Add an example to the README

1 files changed, 47 insertions, 0 deletions

diff --git a/README.md b/README.md
index d65ff49..e256438 100644
--- a/README.md
+++ b/README.md
@@ -15,4 +15,51 @@ simply aims to be a set of potentially useful functions and macros to
 make writing a build script in C a bit easier.  If there is functionality
 you are missing, then add it.  You’re a programmer aren’t you?
 
+All functions and macros are documented in cbs.h.
+
 CBS is very much inspired by Tsoding’s ‘Nob’.
+
+
+## Example
+
+Assuming you have a source file `my-file.c` — you can compile this build
+script (called `build.c` for example) with `cc build.c` to bootstrap —
+and then run `./a.out` to build the `my-file` binary linked against the
+liblux library.
+
+If you make any modifications to the build script *or* to the cbs.h
+header, there is no need to manually recompile — the script will rebuild
+itself.
+
+```c
+#include "cbs.h"
+
+#define needs_rebuild(dst, src) (!fexists(dst) || fmdolder(dst, src))
+
+#define CC     "cc"
+#define CFLAGS "-Wall", "-Wextra", "-Werror", "-O3"
+#define TARGET "my-file"
+
+int
+main(int argc, char **argv)
+{
+	int ec;
+	struct cmd cmd = {0};
+
+	cbsinit(argc, argv);
+	rebuild();
+
+	if (!needs_rebuild(TARGET, TARGET ".c"))
+		return EXIT_SUCCESS;
+
+	cmdadd(&cmd, "cc");
+	if (!pcquery(&cmd, "liblux", PKGC_LIBS | PKGC_CFLAGS))
+		cmdadd(&cmd, "-llux");
+	cmdadd(&cmd, CFLAGS, "-o", TARGET, TARGET ".c");
+	cmdput(cmd);
+	if ((ec = cmdexec(cmd)) != EXIT_SUCCESS)
+		diex("%s failed with exit-code %d", *cmd.argv, ec);
+
+	return EXIT_SUCCESS;
+}
+```