Jump-Location: A cd that learns

If you spend any time in a console you know that cd is by far the most common command that you issue. I'll open up a console to it's default location in C:\Users\tkellogg or C:\Windows\system32 and then issue a cd C:\work\MyProject. Set-JumpLocation is a cmdlet lets you issue a j my to jump directly to C:\work\MyProject.

It learns your behavior by keeping track of how long you spend in certain directories and favoring them over the ones you don't care about. You don't have to use Jump-Location as a replacement for cd. Use cd to go local, and use Set-JumpLocation to jump further away.

Jump-Location is a powershell implementation of autojump.

How it knows where you want to go

It keeps track of how long you stay in a directory and builds a database. When you use the Set-JumpLocation or j command, it looks through the database to find the most likely directory and jumps there. You should only need to give it a 2-3 character hint. For instance, on mine I can do:

• j de -> C:\Users\tkellogg\code\Jump-Location\bin\Debug
• j doc -> C:\Users\tkellogg\Documents

What if you have several projects and you want to get to the Debug directory of one that you don't use very often? If you're jumpstat looks like this:

255    C:\Users\tkellogg\code\Jump-Location\bin\Debug
	50     C:\Users\tkellogg\code\MongoDB.FSharp\bin\Debug

Using j de will jump to Jump-Location\bin\Debug. But use something like j mo d if you really want to go to MongoDB.FSharp\bin\Debug. You can issue a j mo d. mo matches MongoDB.FSharp and d matches Debug.

j internally calls Push-Location, so you can navigate back in your visited locations stack with popd or special Jump-Location query j -.

Quick Primer on jumpstat

You can use jumpstat to see what's in the database. In tradition with autojump, the database is saved to ~\jump-location.txt. You can open up that file and make changes. The file will auto-load into any open powershell sessions.

Since we're in Powershell (and not legacy Bash) jumpstat returns objects. This means that you don't ever have to know anything about ~\jump-location.txt. You can manipulate the objects it returns. For instance, this is valid:

PS> $stats = jumpstat
PS> $stats[10].Weight = -1
PS> jumpstat -Save

Setting a weight to a negative number like that will cause it to be blacklisted from all jump results. Use the jumpstat -All option to see negative weights included in the jumpstat result set.

When you remove/rename directories, Jump-Location database can become out of sync with the file system. Your top-choice will pointed to an invalid location. You can cleanup database with jumpstat -cleanup. It will remove all records with non-existing paths.

Jumpstat can also be used with the "scan" parameter (jumpstat -scan) to recursively scan sub-directories into the database with 0 Weight. This is a quick way to teach Jump-Location about related directories without having to manually cd'ing to each one individually.

Add all subfolders of the current directory:

jumpstat -scan . 

Installation

Important: Jump-Location requires PowerShell version 3 or higher. Older installations of Windows 7 may only have PowerShell version 2. How to update powershell.

Recommended: Install from psget.net:

Install-Module Jump.Location

There is also a Chocolatey package for Jump-Location. To install via Chocolaty

choco install Jump-Location

Otherwise you can still install it manually.

1. Download the latest release.
2. Open properties for zip file and click "Unblock" button if you have one.
3. Unzip
4. Open a PowerShell console
5. Run .\Install.ps1. You may need to allow remote scripts by running Set-ExecutionPolicy -RemoteSigned. You may also have to right-click Install.ps1 and Unblock it from the properties window. Alternative: Add line Import-Module $modules\Jump-Location\Jump.Location.psd1 to your $PROFILE, where $modules\Jump-Location is a path to folder with module.

Next time you open a PowerShell console Jump-Location will start learning your habits. You'll also have access to the j and jumpstat aliases.

If you get errors after installation, try unblocking the file Jump.Location.dll manually by one of the following methods to clear the "untrusted" flag:

1. Copy the file to a FAT32 file system (such as a memory card) and back.
2. Run cmd /c "echo.>Jump.Location.dll:Zone.Identifier"

If you find any bugs, please report them so I can fix them quickly!

Build from source

From root directory:

1. Run msbuild .
2. Run .\copyBuild.ps1

In directory Build you will have local build of module.

TODO

1. Local search. j . blah will only match dirs under cwd. Using . will also search outside the DB.
2. Better PS documentation

References

1. old releases.