Merge pull request #3 from ATTron/feature/sc-55

feat: [sc-55] Astroz: create constants for the known forces

build.zig

@@ -14,22 +14,24 @@ pub fn build(b: *std.Build) void {
     // set a preferred release mode, allowing the user to decide how to optimize.
     const optimize = b.standardOptimizeOption(.{});
 
-    const lib = b.addStaticLibrary(.{
-        .name = "astroz",
-        // In this case the main source file is merely a path, however, in more
-        // complicated build scripts, this could be a generated file.
+    _ = b.addModule("astroz", .{
+        .root_source_file = b.path("src/lib.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    _ = b.addModule("astroz.ccsds", .{
         .root_source_file = b.path("src/ccsds.zig"),
         .target = target,
         .optimize = optimize,
     });
 
-    // This declares intent for the library to be installed into the standard
-    // location when the user invokes the "install" step (the default step when
-    // running `zig build`).
-    b.installArtifact(lib);
+    _ = b.addModule("astroz.constants", .{
+        .root_source_file = b.path("src/constants.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
 
-    // Creates a step for unit testing. This only builds the test executable
-    // but does not run it.
     const lib_unit_tests = b.addTest(.{
         .root_source_file = b.path("src/ccsds.zig"),
         .target = target,
@@ -38,9 +40,6 @@ pub fn build(b: *std.Build) void {
 
     const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
 
-    // Similar to creating the run step earlier, this exposes a `test` step to
-    // the `zig build --help` menu, providing a way for the user to request
-    // running the unit tests.
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_lib_unit_tests.step);
 }

src/constants.zig

@@ -0,0 +1,12 @@
+// gravity
+pub const G = 6.6743e-11;
+// sol
+pub const c = 299792458;
+// earth mass
+pub const moe = 5.97216787e+24;
+// solar mass
+pub const mos = 1.49597871e+11;
+// planck constant
+pub const h = 6.62607015e-34;
+// astronmical unit
+pub const au = 1.49597871e+11;

src/lib.zig

@@ -0,0 +1,2 @@
+const ccsds = @import("ccsds.zig");
+const constants = @import("constants.zig");