/ Command-line Tools

Select files out of bash output

Select files out of bash output

PathPicker

Facebook PathPicker is a simple command line tool that solves the perpetual
problem of selecting files out of bash output. PathPicker will:

  • Parse all incoming lines for entries that look like files
  • Present the piped input in a convenient selector UI
  • Allow you to either:
    • Edit the selected files in your favorite $EDITOR
    • Execute an arbitrary command with them

It is easiest to understand by watching a simple demo:

Examples

After installing PathPicker, using it is as easy as piping into fpp. It takes
a wide variety of input -- try it with all the options below:

  • git status | fpp
  • hg status | fpp
  • git grep "FooBar" | fpp
  • grep -r "FooBar" . | fpp
  • git diff HEAD~1 --stat | fpp
  • find . -iname "*.js" | fpp
  • arc inlines | fpp

and anything else you can dream up!

Requirements

PathPicker requires Python >2.6 or >3.0.

Supported Shells:

  • Bash is fully supported and works the best.
  • ZSH is supported as well but won't have a few features like alias expansion in command line mode.
  • csh/fish/rc are supported in the latest version, but might have quirks or issues in older versions of PathPicker. Note however if your default shell and current shell is not in the same family (bash/zsh... v.s. fish/rc), you need to manually export environment variable $SHELL to your current shell.

Installing PathPicker

Homebrew

Installing PathPicker is easiest with Homebrew for mac:

  • brew update (to pull down the recipe since it is new)
  • brew install fpp

Linux

On debian systems, installation can be done by installing the debian package from here. To build the package locally, run these steps:

$ git clone https://github.com/facebook/PathPicker.git
$ cd debian
$ ./package.sh 
$ ls ../fpp_0.7.2_noarch.deb

On Arch Linux, PathPicker can be installed from Arch User Repository (AUR).
the AUR fpp-git package.

If you are on another system, or prefer manual installation, please
follow the instructions given below.

Manual Installation

However if you're on a system without Homebrew, it's still quite easy to install
PathPicker since it's essentially just a bash script that calls some Python. These
steps more-or-less outline the process:

  • cd /usr/local/ # or wherever you install apps
  • git clone https://github.com/facebook/PathPicker.git
  • cd PathPicker/

Here we make a symbolic link from the bash script in the repo
to /usr/local/bin/ which is assumed to be in the current
$PATH

  • ln -s "$(pwd)/fpp" /usr/local/bin/fpp
  • fpp --help # should work!

Add-ons

For tmux users, you can additionally install tmux-fpp which adds a key combination to run PathPicker on the last received stdout. It makes jumping into file selection mode even easier -- check it out here.

Advanced Functionality

As mentioned above, PathPicker allows you to also execute arbitrary commands with the specified files.
Here is an example showing a git checkout command executed against the selected files:

The selected files are appended to the command prefix to form the final command. If you need the files
in the middle of your command, you can use the $F token instead, like:

cat $F | wc -l

Another important note is that PathPicker by default only selects files that exist on the filesystem. If you
want to skip this (perhaps to selected deleted files in git status), just run PathPicker with the --no-file-checks (or -nfc for short) flag.

How PathPicker works

PathPicker is a combination of a bash script and some small Python modules.
It essentially has three steps:

  • First the bash script redirects all standard out in to a python module that
    parses and extracts out filename candidates. These candiates are extracted with a series of
    regular expressions, since the input to PathPicker can be any stdout from another program. Rather
    than make specialized parsers for each program, we treat everything as noisy input and select candidates via
    regexes. To limit the number of calls to the filesystem (to check existence), we are fairly restrictive on the
    candidates we extract.

This has the downside that files that are single words with no extension (like test) that are not prepended by
a directory will fail to match. This is a known limitation to PathPicker, and means that it will sometimes fail to find valid files in the input.

  • Next, a selector UI built with curses is presented to the user. Here you can select a few files to edit or input a command
    to execute.
  • Lastly, the python script outputs a command to a bash file that is later
    executed by the original bash script.

It's not the most elegant architecture in the world but (in our opinion) provides a lot of utility.

Documentation & Configuration

For all documentation and configuration options, see the output of fpp --help.

Join the PathPicker community

See the CONTRIBUTING file for how to help out.

GitHub