Allow actions to be defined to handle URLs #199
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Implements the logic to read rules from ~/.dillo/rulesrc which define custom actions to handle a URL. Here is an example:
action "Open with MPV" shell "mpv $url"
action "Open with MPV (only audio)" shell "mpv --no-video $url"
action "Open with Firefox" shell "firefox $url"
The standard input and output is still redirected to the same file descriptor as Dillo.
The commands are spawned in a forked process using the system() call, which uses the shell to expand any variable. In particular, the $url variable is set to the current URL being opened.