ENH: Add AC power detection for *BSD systems

src/events.c

@@ -1,8 +1,9 @@
#include "events.h"

#include <glib.h>

#include <libwnck/libwnck.h>

#include <sys/param.h>
#include <time.h>

#include "entry.h"
@@ -234,6 +235,20 @@ is_on_ac_power ()
            return TRUE;
    }
    return FALSE;

#elif defined(__unix__) && defined(BSD) && !defined(__APPLE__)
    // On *BSD, run `apm -a` which returns '1' when AC is online
    g_autoptr (GError) err = NULL;
    g_autofree char *standard_output = NULL;
    char *argv[] = {"apm", "-a", NULL};

    g_spawn_sync (NULL, argv, NULL, G_SPAWN_SEARCH_PATH | G_SPAWN_STDERR_TO_DEV_NULL,
                  NULL, NULL, &standard_output, NULL, NULL, &err);
    if (err)
        g_warning ("Unexpected `apm -a` execution error: %s", err->message);

    return standard_output && 0 == g_strcmp0 (g_strstrip (standard_output), "1");

#else
    #warning "No battery / AC status support for your platform."
    #warning "Defaulting to as if 'always on battery' behavior. Patches welcome!"