derf / Feh
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Feh – Image viewer and Cataloguer
feh is a light-weight, configurable and versatile image viewer. It is aimed at command line users, but can also be started from graphical file managers. Apart from viewing images, it can compile text and thumbnail listings, show (un)loadable files, set X11 backgrounds, and more.
Features include filelists, various image sorting modes, custom action scripts, and image captions. feh can be controlled by configurable keyboard and mouse shortcuts, terminal input and signals. When no file arguments or filelists are specified, feh displays all files in the current directory.
For more information, please refer to the feh website or read the feh manual.
Dependencies
- Imlib2
- libcurl (disable with make curl=0)
- libpng
- libX11
- libXinerama (disable with make xinerama=0)
If built with exif=1:
- libexif-dev
- libexif12
Recommended Binaries
- convert (supplied by ImageMagick, can be used to load image formats not supported by Imlib2)
Installation
For end users:
$ make
$ sudo make install app=1
For package maintainers and users who do not want feh to install its icons into /usr/share:
$ make
$ sudo make install
Explanation: feh ships some icons and an X11 desktop entry, which allow it to be used from file managers, desktop menus and similar. However, installing icons to /usr/local/share/... does not seem to work reliably. Because of this, when using "make install app=1", feh will install its icons to /usr/share/..., even though they technically belong into /usr/local.
ZSH completion for feh is also available.
Make flags
feh's build process uses make flags to enable/disable optional features and fine-tune the build and installation process. They can be passed as make arguments or set as environment variables, like so:
make flag=bool
make install flag=bool
or
export flag=bool
make && make install
The following flags are respected by the makefile. A default value of 1 indicates that the corresponding feature is enabled by default.
| Flag | Default value | Description |
|---|---|---|
| app | 0 | install icons to /usr/share, regardless of DESTDIR and PREFIX, and call gtk-update-icon-cache afterwards |
| curl | 1 | use libcurl to view https:// and similar images |
| debug | 0 | debug build, enables --debug
|
| exif | 0 | Builtin EXIF tag display support |
| help | 0 | include help text (refers to the manpage otherwise) |
| inotify | 0 | enable inotify, needed for --auto-reload
|
| stat64 | 0 | Support CIFS shares from 64bit hosts on 32bit machines |
| verscmp | 1 | Whether your libc provides strvercmp(). If set to 0, feh will use an internal implementation. |
| xinerama | 1 | Support Xinerama/XRandR multiscreen setups |
For example, make xinerama=0 debug=1 will disable Xinerama support and
produce a debug build; libcurl and natural sorting support will remain enabled.
Additionally, the standard variables PREFIX and DESTDIR are supported.
PREFIX (default: /usr/local) controls where the application and its data files
will be installed. It must be set both during make and make install.
DESTDIR (default: empty) sets the installation root during "make install". It is mostly useful for package maintainers.
Note: Defaults are specified in config.mk. It is designed so that in most
cases, you can set environment variables instead of editing it. E.g.:
CFLAGS='-g -Os' make
export DESTDIR=/tmp/feh PREFIX=/usr
make && make install
Builtin EXIF support is maintained by Dennis Real, here.
Testing (non-X)
The non-X11 parts of feh can be automatically tested by running
$ make test
This requires perl >= 5.10 and the perl module Test::Command. Tests are
non-interactive and do not require a running X11, so they can safely be run on
a headless buildserver.
Contributing
Bugfixes are always welcome, just open a pull request :)
Before proposing a new feature, please consider the scope of feh: It is an image viewer and cataloguer, not an image editor or similar. Also, its option list is already pretty long. Please discuss your ideas in a feature request before opening a pull request in this case.
Please keep in mind that feh's options, key bindings and format specifiers are documented in two different places: The manual (man/feh.pre) and the help text (src/help.raw). Although the help is not compiled in by default, it should be kept up-to-date. On space-constrained embedded systems, it may be more useful than the (significantly larger) man page.