Pv makes installing site-wide python tools easy. It automatically pip installs a package into its own virtualenv, and then updates $PATH to include the installed binaries.
Copy/symlink the pv executable into /usr/bin/. Better installation coming soon...
Macintosh:~ tpetr$ pv httpie==0.5.0
----> creating virtualenv httpie
New python executable in /Users/tpetr/.pv/virtualenvs/httpie/bin/python
Installing setuptools............done.
Installing pip...............done.
----> installing / upgrading httpie==0.5.0
Downloading/unpacking httpie==0.5.0
Using download cache from /Users/tpetr/.pip_cache/http://pypi.python.org/packages/source/h/httpie/httpie-0.5.0.tar.gz
Running setup.py egg_info for package httpie
Downloading/unpacking requests>=1.0.4 (from httpie==0.5.0)
Using download cache from /Users/tpetr/.pip_cache/http://pypi.python.org/packages/source/r/requests/requests-1.2.2.tar.gz
Running setup.py egg_info for package requests
Downloading/unpacking Pygments>=1.5 (from httpie==0.5.0)
Using download cache from /Users/tpetr/.pip_cache/http://pypi.python.org/packages/source/P/Pygments/Pygments-1.6.tar.gz
Running setup.py egg_info for package Pygments
Installing collected packages: httpie, requests, Pygments
Running setup.py install for httpie
Installing http script to /Users/tpetr/.pv/virtualenvs/httpie/bin
Running setup.py install for requests
Running setup.py install for Pygments
Installing pygmentize script to /Users/tpetr/.pv/virtualenvs/httpie/bin
Successfully installed httpie requests Pygments
Cleaning up...
----> collecting executables
- http
- pygmentize
----> complete
add this line to your .bashrc / .zshrc:
[ -f "/Users/tpetr/.pv/env.sh" ] && source "/Users/tpetr/.pv/env.sh"
add line, reload shell
Macintosh:~ tpetr$ http
usage: http [--json] [--form] [--pretty {all,colors,format,none}]
[--style STYLE] [--print WHAT] [--verbose] [--headers] [--body]
[--stream] [--output FILE] [--download] [--continue]
[--session SESSION_NAME | --session-read-only SESSION_NAME]
[--auth USER[:PASS]] [--auth-type {basic,digest}]
[--proxy PROTOCOL:HOST] [--follow] [--verify VERIFY]
[--timeout SECONDS] [--check-status] [--help] [--version]
[--traceback] [--debug]
[METHOD] URL [REQUEST ITEM [REQUEST ITEM ...]]
http: error: too few arguments