Open files or URLs using associated programs. http://github.com/akc/opn

Latest on Hackage:0.1.2

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD3 licensed by Anders Claesson
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The opn command lets you open files and URLs with associated programs. It's intended to "just work" and to be trivial to configure. Its configuration resides in ~/.opnconfig; here's an example:

browser: chromium

mupdf:    .pdf
emacs:    .lhs .hs .py .c
chromium: .png .jpg .html .txt
mpv:      .avi .mpg .mp4
djview:   .djvu

With this configuration, PDFs would open in mupdf; Haskell, Python and C source files in emacs, etc. If asked to open a file with no matching extension, or a file without an extension, opn tries to be a bit smart. If, for example, one runs

opn foo.h

then the header file foo.h would be opened in emacs. The reason is that such files have mime type text/x-c, and, as files with the extension '.c' shares this mime type, opn "guesses" that '.h' files also should be opened with emacs.

Both [browser] and [associations] sections must be present and nonempty in ~/.opnconfig. The [browser] section should in fact always have exactly one key, namely browser. So a (close to) minimal configuration looks something like this:

browser: chromium

chromium: html

The browser is used for URLs and as a fallback, so with this configuration all files and URLs would open in chromium.

Talking of chromium: on Linux chromium opens downloads using xdg-open. This works pretty well if you are using a full desktop environment like GNOME, KDE or Xfce, but less so if you are running a light window manager such as i3 or xmonad. We can, however, exploit a behavior of xdg-open to effectively replace it with opn. As a fallback, when no supported desktop session is running, xdg-open uses $BROWSER. Thus putting

export BROWSER=opn

in your .bashrc, or something similar for your favorite shell, will "trick" chromium and xdg-open into using opn. This is my own main use for opn.

For further info see the man page: https://github.com/akc/opn/blob/master/opn.md.

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