Split out pretty-print.c and move pager.c and main-func.h to shared/

This is high-level functionality, and fits better in shared/ (which is for
our executables), than in basic/ (which is also for libraries).

1 files changed, 27 insertions, 0 deletions

diff --git a/src/shared/main-func.h b/src/shared/main-func.h
new file mode 100644
index 0000000000..24bf6c99bf
--- /dev/null
+++ b/src/shared/main-func.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include <stdlib.h>
+
+#include "pager.h"
+#include "static-destruct.h"
+
+#define _DEFINE_MAIN_FUNCTION(impl, ret)                                \
+        int main(int argc, char *argv[]) {                              \
+                int r;                                                  \
+                r = impl(argc, argv);                                   \
+                static_destruct();                                      \
+                pager_close();                                          \
+                return ret;                                             \
+        }
+
+/* Negative return values from impl are mapped to EXIT_FAILURE, and
+ * everything else means success! */
+#define DEFINE_MAIN_FUNCTION(impl)                                      \
+        _DEFINE_MAIN_FUNCTION(impl, r < 0 ? EXIT_FAILURE : EXIT_SUCCESS)
+
+/* Zero is mapped to EXIT_SUCCESS, negative values are mapped to EXIT_FAILURE,
+ * and postive values are propagated.
+ * Note: "true" means failure! */
+#define DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(impl)                \
+        _DEFINE_MAIN_FUNCTION(impl, r < 0 ? EXIT_FAILURE : r)