Initialising packrat for new project so it contains existing packages - r

I want to start using package management for R projects. I am trying to use the packrat package. When I start a new project, I select the "Use packrat with this project" in the GUI. Or I could use packrat::init(). Both work OK. However, unless I am misunderstanding, this only initialises with a selection of packages which means I have to re-install lots of packages manually?
For example, after starting a project from scratch I have to re-install ggplot2 or pool or many others manually but not e.g. dplyr or DBI.
My question is, can I edit the list of standard packages that get initialised for a new project? Otherwise, for every new project I create I will have to go through and manually install lots of packages. I feel like I am missing a crucial step somewhere?

I would say create a new directory call the directory: "Quickstart."
Then install packrat and all the libraries you want to use into Quickstart.
Then when you want to start new project:
copy/paste the Quickstart/packrat folder into your new project directory
copy/paste the Quickstart/.Rprofile file into your new directory
Now your new project should have all the starting libraries and packrat initiated.

Related

How to Disable download missing package each time in meteor?

I tried to create meteor web application, but meteor download missing package each time when I change my code, and it was unnecessary.
So, can I config it only runs at the first time?
Thanks!
Could you add the actual message on the package it tries to download? Anyway, there are two potential locations where meteor looks for packages that need to be installed.
This is which each Meteor application and it's using Meteor Atmosphere packages. You can find these at .meteor folder in your project root file called packages path ./meteor/packages
Other potential place is packages.json in project root. It exists if you have used npm install or meteor npm install within the project.
Deleting unnecessary packages from these files should do the trick.

Hot swap of local Meteor package

I am using local Meteor package for my app (not posted on Atmosphere.js).
When I update this package elsewhere, I proceed with the following:
Update version of the package.
Delete old package from /packages/ directory of the live app.
See my program search for packages 3(?) times and then crash:
Your app is crashing. Here's the latest log:
Errors prevented startup:
While selecting package versions:
error: unknown package in top-level dependencies: vladimir3000:testpack
Your application has errors. Waiting for file change.
Copy new package with new version.
See my app picking up the changes and going live again:
vladimir3000:testpack upgraded from 0.0.2 to 0.0.3
=>Meteor server restarted
Is there a way to avoid step 3 and more elegantly instruct meteor to replace one package with another. Meteor update would not work as the package is not on atmosphere.js. Or hot swap is something from SOA world not from blood and fibers of Meteor javascript?
You can simply paste over the files for the package.
When you delete the old package, Meteor sees a file change and rebuilds the app. Since the package no longer exists in the packages directory, Meteor will try to pull it down from Atmosphere since it sees that there is a dependency on vladimir3000:testpack in .meteor/packages.
It will attempt to resolve this dependency a few times, with each build failing because the package you are referencing is unknown.
You can stop meteor and delete and replace the folder. Or you can copy and paste over the folder. The second method is preferable because Meteor will simply rebuild with all of the new files, rather than rebuilding and trying to resolve the dependency using Atmosphere.

Meteor packages -- how does it work?

I downloaded a Meteor Starter project called MeteorAdmin.
In the root of its directory tree, you find a packages directory that contains few packages (boostrap, comments, few others) and also, in the .meteor directory there's a file called packages that defines the dependencies of this project.
What is the difference between them? What I found interesting is that .meteor/packages contains bootstrap as well. In theory shouldn't that be enough so that bootstrap would get downloaded to the project?
The meteor packages file simply lists all of the apps dependencies as well as the load order of each (top to bottom). You can edit this file if you know what you are doing, but it's probably better to leave it alone until you are more familiar with Meteor.
The way you add packages is by typing meteor add <package-name> in your terminal and then it will be added to your project. Additionally, the name of the package will be added to the bottom of your packages file.
A meteor app can have local packages that are defined in the packages folder of the root directory. This project likely is implementing it's own bootstrap package and then added it with the meteor command I listed above. Once a local package is added to your project with the meteor add command it's package name will appear in the packages file just like packages from Atmosphere. I hope that answers your question... Let me know if you were looking for something more specific.

How To modify quantmod package with GIT

I currently have quantmod installed. I would like to modify the source code.
Do I need to uninstall the current version?
I currently was trying
(1) Installed GIT
(2) then I went to New Project>> Version Control >>create a new project form version control GIT and when I click that I get this error
"Git was not detected in the system path. to create projects from GIT repositories you should install GIT and then restart Rstudio. Not tha tif GIT is installed an not on the path then you can specify its location using the options dialog."
(3) So I went to the global options>>GIT/SVN>>Git executable and put this path
C:\Users\me\AppData\Local\Programs\Git\bin\git.exe
(4) then I restarted RSTUDIO and now I get further so when I go to
New Project>> Version Control >>create a new project form version control GIT>>CLONE GIT REPISITORY
Here it asks for a Repository URL, Project Directory name, and Create project as subdirectory of. Here is where I am unsure where I need to put this project so that the modification I make to the quantmod package will be picked up by my version of R
For Repository URL I was going ot put:
https://github.com/joshuaulrich/quantmod
For Project Directory I am unsure: can you advise??
For Create project as sub directory I am unsure: can you advise??
My R libraries are here: C:\Users\me\Documents\R-3.1.2\library
Also currently I have quantmod installed here:
C:\Users\me\Documents\R-3.1.2\library\quantmod
Do I need to uninstall that current version?
Appendix:
On My computer GIT is here: C:\Users\Me\AppData\Local\Programs\Git
On My computer R is here: C:\Users\Me\Documents\R-3.1.2
The project directory is just the name of the folder you will be putting the repo inside. Generally it is the name of package to make things clear. In your case quantmod.
The sub directory you can ignore unless you want to choose some other location (besides the current directory) for you code.
You don't need to uninstall the current version. My usual recommendation is to just increment the subversion of the package in the DESCRIPTION file. For example, increment:
Version: 1.0.1
to
Version: 1.0.2
Now when you rebuild and install you will have the new version. If you need the original again, you can just reinstall the old one (i.e. install.packages). Having both installed at the same time would likely result in conflicts between the packages and just causing a headache.

How to re-use an already installed package in Meteor?

I installed couple of packages for 'Project A' (e.g bootstrap) assuming that it will be available for all subsequent projects. But when a new meteor project 'Project B' was created, meteor list showed only default packages. So my assumption that meteor packages are like ruby gems available globally is incorrect. As I work offline every now and then, Is there a way I can manually copy/re-use installed packages?
Yes they are similar to gems. Packages are installed in ~/.meteor/packages, in precompiled form. They can be installed globally this way.
When you add a package to your project it will essentially copy the package from there into your build-cache directory hidden in the .meteor directory of your project.
To install a package locally where you can easily re-use it you would have to clone the github repository of the package and place the output in the /packages directory of your Meteor app.
For example for bootstrap, twbs:bootstrap you would clone this reposistory: https://github.com/twbs/bootstrap, into a directory like /packages/twbs:bootstrap (name doesn't matter if its defined in the package.js file on the repository.
In general you can easily re-use a package without the hassle of adding it in manually like so. It's better to use the global packages which are kept up to date.
The trouble comes with being offline. If you use a local package its nearly guaranteed to always work. Whereas the global ones can give a bit of trouble once in a while when you try to add a package in as meteor tries to check the package is up to date, especially where npm packages are involved with the package.
To keep it short if you added a package in using meteor add twbs:bootstrap you should most likely be able to add it to another project using the same command. Only if you keep your packages & meteor up to date.

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