The default layout for installed Haskell components follows the conventions of most unix-like systems. On Mac OS X, this layout isn't optimal, and a different layout is used. The layout presented here has several advantages:
- Follows Apple's Guidelines for file system layout
- Makes it easy for a user to locate all the Haskell components, especially user installed packages
- Enables easy removal of a user installed package, whether they have installed it --user or --global.
- Facilitate creation of unified, hyper-linked Haddock documentation, optionally with source
Ensure you have a JDK installed, if not, download here (For 64-bit Intel Macs, download Java for Mac OS X 10.5, Update 1. For the latest version of Mac OS, use the Software Update feature) Download the file for OS X on the Downloads page; Double-click the SQL Developer icon. Install Maven on Mac. Maven is the most widely used build and project dependency management tool for Java-based applications. We can install Maven on Mac OS using a package manager such as HomeBrew or through XCode Command Line Tools.
Haskell Platform 2011.2.0.0 (March 2011) and later uses this layout and sets up cabal to use it for built packages. On new installs, if you didn't already have a ~/.cabal/config file, then it is set up by default. Otherwise, the config file for this layout is placed in ~/.cabal/config.platform and you can manually move it over, or incorporate it into your existing config file.
Implementations
Haskell implementations are generally installed for use by all accounts on thesystem. They consist of large collections of executables, libraries, and otherfiles. These are packaged using Apple's framework, versioning, and bundlingtechniques and installed in:
For example, GHC 7.0.2 is installed in:
Executables intended for use from the command line, are be symlink'd into:
[Q: Would /usr/local/bin be more appropriate? ]
Packages that come with the implementation, are be located within the Frameworkbundle.
If the implementation has any GUI applications, these are installed in:
NB: These guidelines allow for multiple implementations and multipleversions to co-exist. (With the exception of multiple versions of GUI applicationswhich can only be done by distinct naming, and the symlinks in /usr/binwhich can achieved in the normal way: Append the version number to the executableand then symlink the 'bare' name to the most recent.
If implementations want to be able to be installed 'per user', then the abovepaths should be:
Not all software for Mac OS X offers a 'per user' option on installation, and whilenice, it is by no means universal.
User Installed Packages
User installed packages are placed under a 'prefix' that depends on if the userchoose to install for all users (--global) for just their own use (--user):
Package Component Layout
Cabal offers a large amount of flexibility in where the various pieces of a packageare installed. The GHC package system is rather agnostic about where these pieces are,and insulates the implementation from such differences. These combine to enable thechoice of package layout to be largely to serve the user.
For both --global and --user installs, this is the recommended package layout on Mac OS X:
This can be achieved with the following cabal configuration defaults:
N.B.:
- Cabal configuration files don't actually support ~. You must replace that with /Users/xxx where xxx is your account name.
- All packages for a given compiler are under a single directory. When an old compiler is removed, all the packages compiled for it can be easily removed too.
- All components for a package are under a single directory. This facilitates easy location and removal of a single package, for either a single compiler, or all installed versions.
- If a package generates different doc for different compilers (it may have different APIs available), then this structure preserves each.
- Executables are also per compilation, which is sometimes important (for Haddock, for example).
Executables
Packages that build executables to be run from the command line present a difficultly. They are built into a per-package bin directory, and then should be symlink'd somewhere on the user's PATH. For global installs, the logical place is one of:
For user installs, since ~/bin is not on the PATH by default on Mac OS X and may not exist, binaries are symlink'd into:
Alas, cabal only supports one location for both kinds of build, and so it is set to be the later.
References
I have been a Mac user for quite some time. There are three web browsers such as Safari, Google Chrome and Mozilla Firefox which I use the most on my Mac. While Safari is easily the top-notch choice for me, Chrome and Firefox are highly impressive as well.
I download a number of files regularly. By default, all the downloaded files are saved in the Download folders. But, what if you want to save any file to a specific location? You can easily change the download location on Mac.
We have already made a post on how to change Safari’s download location on Mac. And now, we are all set to walk you through the steps to change the download location in Chrome and Firefox. Let’s sail through!
How to Change Download Location in Chrome on Mac
Step #1. Launch Chrome on your Mac.
Step #2. Next up, you have to click on Menu icon from the top right corner.
Step #3. Click on Settings.
Step #4. Click on Show advanced settings and then scroll down to the “Downloads” section.
Step #5. Click on Change and select where you would want your downloaded files to be saved.
If want to choose a particular location for each download, you need to select the “Ask where to save each file before downloading” checkbox.
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How to Change Download Folder in Mozilla Firefox on Mac
Step #1. Open Firefox on your Mac.
Step #2. Click on the menu icon from the top right corner.
Step #3. Select Preferences. (Alternately, you can also click on the Firefox menu at the top Mac bar, and then select Preferences.)
Step #4. Next, you have to click on Choose button at the far right.
Step #5. Now, you need to select the location that you want to set as the Default Download Location.
If you want to choose the download location each time you download, select Always ask me where to save files.
That’s it!
Which is your favorite web browser? How much do you use Safari on your Mac? Is Chrome the best in the world? Let us know your view in the comment section.
Jignesh Padhiyar is the co-founder of iGeeksBlog.com who has a keen eye for news, rumors and all the unusual stuff that happens around Apple products. During his tight schedule, Jignesh finds some moments of respite to share side-splitting contents on social media.
Windows Download For Mac
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