notify: break out desktop notifications from osc.c

notify.c

@@ -0,0 +1,103 @@
+#include "notify.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define LOG_MODULE "notify"
+#define LOG_ENABLE_DBG 0
+#include "log.h"
+#include "config.h"
+#include "spawn.h"
+#include "xmalloc.h"
+
+void
+notify_notify(const struct terminal *term, const char *title, const char *body)
+{
+    LOG_DBG("notify: title=\"%s\", msg=\"%s\"", title, msg);
+
+    if (title == NULL || body == NULL)
+        return;
+
+    if (term->conf->notify.argv == NULL)
+        return;
+
+    size_t argv_size = 0;
+    for (; term->conf->notify.argv[argv_size] != NULL; argv_size++)
+        ;
+
+#define append(s, n)                                        \
+    do {                                                    \
+        expanded = xrealloc(expanded, len + (n) + 1);       \
+        memcpy(&expanded[len], s, n);                       \
+        len += n;                                           \
+        expanded[len] = '\0';                               \
+    } while (0)
+
+    char **argv = malloc((argv_size + 1) * sizeof(argv[0]));
+
+    /* Expand ${title} and ${body} */
+    for (size_t i = 0; i < argv_size; i++) {
+        size_t len = 0;
+        char *expanded = NULL;
+
+        char *start = NULL;
+        char *last_end = term->conf->notify.argv[i];
+
+        while ((start = strstr(last_end, "${")) != NULL) {
+            /* Append everything from the last template's end to this
+             * one's beginning */
+            append(last_end, start - last_end);
+
+            /* Find end of template */
+            start += 2;
+            char *end = strstr(start, "}");
+
+            if (end == NULL) {
+                /* Ensure final append() copies the unclosed '${' */
+                last_end = start - 2;
+                LOG_WARN("notify: unclosed template: %s", last_end);
+                break;
+            }
+
+            /* Expand template */
+            if (strncmp(start, "title", end - start) == 0)
+                append(title, strlen(title));
+            else if (strncmp(start, "body", end - start) == 0)
+                append(body, strlen(body));
+            else {
+                /* Unrecognized template - append it as-is */
+                start -= 2;
+                append(start, end + 1 - start);
+                LOG_WARN("notify: unrecognized template: %.*s",
+                         (int)(end + 1 - start), start);
+            }
+
+            last_end = end + 1;;
+        }
+
+        append(last_end, term->conf->notify.argv[i] + strlen(term->conf->notify.argv[i]) - last_end);
+        argv[i] = expanded;
+    }
+    argv[argv_size] = NULL;
+
+#undef append
+
+    LOG_DBG("notify command:");
+    for (size_t i = 0; i < argv_size; i++)
+        LOG_DBG("  argv[%zu] = \"%s\"", i, argv[i]);
+
+    /* Redirect stdin to /dev/null, but ignore failure to open */
+    int devnull = open("/dev/null", O_RDONLY);
+    spawn(term->reaper, NULL, argv, devnull, -1, -1);
+
+    if (devnull >= 0)
+        close(devnull);
+
+    for (size_t i = 0; i < argv_size; i++)
+        free(argv[i]);
+    free(argv);
+}