add syntax highlighting (gitui-org#727)

Author: Stephan Dilly

Cargo.lock

@@ -22,6 +22,7 @@ keywords = [
 scopetime = { path = "./scopetime", version = "0.1" }
 asyncgit = { path = "./asyncgit", version = "0.15" }
 filetree = { path = "./filetree" }
+async_utils = { path = "./async_utils" }
 crossterm = { version = "0.19", features = [ "serde" ] }
 clap = { version = "2.33", default-features = false }
 tui = { version = "0.15", default-features = false, features = ['crossterm', 'serde'] }
@@ -44,6 +45,8 @@ textwrap = "0.13"
 unicode-truncate = "0.2"
 easy-cast = "0.4"
 bugreport = "0.4"
+lazy_static = "1.4"
+syntect = { version = "4.5", default-features = false, features = ["metadata", "default-fancy"]}
 
 [target.'cfg(all(target_family="unix",not(target_os="macos")))'.dependencies]
 which = "4.1"
@@ -63,6 +66,8 @@ timing=["scopetime/enabled"]
 members=[
     "asyncgit",
     "scopetime",
+    "async_utils",
+    "filetree",
 ]
 
 [profile.release]

Cargo.toml

@@ -45,12 +45,12 @@ fmt:
 
 clippy:
 	touch src/main.rs
-	cargo clean -p gitui -p asyncgit -p scopetime -p filetree
+	cargo clean -p gitui -p asyncgit -p scopetime -p filetree -p async_utils
 	cargo clippy --workspace --all-features
 
 clippy-nightly:
 	touch src/main.rs
-	cargo clean -p gitui -p asyncgit -p scopetime -p filetree
+	cargo clean -p gitui -p asyncgit -p scopetime -p filetree -p async_utils
 	cargo +nightly clippy --all-features
 
 check: fmt clippy test