Merge pull request 'Better LILV/LV2 integration' (#15) from better-lilv into master

Reviewed-on: #15

.gitignore

@@ -1,3 +1,4 @@
 zig-cache/
 *.mp3
 *.wav
+build_runner.zig

build.zig

@@ -1,5 +1,6 @@
-const builds = @import("std").build;
+const std = @import("std");
-const Builder = @import("std").build.Builder;
+const builds = std.build;
+const Builder = std.build.Builder;
 
 fn setupLinks(step: *builds.LibExeObjStep) void {
     step.linkSystemLibrary("c");
@@ -11,8 +12,33 @@ fn setupLinks(step: *builds.LibExeObjStep) void {
     step.linkSystemLibrary("GraphicsMagickWand");
     step.linkSystemLibrary("GraphicsMagick");
 
-    step.addIncludeDir("/usr/include/lilv-0");
     step.addIncludeDir("/usr/include/GraphicsMagick");
+    step.addIncludeDir("/usr/include");
+
+    const possible_lilv_include_dirs = [_][]const u8{
+        "/usr/include/lilv-0/lilv",
+        "/usr/include/lilv-0",
+    };
+
+    var found_any_lilv = false;
+
+    for (possible_lilv_include_dirs) |possible_lilv_dir| {
+        var possible_dir = std.fs.cwd().openDir(possible_lilv_dir, .{}) catch |err| {
+            std.debug.warn("possible lilv {} fail: {}\n", .{ possible_lilv_dir, err });
+            continue;
+        };
+
+        possible_dir.close();
+        found_any_lilv = true;
+
+        std.debug.warn("found lilv at '{}'\n", .{possible_lilv_dir});
+        step.addIncludeDir(possible_lilv_dir);
+    }
+
+    if (!found_any_lilv) {
+        std.debug.warn("No LILV library was found :(\n", .{});
+        @panic("no lilv found");
+    }
 }
 
 pub fn build(b: *Builder) void {

src/lv2_helpers.zig

@@ -4,7 +4,7 @@ const plugin = @import("plugin.zig");
 pub const c = @cImport({
     @cInclude("sndfile.h");
     @cInclude("lilv/lilv.h");
-    @cInclude("lv2/core/lv2.h");
+    @cInclude("lv2.h");
 });
 
 pub fn Lv2Core(comptime ns: []const u8) []const u8 {