Awesome
dumb-jump
About
Dumb Jump is an Emacs "jump to definition" package with support for 50+ programming languages that favors "just working". This means minimal -- and ideally zero -- configuration with absolutely no stored indexes (TAGS) or persistent background processes. Dumb Jump requires at least GNU Emacs 24.3
.
How it works
Dumb Jump uses The Silver Searcher ag
, ripgrep rg
, or grep
to find potential definitions of a function or variable under point. It uses a set of regular expressions based on the file extension, or major-mode
, of the current buffer. The matches are run through a shared set of heuristic methods to find the best candidate to jump to. If it can't decide it will present the user with a list in a pop-menu, helm, or ivy (see dumb-jump-selector
).
Success Rate
For the currently supported languages it seems to do a good job of finding what you want. If you find a case where it does not work as expected do not hesitate to open an issue. It can be slow if it needs to use grep
and/or a project is large. Although it can be sped up by installing ag
or installing rg
and/or creating a .dumbjump
file in your project's root directory with paths that should be excluded (see configuration).
Supported Languages
There is currently basic support for the following languages:
- Apex
- Bash
- C/C++
- C#
- Clojure
- CoffeeScript
- Common Lisp
- Coq
- Crystal
- Dart
- Elixir
- Emacs Lisp
- Erlang
- F#
- Faust
- Fennel
- Fortran
- Go
- Groovy
- Haskell
- Java
- JavaScript
- Julia
- Kotlin
- LaTeX
- Lua
- Matlab
- Nim
- Nix
- Objective-C
- OCaml
- OpenSCAD
- Org mode
- Pascal
- Perl
- PHP
- Protocol Buffers
- Python
- R
- Racket
- Ruby
- Rust
- Sass
- Scala
- Scheme
- SML
- Solidity
- SQL
- Swift
- SystemVerilog
- Tcl
- Terraform / HCL
- TypeScript
- Vala
- VHDL
- Zig
If you have any issues with the existing languages, or you want support for another one, then please open an issue. PRs are also welcome. If you'd like to add a language these PRs for lua and rust are good examples.
Installing
The recommended way to install Dumb Jump is via package.el
. It's available on MELPA: <kbd>M-x</kbd> package-install dumb-jump
Spacemacs
If you're using an up-to-date Spacemacs, then you already have Dumb Jump by default just make sure you install ag
or rg
(see below) to ensure you have the best experience.
Installing ag
or rg
Dumb Jump performs best with The Silver Searcher ag
(ag install instructions) or ripgrep rg
(rg install instructions) installed on your system.
Usage
Basic
To enable the xref backend, evaluate
(add-hook 'xref-backend-functions #'dumb-jump-xref-activate)
or add it to your initialisation file. Using this, you can now use <kbd>M-.</kbd> (or <kbd>gd</kbd> when using Evil).
Xref can be customized to use completing-read
to select a
target. That way a completion framework of your choice (Icomplete,
Helm, Ivy, ...) will be used instead of the default pop-up buffer. To
do this, evaluate
(setq xref-show-definitions-function #'xref-show-definitions-completing-read)
Note that the function xref-show-definitions-completing-read
requires at least Xref 1.1.0. This can either be downloaded from ELPA
or is bundled with Emacs 28.1 or newer.
Configuration
Excluding project directories
Dumb Jump will automatically look for a project root. If it's not finding one then either put a .dumbjump
file in your project root and optionally add excluded directories to make it faster.
Project root directory denoters: .dumbjump
.projectile
.git
.hg
.fslckout
.bzr
_darcs
.svn
Makefile
PkgInfo
-pkg.el
.
If you want to stop a directory from registering as the project root (and have Dumb Jump keep looking) add an empty .dumbjumpignore
file in that directory.
Example .dumbjump
-tests
-node_modules
-build
-images
+../some-lib/src
+/usr/lib/src
NOTE When adding paths outside of the project (using +
) ensure you use dumb-jump-force-searcher
of either 'ag
or 'rg
(see below). This is required because the default searcher (git-grep
) won't be able to search outside of the project root. This edge case will be fixed in a future release. That is, git-grep
will NOT be set as the default searcher if a .dumbjump
is present with a +
path outside of the repo.
.emacs
options
(setq dumb-jump-default-project "~/code")
to change default project if one is not found (defaults to~
)(setq dumb-jump-quiet t)
if Dumb Jump is too chatty.- To support more languages and/or definition types customize
dumb-jump-find-rules
variable. (setq dumb-jump-force-searcher 'rg)
to force the search program Dumb Jump should use. It will always use this searcher. If not set (nil
) Dumb Jump will usegit-grep
if it's a git project and if not will try searchers in the following orderag
,rg
,grep
(first installed wins). This is necessary if you want full control over the searcher Dumb Jump uses.(setq dumb-jump-prefer-searcher 'rg)
to let Dumb Jump know your searcher preference. If set this will still usegit-grep
if it's a git project (because it's the fastest), but will you use whatever you set here in any other situation. If not set Dumb Jump will follow the same order as mentioned in thedumb-jump-force-searcher
description. At this time setting this value is only necessary if you preferrg
but haveag
installed too.(setq dumb-jump-git-grep-search-args "")
to set additional command line arguments when using git-grep for searching (defaults to""
).(setq dumb-jump-ag-search-args "")
to set additional command line arguments when using ag for searching (defaults to""
).(setq dumb-jump-rg-search-args "")
to set additional command line arguments when using rg for searching (defaults to"--pcre2"
).
If your project has multi-line method signatures you should use ag
or rg
version 0.10.0
or higher.
To learn more about how Dumb Jump picks a searcher see this issue and this pull request.
Hydra for effieciency
If you have Hydra installed, the following is an example hydra for easily using Dumb-Jump and not needing to remember the bindings or function names:
(defhydra dumb-jump-hydra (:color blue :columns 3)
"Dumb Jump"
("j" dumb-jump-go "Go")
("o" dumb-jump-go-other-window "Other window")
("e" dumb-jump-go-prefer-external "Go external")
("x" dumb-jump-go-prefer-external-other-window "Go external other window")
("i" dumb-jump-go-prompt "Prompt")
("l" dumb-jump-quick-look "Quick look")
("b" dumb-jump-back "Back"))
It can be explicitly bound or used inside another hydra (if you already use something like Avy/Ace or similar for general "jumping").
Debugging a jump
- <kbd>M-x</kbd>
set-variable dumb-jump-debug t
- try to jump
- go to buffer
*Messages*
More details here. Thanks to @cweiske and @Glumanda99
Obsolete commands and options
Older versions of dumb jump didn't use xref, and instead had custom commands. These, while marked obsolete, can still be used:
dumb-jump-go
(former) core functionality. Attempts to jump to the definition for the thing under point. This has been replaced in the new interface withxref-find-definitions
(<kbd>M-.</kbd>).dumb-jump-back
jumps back to where you were when you jumped. These are chained so if you go down a rabbit hole you can get back out or where you want to be. This has been replaced withxref-pop-marker-stack
(<kbd>M-,</kbd>), but is mostly equivalent.dumb-jump-quick-look
likedumb-jump-go
but only shows tooltip withfile
,line
, andcontext
it does not jump.dumb-jump-go-other-window
exactly likedumb-jump-go
but usesfind-file-other-window
instead offind-file
dumb-jump-go-prefer-external
likedumb-jump-go
but will prefer definitions not in the current bufferdumb-jump-go-prefer-external-other-window
expected combination ofdumb-jump-go-prefer-external
anddumb-jump-go-other-window
dumb-jump-go-prompt
exactly likedumb-jump-go
but prompts user for function to jump to
A few user options only have an effect when used with the legacy interface. These are:
dumb-jump-after-jump-hook
(usexref-after-jump-hook
instead)dumb-jump-before-jump-hook
(usexref-after-return-hook
instead)dumb-jump-selector
dumb-jump-aggressive
dumb-jump-use-visible-window
dumb-jump-confirm-jump-to-modified-file
The minor mode dumb-jump-mode
binds a few of these commands by
default.
If you still use Emacs 24 or older, you won't have xref, and have to use the legacy interface instead. In that case, there will also be no "obsolete" warnings.
Why?
I wanted "jump to definition" functionality to "just work" in emacs. I use IntelliJ for Java and this functionality is basically the only thing I miss when I switch back to emacs for work in other languages. There are certainly other packages that offer this type of functionality, but they all require significantly more configuration and are often limited to a particular language. An alternative may be worth setting up if you are in a specific project or language often (see alternatives).
Contributing
Feedback is very welcome via GitHub issues. I will consider supporting other languages either via issue request or PR. If submitting a PR then please add tests as well.
Running Tests
Opening a PR will use CircleCI to run all the tests against all the supported emacs versions and search programs.
Running tests locally
There are a lot of options for running the tests locally:
Basic/Classic
requires Cask using your local emacs
cd /path/to/dumb-jump
cask
make test
Concurrent
requires golang and Cask using your local emacs
cd /path/to/dumb-jump
cask
make test-concurrent
Docker (latest emacs)
only requires docker and runs tests against emacs 26.1
cd /path/to/dumb-jump
cask
make test-in-docker
Docker (all supported emacs versions)
only requires docker and runs tests against all supported emacs versions
cd /path/to/dumb-jump
cask
make test-all-in-docker
Alternatives
Here is a list of potential alternative packages for emacs:
- Tags supports multiple languages
- GNU Global supports multiple languages
- Tern for JavaScript
- elpy for Python
- robe for Ruby
Most of these were sourced from this emacs StackExchange answer.