Projectile has two modes of operation - one is portable and is
implemented in Emacs Lisp(therefore it's native to Emacs and is known
native indexing method) and the other relies on external
git, etc to obtain the list of files in a
Since the native indexing mode is much slower, by default the second method is used on all operating systems except Windows. To force the use of native indexing in operating systems other than Windows:
(setq projectile-indexing-method 'native)
To force the use of external indexing in Windows:
(setq projectile-indexing-method 'alien)
This can speed up Projectile in Windows significantly. The disadvantage of this method is that it's not well supported on Windows systems. If there's problem, you can always use native indexing mode.
Since indexing a big project is not exactly quick (especially in Emacs Lisp), Projectile supports caching of the project's files. The caching is enabled by default whenever native indexing is enabled.
To enable caching unconditionally use this snippet of code:
(setq projectile-enable-caching t)
At this point you can try out a Projectile command such as C-c p f (M-x projectile-find-file RET).
Running C-u C-c p f will invalidate the cache prior to prompting you for a file to jump to.
Pressing C-c p z will add the currently visited file to the cache for current project. Generally files created outside Emacs will be added to the cache automatically the first time you open them.
The project cache is persistent and will be preserved during Emacs restarts.
You can purge an individual file from the cache with
M-x projectile-purge-file-from-cache or an
entire directory with
File exists cache
Projectile does many file existence checks since that is how it identifies a project root. Normally this is fine, however in some situations the file system speed is much slower than usual and can make emacs "freeze" for extended periods of time when opening files and browsing directories.
The most common example would be interfacing with remote systems using TRAMP/ssh. By default all remote file existence checks are cached
To disable remote file exists cache that use this snippet of code:
(setq projectile-file-exists-remote-cache-expire nil)
To change the remote file exists cache expire to 10 minutes use this snippet of code:
(setq projectile-file-exists-remote-cache-expire (* 10 60))
You can also enable the cache for local file systems, that is normally not needed but possible:
(setq projectile-file-exists-local-cache-expire (* 5 60))
Using Projectile everywhere
If you want Projectile to be usable in every directory (even without the presence of project file):
(setq projectile-require-project-root nil)
This might not be a great idea if you start Projectile in your home folder for instance. :-)
projectile-switch-project (C-c p p) Projectile invokes
the command specified in
projectile-switch-project-action (by default it is
Depending on your personal workflow and habits, you
may prefer to alter the value of
This is the default. With this setting, once you have selected your
project via Projectile's completion system (see below), you will
remain in the completion system to select a file to visit.
is capable of retrieving files in all sub-projects under the project root,
such as Git submodules. Currently, only Git is supported. Support for other VCS
will be added in the future.
projectile-find-file but lists all files in all known projects. Since
the total number of files could be huge, it is beneficial to enable caching for subsequent
If point is on a filepath, Projectile first tries to search for that file in project:
If it finds just a file, it switches to that file instantly. This works even if the filename is incomplete, but there's only a single file in the current project that matches the filename at point. For example, if there's only a single file named "projectile/projectile.el" but the current filename is "projectile/proj" (incomplete), projectile-find-file still switches to "projectile/projectile.el" immediately because this is the only filename that matches.
If it finds a list of files, the list is displayed for selecting. A list of files is displayed when a filename appears more than one in the project or the filename at point is a prefix of more than two files in a project. For example, if `projectile-find-file' is executed on a filepath like "projectile/", it lists the content of that directory. If it is executed on a partial filename like "projectile/a", a list of files with character 'a' in that directory is presented.
If it finds nothing, display a list of all files in project for selecting.
(setq projectile-switch-project-action 'projectile-dired)
With this setting, once you have selected your project, the top-level directory of the project is immediately opened for you in a dired buffer.
(setq projectile-switch-project-action 'projectile-find-dir)
With this setting, once you have selected your project, you will remain in Projectile's completion system to select a sub-directory of your project, and then that sub-directory is opened for you in a dired buffer. If you use this setting, then you will probably also want to set
(setq projectile-find-dir-includes-top-level t)
in order to allow for the occasions where you want to select the top-level directory.
By default Projectile uses
ido as its completion system.
extremely popular and it is built into Emacs.
As already noted above if you're going to use the
ido completion it's
extremely highly recommended that you install the optional
flx-ido package, which provides a much
more powerful alternative to
Another completion option is grizzl:
(setq projectile-completion-system 'grizzl)
grizzl's advantage is that it provides good fuzzy completion
ido's less than stellar built-in flex matching, but inferior to
Basic (Emacs's default)
If you don't like
grizzl you can use regular completion:
(setq projectile-completion-system 'default)
You might want to combine default completion with
icomplete-mode for optimum results.
Custom Completion Function
You can also set
projectile-completion-system to a function:
(setq projectile-completion-system 'my-custom-completion-fn) (setq projectile-completion-system (lambda (prompt choices) ;; ... ))
An example of a custom completion function is this one, which only show the file name (not including path) and if the file selected is not unique, another completion with names relative to project root appears.
To be able to regenerate a project's tags via
should install and add to the PATH
Exuberant Ctags instead of a plain ctags, which
ships with Emacs distribution.
Customizing project root files
You can set the values of
projectile-project-root-files-functions to customize how project roots are
To customize project root files settings:
M-x customize-group RET projectile RET
File-local project root definitions
If you want to override the projectile project root for a specific
file, you can set the file-local variable
can be useful if you have files within one project that are related to
a different project (for instance, Org files in one git repo that
correspond to other projects).
Storing project settings
From project to project some things may differ even in same language -
different coding styles, separate auto-completion sources, etc. If
you need to set some variables according to selected project, you can
use standard Emacs feature called
Per-Directory Local Variables. To
use it you must create file named
.dir-locals.el inside project
directory. This file must contain something like this:
((nil . ((secret-ftp-password . "secret") (compile-command . "make target-x") (eval . (progn (defun my-project-specific-function () ;; ... )))) (c-mode . (c-file-style . "BSD")))
The top-level alist member referenced with the key
nil applies to the
entire project. A key with the name
eval will evaluate its
arguments. In the example above, this is used to create a function. It
could also be used to e.g. add such a function to a key map.
You can also quickly visit the the
.dir-locals.el file with C-c
p E (M-x projectile-edit-dir-locals RET).
Here are a few examples of how to use this feature with Projectile.
Configuring Projectile's Behavior
Projectile offers many customizable variables (via
allows us to customize its behavior. Because of how
works, it can be used to set these customizations on a per-project basis.
You could enable caching for a project in this way:
((nil . ((projectile-enable-caching . t))))
If one of your projects had a file that you wanted Projectile to ignore, you would customize Projectile by:
((nil . ((projectile-globally-ignored-files . '("MyBinaryFile")))))
If you wanted to wrap the git command that Projectile uses to find list the files in you repository, you could do:
((nil . ((projectile-git-command . "/path/to/other/git ls-files -zco --exclude-standard"))))
If you want to use a different project name than how Projectile named your project, you could customize it with the following:
((nil . ((projectile-project-name . "your-project-name-here"))))
Configure a Project's Compilation, Test and Run commands
There are a few variables that are intended to be customized via
- for compilation -
- for testing -
- for running -
They're all set to
nil by default, but by setting them you'll override the
default commands per each supported project type.
These variables can be strings to run external commands or Emacs Lisp functions:
(setq projectile-test-cmd #'custom-test-function)
Projectile can be configured to run the hook
projectile-idle-timer-hook every time Emacs is in a project and has
been idle for
projectile-idle-timer-seconds seconds (default is 30
seconds). To enable this feature, run:
M-x customize-group RET projectile RET
projectile-enable-idle-timer to non-nil. By default,
additional functions to the hook using
(add-hook 'projectile-idle-timer-hook 'my-projectile-idle-timer-function)
Mode line indicator
By default the minor mode indicator of Projectile appears in the form
" Projectile[ProjectName]". This is configurable via the custom variable
projectile-mode-line, which expects a sexp like
'(:eval (format " Proj[%s]" (projectile-project-name))).
The project name will not appear by default when editing remote files (via TRAMP), as recalculating the project name (this is done on every keystroke) is a fairly slow operation there.