2018-05-18 03:34:24 +00:00
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#+TITLE: Tern layer
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[[file:img/tern.png]]
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* Table of Contents :TOC_4_gh:noexport:
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- [[#description][Description]]
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- [[#features][Features:]]
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- [[#install][Install]]
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- [[#configuration][Configuration]]
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- [[#custom-tern-command][Custom tern command]]
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- [[#re-use-the-server-across-multiple-different-editing-sessions][Re-use the server across multiple different editing sessions]]
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- [[#key-bindings][Key Bindings]]
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* Description
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This layer adds support for [[http://ternjs.net/][tern]] stand-alone code-analysis engine for
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JavaScript.
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** Features:
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- TODO: list the feature of tern supported by tern package
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* Install
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To use this configuration layer, add it to your =~/.spacemacs=. You will need to
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add =tern= to the existing =dotspacemacs-configuration-layers= list in this
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file.
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You can install =tern= globally with the following command:
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2018-07-10 10:57:25 +00:00
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2018-05-18 03:34:24 +00:00
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#+BEGIN_SRC sh
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$ npm install -g tern
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#+END_SRC
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* Configuration
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** Custom tern command
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Windows users may need to set the variable =tern-command= in order for emacs to
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locate and launch tern server successfully. See [[https://github.com/syl20bnr/spacemacs/issues/5733][this open issue for more
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details]]. The variable can be set by adding the =tern= layer with this
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configuration layer:
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#+BEGIN_SRC emacs-lisp
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(tern :variables tern-command '("node" "/path/to/tern/bin/tern"))
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#+END_SRC
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Note: =tern-command= must be a list of strings.
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** Re-use the server across multiple different editing sessions
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By default =tern= is setup to not create multiple =.tern-port= files in your
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repository.
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To make tern re-use the server across multiple different editing sessions (thus
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creating multiple =.tern-port= files for each document you have open [[http://ternjs.net/doc/manual.html][see here
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for more details]]) set the variable =tern-disable-port-files= to nil:
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#+BEGIN_SRC emacs-lisp
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(tern :variables tern-disable-port-files nil)
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#+END_SRC
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* Key Bindings
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| Key Binding | Description |
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|---------------+------------------------------------------------------------------------------------------|
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| ~SPC m C-g~ | brings you back to last place you were when you pressed M-.. |
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| ~SPC m g g~ | jump to the definition of the thing under the cursor |
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| ~SPC m g G~ | jump to definition for the given name |
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| ~SPC m h d~ | find docs of the thing under the cursor. Press again to open the associated URL (if any) |
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| ~SPC m h t~ | find the type of the thing under the cursor |
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| ~SPC m r r V~ | rename variable under the cursor using tern |
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