1 files changed, 90 insertions, 0 deletions
diff --git a/src/ac-power/ac-power.c b/src/ac-power/ac-power.c
new file mode 100644
index 0000000..12379df
--- /dev/null
+++ b/src/ac-power/ac-power.c
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <getopt.h>
+
+#include "main-func.h"
+#include "udev-util.h"
+
+static bool arg_verbose = false;
+
+static void help(void) {
+        printf("%s\n\n"
+               "Report whether we are connected to an external power source.\n\n"
+               "  -h --help             Show this help\n"
+               "     --version          Show package version\n"
+               "  -v --verbose          Show state as text\n",
+               program_invocation_short_name);
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_VERSION = 0x100,
+        };
+
+        static const struct option options[] = {
+                { "help",    no_argument, NULL, 'h'         },
+                { "version", no_argument, NULL, ARG_VERSION },
+                { "verbose", no_argument, NULL, 'v'         },
+                {}
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hv", options, NULL)) >= 0)
+
+                switch (c) {
+
+                case 'h':
+                        help();
+                        return 0;
+
+                case ARG_VERSION:
+                        return version();
+
+                case 'v':
+                        arg_verbose = true;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        assert_not_reached();
+                }
+
+        if (optind < argc)
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "%s takes no arguments.",
+                                       program_invocation_short_name);
+
+        return 1;
+}
+
+static int run(int argc, char *argv[]) {
+        int r;
+
+        /* This is mostly intended to be used for scripts which want
+         * to detect whether AC power is plugged in or not. */
+
+        log_parse_environment();
+        log_open();
+
+        r = parse_argv(argc, argv);
+        if (r <= 0)
+                return r;
+
+        r = on_ac_power();
+        if (r < 0)
+                return log_error_errno(r, "Failed to read AC status: %m");
+
+        if (arg_verbose)
+                puts(yes_no(r));
+
+        return r == 0;
+}
+
+DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);