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📄 columnify.js
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# columnify [](https://nodei.co/npm-dl/columnify/) [](https://nodei.co/npm/columnify/) [](https://travis-ci.org/timoxley/columnify) [](https://npmjs.org/package/columnify) [](LICENSE) [](https://david-dm.org/timoxley/columnify) [](https://david-dm.org/timoxley/columnify#info=devDependencies) Create text-based columns suitable for console output from objects or arrays of objects. Columns are automatically resized to fit the content of the largest cell. Each cell will be padded with spaces to fill the available space and ensure column contents are left-aligned. Designed to [handle sensible wrapping in npm search results](https://github.com/isaacs/npm/pull/2328). `npm search` before & after integrating columnify:  ## Installation & Update ``` $ npm install --save columnify@latest ``` ## Usage ```javascript var columnify = require('columnify') var columns = columnify(data, options) console.log(columns) ``` ## Examples ### Columnify Objects Objects are converted to a list of key/value pairs: ```javascript var data = { "commander@0.6.1": 1, "minimatch@0.2.14": 3, "mkdirp@0.3.5": 2, "sigmund@1.0.0": 3 } console.log(columnify(data)) ``` #### Output: ``` KEY VALUE commander@0.6.1 1 minimatch@0.2.14 3 mkdirp@0.3.5 2 sigmund@1.0.0 3 ``` ### Custom Column Names ```javascript var data = { "commander@0.6.1": 1, "minimatch@0.2.14": 3, "mkdirp@0.3.5": 2, "sigmund@1.0.0": 3 } console.log(columnify(data, {columns: ['MODULE', 'COUNT']})) ``` #### Output: ``` MODULE COUNT commander@0.6.1 1 minimatch@0.2.14 3 mkdirp@0.3.5 2 sigmund@1.0.0 3 ``` ### Columnify Arrays of Objects Column headings are extracted from the keys in supplied objects. ```javascript var columnify = require('columnify') var columns = columnify([{ name: 'mod1', version: '0.0.1' }, { name: 'module2', version: '0.2.0' }]) console.log(columns) ``` #### Output: ``` NAME VERSION mod1 0.0.1 module2 0.2.0 ``` ### Filtering & Ordering Columns By default, all properties are converted into columns, whether or not they exist on every object or not. To explicitly specify which columns to include, and in which order, supply a "columns" or "include" array ("include" is just an alias). ```javascript var data = [{ name: 'module1', description: 'some description', version: '0.0.1', }, { name: 'module2', description: 'another description', version: '0.2.0', }] var columns = columnify(data, { columns: ['name', 'version'] }) console.log(columns) ``` #### Output: ``` NAME VERSION module1 0.0.1 module2 0.2.0 ``` ## Global and Per Column Options You can set a number of options at a global level (ie. for all columns) or on a per column basis. Set options on a per column basis by using the `config` option to specify individual columns: ```javascript var columns = columnify(data, { optionName: optionValue, config: { columnName: {optionName: optionValue}, columnName: {optionName: optionValue}, } }) ``` ### Maximum and Minimum Column Widths As with all options, you can define the `maxWidth` and `minWidth` globally, or for specified columns. By default, wrapping will happen at word boundaries. Empty cells or those which do not fill the `minWidth` will be padded with spaces. ```javascript var columns = columnify([{ name: 'mod1', description: 'some description which happens to be far larger than the max', version: '0.0.1', }, { name: 'module-two', description: 'another description larger than the max', version: '0.2.0', }], { minWidth: 20, config: { description: {maxWidth: 30} } }) console.log(columns) ``` #### Output: ``` NAME DESCRIPTION VERSION mod1 some description which happens 0.0.1 to be far larger than the max module-two another description larger 0.2.0 than the max ``` #### Maximum Line Width You can set a hard maximum line width using the `maxLineWidth` option. Beyond this value data is unceremoniously truncated with no truncation marker. This can either be a number or 'auto' to set the value to the width of stdout. Setting this value to 'auto' prevent TTY-imposed line-wrapping when lines exceed the screen width. #### Truncating Column Cells Instead of Wrapping You can disable wrapping and instead truncate content at the maximum column width by using the `truncate` option. Truncation respects word boundaries. A truncation marker, `…`, will appear next to the last word in any truncated line. ```javascript var columns = columnify(data, { truncate: true, config: { description: { maxWidth: 20 } } }) console.log(columns) ``` #### Output: ``` NAME DESCRIPTION VERSION mod1 some description… 0.0.1 module-two another description… 0.2.0 ``` ### Align Right/Center You can set the alignment of the column data by using the `align` option. ```js var data = { "mocha@1.18.2": 1, "commander@2.0.0": 1, "debug@0.8.1": 1 } columnify(data, {config: {value: {align: 'right'}}}) ``` #### Output: ``` KEY VALUE mocha@1.18.2 1 commander@2.0.0 1 debug@0.8.1 1 ``` `align: 'center'` works in a similar way. ### Padding Character Set a character to fill whitespace within columns with the `paddingChr` option. ```js var data = { "shortKey": "veryVeryVeryVeryVeryLongVal", "veryVeryVeryVeryVeryLongKey": "shortVal" } columnify(data, { paddingChr: '.'}) ``` #### Output: ``` KEY........................ VALUE...................... shortKey................... veryVeryVeryVeryVeryLongVal veryVeryVeryVeryVeryLongKey shortVal................... ``` ### Preserve Existing Newlines By default, `columnify` sanitises text by replacing any occurance of 1 or more whitespace characters with a single space. `columnify` can be configured to respect existing new line characters using the `preserveNewLines` option. Note this will still collapse all other whitespace. ```javascript var data = [{ name: "glob@3.2.9", paths: [ "node_modules/tap/node_modules/glob", "node_modules/tape/node_modules/glob" ].join('\n') }, { name: "nopt@2.2.1", paths: [ "node_modules/tap/node_modules/nopt" ] }, { name: "runforcover@0.0.2", paths: "node_modules/tap/node_modules/runforcover" }] console.log(columnify(data, {preserveNewLines: true})) ``` #### Output: ``` NAME PATHS glob@3.2.9 node_modules/tap/node_modules/glob node_modules/tape/node_modules/glob nopt@2.2.1 node_modules/tap/node_modules/nopt runforcover@0.0.2 node_modules/tap/node_modules/runforcover ``` Compare this with output without `preserveNewLines`: ```javascript console.log(columnify(data, {preserveNewLines: false})) // or just console.log(columnify(data)) ``` ``` NAME PATHS glob@3.2.9 node_modules/tap/node_modules/glob node_modules/tape/node_modules/glob nopt@2.2.1 node_modules/tap/node_modules/nopt runforcover@0.0.2 node_modules/tap/node_modules/runforcover ``` ### Custom Truncation Marker You can change the truncation marker to something other than the default `…` by using the `truncateMarker` option. ```javascript var columns = columnify(data, { truncate: true, truncateMarker: '>', widths: { description: { maxWidth: 20 } } }) console.log(columns) ``` #### Output: ``` NAME DESCRIPTION VERSION mod1 some description> 0.0.1 module-two another description> 0.2.0 ``` ### Custom Column Splitter If your columns need some bling, you can split columns with custom characters by using the `columnSplitter` option. ```javascript var columns = columnify(data, { columnSplitter: ' | ' }) console.log(columns) ``` #### Output: ``` NAME | DESCRIPTION | VERSION mod1 | some description which happens to be far larger than the max | 0.0.1 module-two | another description larger than the max | 0.2.0 ``` ### Control Header Display Control whether column headers are displayed by using the `showHeaders` option. ```javascript var columns = columnify(data, { showHeaders: false }) ``` This also works well for hiding a single column header, like an `id` column: ```javascript var columns = columnify(data, { config: { id: { showHeaders: false } } }) ``` ### Transforming Column Data and Headers If you need to modify the presentation of column content or heading content there are two useful options for doing that: `dataTransform` and `headerTransform`. Both of these take a function and need to return a valid string. ```javascript var columns = columnify([{ name: 'mod1', description: 'SOME DESCRIPTION TEXT.' }, { name: 'module-two', description: 'SOME SLIGHTLY LONGER DESCRIPTION TEXT.' }], { dataTransform: function(data) { return data.toLowerCase() }, config: { name: { headingTransform: function(heading) { heading = "module " + heading return "*" + heading.toUpperCase() + "*" } } } }) ``` #### Output: ``` *MODULE NAME* DESCRIPTION mod1 some description text. module-two some slightly longer description text. ``` ## Multibyte Character Support `columnify` uses [mycoboco/wcwidth.js](https://github.com/mycoboco/wcwidth.js) to calculate length of multibyte characters: ```javascript var data = [{ name: 'module-one', description: 'some description', version: '0.0.1', }, { name: '这是一个很长的名字的模块', description: '这真的是一个描述的内容这个描述很长', version: "0.3.3" }] console.log(columnify(data)) ``` #### Without multibyte handling: i.e. before columnify added this feature ``` NAME DESCRIPTION VERSION module-one some description 0.0.1 这是一个很长的名字的模块 这真的是一个描述的内容这个描述很长 0.3.3 ``` #### With multibyte handling: ``` NAME DESCRIPTION VERSION module-one some description 0.0.1 这是一个很长的名字的模块 这真的是一个描述的内容这个描述很长 0.3.3 ``` ## Contributions ``` project : columnify repo age : 1 year, 2 months active : 32 days commits : 120 files : 54 authors : 90 Tim Oxley 75.0% 8 Tim 6.7% 7 Arjun Mehta 5.8% 6 Dany 5.0% 5 Wei Gao 4.2% 2 Dany Shaanan 1.7% 1 Seth Miller 0.8% 1 Isaac Z. Schlueter 0.8% ``` ## License MIT
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