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An Emacs major mode for editing Elasticsearch requests
branch: master

Merge pull request #16 from noorul/replace-concat

Use format instead of concat
latest commit 5481b4a710
Lee Hinman authored

README.md

Elasticsearch mode for Emacs

Provides a major mode for editing ES query examples. Better highlighting and indention than sh-mode or js-mode.

It is intended to be a mixture of the three modes as well as mimicing some of the highlighting from Marvel's sense console.

You can also think of it as Marvel's Sense-envy for Emacs users.

Installation

es-mode is available in the MELPA repository. Do this, if MELPA isn't already in your sources:

(require 'package)
(add-to-list 'package-archives
             '("MELPA" . "http://melpa.milkbox.net/packages/" ))

Then run M-x package-refresh-contents to load the contents of the new repository, and M-x package-install RET es-mode RET to install es-mode.

Usage

(add-to-list 'load-path "/path/to/es-mode-dir")
(autoload 'es-mode "es-mode.el"
  "Major mode for editing Elasticsearch queries" t)
(add-to-list 'auto-mode-alist '("\\.es$" . es-mode))

You can now open a file with an .es extension and es-mode will automatically load..

Features

  • Highlighting for builtin queries, facets, aggregations, special paramaters
  • A company-mode backend for completing ES queries
  • Better indenting than sh-mode (indents like js-mode)
  • Sending the queries as a http-request to Elasticsearch endpoints.
  • navigate via goto-(next|previous)-request with C-c C-n and C-c C-p (when using parameters)
  • hooks for responses, see es-response-success-functions and es-response-failure-functions
  • pass the resulting JSON through jq to return only the values you want in org-mode

Example

You can specify requests with two different formats:

With parameters

In the document, specify parameters similar to Sense, like so:

POST /myindex/_search?pretty
{
  "query": {
    "match_all": {}
  }
}

Hitting C-c C-c anywhere on the parameter or body of the request will execute the request, opening a response buffer. The base-url can be configured by customizing the es-default-base var.

You also don't have to provide the leading "/", similar to Sense (I personally think the leading "/" looks better though), like this:

POST myindex/_search?pretty
{
  "query": {
    "match_all": {}
  }
}

Without parameters

Without any parameters, you can specify a request:

{
  "query": {
    "match_all": {}
  }
}

With the request region highlighted or inside the query structure, hit C-c C-c to execute it. The first time you do this you will be prompted for the URL and HTTP method. You can also set the URL with C-c C-u and the method with C-c C-m.

Screenshot

See test.es, test2.es, and all.org, here's a screenshot from my theme:

picture of es-mode

And here's an example of the completion of queries/filters:

picture of es-mode completion

Org-babel support

One of the main reasons I started this was better highlighting and indention for org-babel. So add the snippet below to your .emacs:

(org-babel-do-load-languages
 'org-babel-load-languages
 '((elasticsearch . t)))

And then you will be able to hit C-c C-c on code like this in your org-mode file:

#+BEGIN_SRC es
POST /_search?pretty
{
  "query": {
    "match_all": {}
  }
}
#+END_SRC

OR (without parameters):

#+BEGIN_SRC es :method POST :url localhost:9200/_search?pretty
{
  "query": {
    "match_all": {}
  }
}
#+END_SRC

org-mode uses the arguments :url and :method to know where and how to send a query. If they are not present org-mode will use es-default-url and es-defaul-request-method instead.

Tangling these blocks will produce <filename>.es, if you specify the filename with :tangle foo.sh, es-mode will instead create a curl request for the body of the request.

Passing JSON through jq

In org-mode you can also reduce the size of results by passing them through the jq command-line tool. For example, compare the output of these two different org blocks:

#+BEGIN_SRC es
GET /
{}
#+END_SRC

#+RESULTS:
#+begin_example
{
  "status" : 200,
  "name" : "Everyman",
  "version" : {
    "number" : "1.3.2",
    "build_hash" : "dee175dbe2f254f3f26992f5d7591939aaefd12f",
    "build_timestamp" : "2014-08-13T14:29:30Z",
    "build_snapshot" : false,
    "lucene_version" : "4.9"
  },
  "tagline" : "You Know, for Search"
}
#+end_example

And the same thing, but passed through the jq tool, extracting the "name" and "version.number" fields:

#+BEGIN_SRC es :jq .name, .version.number
GET /
{}
#+END_SRC

#+RESULTS:
: "Everyman"
: "1.3.2"

You can use this to return only a certain hit, or the score of a hit, etc, easily, so you can format the output as desired. See the full jq manual for how to use jq.

es-mode uses jq in the PATH, however, if you want to specify an absolute path you can customize the es-jq-path var as you like.

jq will only be run if the response is an HTTP 20[0-9].

Feedback

This is my first major mode for Emacs, feedback is welcome, especially pull requests that show me what I'm doing wrong.

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