lib: add BUCK files

The `grammar` macro from `pest_derive` doesn't actually interpret the given file
as relative in our case, so we have to give it the fully qualified relative path
which exists in the `buck-out/` dir.

BUCK

@@ -3,6 +3,7 @@
     alias(name = name, actual = actual)
         for (name, actual) in [
             # (top-level name, fully-qualified target name)
+            ("jj-lib",      "//lib:lib"),
             ("proc-macros", "//lib/proc-macros:proc-macros"),
         ]
 ]

lib/BUCK

@@ -0,0 +1,86 @@
+
+load("//buck/shims/jj.bzl", "jj")
+
+alias(
+    # NOTE: default target for this package
+    name = 'lib',
+    actual = ':jj-lib',
+    visibility = [ 'PUBLIC' ],
+)
+
+filegroup(
+    name = 'protos.pb',
+    srcs = glob(['src/protos/*.proto']),
+    visibility = [ '//lib/...' ],
+)
+
+jj.rust_library(
+    name = "jj-lib",
+    srcs = glob([
+        "src/**/*.pest",
+        "src/**/*.rs",
+    ], exclude = [
+        "src/protos/*.rs"
+    ]),
+    mapped_srcs = {
+        "//lib/gen-protos:protos.rs": "src/protos",
+    },
+
+    visibility = [ "PUBLIC" ],
+    features = [
+        "watchman",
+    ],
+    deps = [
+        # first-party dependencies
+        "//lib/proc-macros:jj-lib-proc-macros",
+    ] + [
+        # third-party dependencies
+        "third-party//rust:async-trait",
+        "third-party//rust:backoff",
+        "third-party//rust:blake2",
+        "third-party//rust:bytes",
+        "third-party//rust:chrono",
+        "third-party//rust:config",
+        "third-party//rust:digest",
+        "third-party//rust:either",
+        "third-party//rust:futures",
+        "third-party//rust:git2",
+        "third-party//rust:gix",
+        "third-party//rust:glob",
+        "third-party//rust:hex",
+        "third-party//rust:ignore",
+        "third-party//rust:itertools",
+        "third-party//rust:maplit",
+        "third-party//rust:once_cell",
+        "third-party//rust:pest",
+        "third-party//rust:pest_derive",
+        "third-party//rust:pollster",
+        "third-party//rust:prost",
+        "third-party//rust:rand",
+        "third-party//rust:rand_chacha",
+        "third-party//rust:rayon",
+        "third-party//rust:ref-cast",
+        "third-party//rust:regex",
+        "third-party//rust:serde",
+        "third-party//rust:serde_json",
+        "third-party//rust:smallvec",
+        "third-party//rust:strsim",
+        "third-party//rust:tempfile",
+        "third-party//rust:thiserror",
+        "third-party//rust:tokio",
+        "third-party//rust:tracing",
+        "third-party//rust:watchman_client",
+        "third-party//rust:whoami",
+        "third-party//rust:zstd",
+
+        # platform-specific dependencies
+    ] + select({
+        "config//os:windows": [
+            "third-party//rust:winreg",
+        ],
+        "config//os:linux": [
+            "third-party//rust:rustix",
+        ],
+        "DEFAULT": [],
+    })
+)

lib/src/fileset_parser.rs

@@ -26,6 +26,12 @@ use thiserror::Error;
 
 use crate::dsl_util::StringLiteralParser;
 
+#[cfg(buck_build)]
+#[derive(Parser)]
+#[grammar = "lib/src/fileset.pest"]
+struct FilesetParser;
+
+#[cfg(not(buck_build))]
 #[derive(Parser)]
 #[grammar = "fileset.pest"]
 struct FilesetParser;

lib/src/revset_parser.rs

@@ -31,6 +31,12 @@ use crate::op_store::WorkspaceId;
 // TODO: remove reverse dependency on revset module
 use crate::revset::{ParseState, RevsetExpression, RevsetModifier};
 
+#[cfg(buck_build)]
+#[derive(Parser)]
+#[grammar = "lib/src/revset.pest"]
+struct RevsetParser;
+
+#[cfg(not(buck_build))]
 #[derive(Parser)]
 #[grammar = "revset.pest"]
 struct RevsetParser;