files]
-  // each set in an the array is new line delimited set of ignore patterns
-  // settle returns array of error,value pairs
-  return settle(files.map(file => {
-    // console.log('directory',path.dirname(file))
-    if (path.dirname(file)==='.') file = dir+'/'+file
-    // log.debug({function:'readLines',file:file,msg:'reading a file of lines into array'})
-    return read(file)
+  // if not an array of file names it must be a string
+  if (!Array.isArray(files)) files=files.split(',')
+  return Promise.all(files.map(async file => {
+    if (! path.isAbsolute(file) ) { 
+      if ( typeof dir === 'string'  ) {
+        file = path.join(dir,file)
+      }}   
+    return await read(file)
+      .then(lines => { 
+        list.push(...lines.toString().match(/.+/g))
+        return Promise.resolve(lines)
+       })
+      .catch(e => {
+        return Promise.reject(e)
+      });
   }))
     .then((sets) => {
-      sets.forEach( set =>  {
-        if (set.isFulfilled) list.push(...set.value.toString().match(/.+/g))
-        else 
-         console.log("unable to read file")
-      // log.warn({function:'readLines', error:set.reason, msg:' was unable to read file'})
-      })
       return Promise.resolve(list)
     })
     .catch((err) => {
-      // only returned when something horrible is wrong
       return Promise.reject(err)
     })
 }
 
-// an ignore list should not be huge so can serailize at once
-function writeLines (filePath,list) {
 
+/**
+ * Writes files with a line for each element in a array or item in comma delimited list
+ * @param {string} filePath - filepath to which file is written
+ * @param {array|string} list - each element becomes line in file | each comma delimited item becomes a line
+ * @returns {Promise<null>}  can catch errors but otherwise nothing resolves
+ */
+function writeLines (filePath,list) {
+  if (typeof list === "string") list = list.split(',')
   return write(filePath,list.join('\n'))
-    .then(() => {
-      // log.info({function:'writeLines', file:filePath, msg:'wrote array to file of lines'})
-    })
-    .catch( err => {
-      // log.fatal({function:'writeLines', error:err, msg:'unable to write array to file of lines'})
-    })
 }
 
 export default readLines

test/combined.list

@@ -1,7 +0,0 @@
-/node_modules/
-/coverage/
-tests/
-test/
-*.test.js
-testing/
-example/

test/read-lines.test.js

@@ -1,5 +1,3 @@
-// let ignoreFiles = ['.npmignore','.gitignore']
-
 import { readLines, writeLines }  from '../src/read-lines.js'
 import { it } from 'mocha'
 import { dirname } from 'dirname-filename-esm';
@@ -41,6 +39,20 @@ function readList() {
     let result = await readLines(['./test/.gitignore',__dirname+'/.npmignore'])
     expect(result, 'list build failed').to.be.containingAllOf(shouldbe)
   })
+
+  it('==> can read files passed as a comma delimited string', async function () {
+    const shouldbe = [ 'tests/',
+      'test/',
+      '*.test.js',
+      'testing/',
+      'example/',
+      '/node_modules/',
+      '/coverage/' ]
+    let result = await readLines('test/.gitignore,test/.npmignore')
+    expect(result, 'list build failed').to.be.containingAllOf(shouldbe)
+  })
+
+
 }
 
 
@@ -52,4 +64,12 @@ function writeList() {
     const result = await readLines(['combined.list'],__dirname)
     expect(result, 'list build failed').to.be.containingAllOf(shouldbe)
   })
+
+   it('==> can write an comma delimited string of items as lines in a file', async function () {
+    const shouldbe = await readLines(['.gitignore','.npmignore'],__dirname)
+    await writeLines(__dirname+'/combined2.list',shouldbe.join(','))
+    const result = await readLines(['combined2.list'],__dirname)
+    expect(result, 'list build failed').to.be.containingAllOf(shouldbe)
+  })
+
 }