171 lines
7.1 KiB
Markdown
171 lines
7.1 KiB
Markdown
# External Editor
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[](https://travis-ci.org/mrkmg/node-external-editor/branches)
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[](https://www.npmjs.com/package/external-editor)
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[](https://opensource.org/licenses/MIT)
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A node module to edit a string with a users preferred text editor using $VISUAL or $ENVIRONMENT.
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Version: 3.1.0
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As of version 3.0.0, the minimum version of node supported is 4.
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## Install
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`npm install external-editor --save`
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## Usage
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A simple example using the `.edit` convenience method
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import {edit} from "external-editor";
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const data = edit('\n\n# Please write your text above');
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console.log(data);
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A full featured example
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import {ExternalEditor, CreateFileError, ReadFileError, RemoveFileError} from "external-editor"
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try {
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const editor = new ExternalEditor();
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const text = editor.run() // the text is also available in editor.text
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if (editor.last_exit_status !== 0) {
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console.log("The editor exited with a non-zero code");
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}
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} catch (err) {
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if (err instanceOf CreateFileError) {
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console.log('Failed to create the temporary file');
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} else if (err instanceOf ReadFileError) {
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console.log('Failed to read the temporary file');
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} else if (err instanceOf LaunchEditorError) {
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console.log('Failed to launch your editor');
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} else {
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throw err;
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}
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}
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// Do things with the text
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// Eventually call the cleanup to remove the temporary file
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try {
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editor.cleanup();
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} catch (err) {
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if (err instanceOf RemoveFileError) {
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console.log('Failed to remove the temporary file');
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} else {
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throw err
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}
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}
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#### API
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**Convenience Methods**
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- `edit(text, config)`
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- `text` (string) *Optional* Defaults to empty string
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- `config` (Config) *Optional* Options for temporary file creation
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- **Returns** (string) The contents of the file
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- Could throw `CreateFileError`, `ReadFileError`, or `LaunchEditorError`, or `RemoveFileError`
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- `editAsync(text, callback, config)`
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- `text` (string) *Optional* Defaults to empty string
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- `callback` (function (error, text))
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- `error` could be of type `CreateFileError`, `ReadFileError`, or `LaunchEditorError`, or `RemoveFileError`
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- `text`(string) The contents of the file
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- `config` (Config) *Optional* Options for temporary file creation
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**Errors**
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- `CreateFileError` Error thrown if the temporary file could not be created.
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- `ReadFileError` Error thrown if the temporary file could not be read.
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- `RemoveFileError` Error thrown if the temporary file could not be removed during cleanup.
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- `LaunchEditorError` Error thrown if the editor could not be launched.
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**External Editor Public Methods**
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- `new ExternalEditor(text, config)`
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- `text` (string) *Optional* Defaults to empty string
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- `config` (Config) *Optional* Options for temporary file creation
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- Could throw `CreateFileError`
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- `run()` Launches the editor.
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- **Returns** (string) The contents of the file
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- Could throw `LaunchEditorError` or `ReadFileError`
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- `runAsync(callback)` Launches the editor in an async way
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- `callback` (function (error, text))
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- `error` could be of type `ReadFileError` or `LaunchEditorError`
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- `text`(string) The contents of the file
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- `cleanup()` Removes the temporary file.
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- Could throw `RemoveFileError`
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**External Editor Public Properties**
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- `text` (string) *readonly* The text in the temporary file.
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- `editor.bin` (string) The editor determined from the environment.
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- `editor.args` (array) Default arguments for the bin
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- `tempFile` (string) Path to temporary file. Can be changed, but be careful as the temporary file probably already
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exists and would need be removed manually.
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- `lastExitStatus` (number) The last exit code emitted from the editor.
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**Config Options**
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- `prefix` (string) *Optional* A prefix for the file name.
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- `postfix` (string; *Optional* A postfix for the file name. Useful if you want to provide an extension.
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- `mode` (number) *Optional* Which mode to create the file with. e.g. 644
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- `template` (string) *Optional* A template for the filename. See [tmp](https://www.npmjs.com/package/tmp).
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- `dir` (string) *Optional* Which path to store the file.
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## Errors
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All errors have a simple message explaining what went wrong. They all also have an `originalError` property containing
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the original error thrown for debugging purposes.
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## Why Synchronous?
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Everything is synchronous to make sure the editor has complete control of the stdin and stdout. Testing has shown
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async launching of the editor can lead to issues when using readline or other packages which try to read from stdin or
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write to stdout. Seeing as this will be used in an interactive CLI environment, I made the decision to force the package
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to be synchronous. If you know a reliable way to force all stdin and stdout to be limited only to the child_process,
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please submit a PR.
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If async is really needed, you can use `editAsync` or `runAsync`. If you are using readline or have anything else
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listening to the stdin or you write to stdout, you will most likely have problem, so make sure to remove any other
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listeners on stdin, stdout, or stderr.
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## Demo
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[](https://asciinema.org/a/a1qh9lypbe65mj0ivfuoslz2s)
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## Breaking Changes from v2 to v3
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- NodeJS 0.12 support dropped.
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- Switched to named imports.
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- All "snake_cased" variables and properties are now "camelCased".
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- `ExternalEditor.temp_file` is now `ExternalEditor.tempFile`.
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- `ExternalEditor.last_exit_status` is now `ExternalEditor.lastExitStatus`.
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- `Error.original_error` is now `Error.originalError`.
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## License
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The MIT License (MIT)
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Copyright (c) 2016-2018 Kevin Gravier
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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