Make rustfmt an optional dependency

.travis.yml

@@ -7,10 +7,23 @@ os:
   - osx
 rust:
   - nightly
+env:
+  - RUSTFMT=true
+matrix:
+  include:
+    rust: nightly
+    env: RUSTFMT=false
+    os: linux
 install:
     # Required for Racer autoconfiguration
     rustup component add rust-src
-script:
+script: |
+  #!/bin/bash
   # compile #[cfg(not(test))] code
-  - cargo build --verbose
-  - cargo test --verbose
+  if [ "$RUSTFMT" == "false" ] ; then
+    cargo build --verbose --no-default-features
+    cargo test --verbose --no-default-features
+  else
+    cargo build --verbose
+    cargo test --verbose
+  fi

Cargo.toml

@@ -22,9 +22,13 @@ rls-data = { version = "0.13", features = ["serialize-serde"] }
 rls-rustc = "0.1"
 rls-span = { version = "0.4", features = ["serialize-serde"] }
 rls-vfs = { version = "0.4", features = ["racer-impls"] }
-rustfmt-nightly = "0.2.17"
+rustfmt-nightly = { version = "0.2.17", optional = true }
 serde = "1.0"
 serde_json = "1.0"
 serde_derive = "1.0"
 url = "1.1.0"
 rayon = "0.9"
+
+[features]
+default = ["rustfmt"]
+rustfmt = ["rustfmt-nightly"]

src/actions/mod.rs

@@ -13,7 +13,9 @@
 
 use analysis::AnalysisHost;
 use vfs::Vfs;
-use config::{Config, FmtConfig};
+#[cfg(feature = "rustfmt")]
+use config::FmtConfig;
+use config::Config;
 use serde_json;
 use url::Url;
 use span;
@@ -158,6 +160,7 @@ impl InitActionContext {
         }
     }
 
+    #[cfg(feature = "rustfmt")]
     fn fmt_config(&self) -> FmtConfig {
         FmtConfig::from(&self.current_project)
     }

src/actions/requests.rs

@@ -13,9 +13,12 @@
 use actions::{ActionContext, InitActionContext};
 use data;
 use url::Url;
+#[cfg(feature = "rustfmt")]
 use vfs::FileContents;
 use racer;
+#[cfg(feature = "rustfmt")]
 use rustfmt::{format_input, Input as FmtInput};
+#[cfg(feature = "rustfmt")]
 use rustfmt::file_lines::{FileLines, Range as RustfmtRange};
 use serde_json;
 use span;
@@ -778,13 +781,26 @@ impl RequestAction for Formatting {
         ))
     }
 
+    #[cfg(feature = "rustfmt")]
     fn handle(
         &mut self,
         ctx: InitActionContext,
         params: Self::Params,
     ) -> Result<Self::Response, ResponseError> {
         reformat(params.text_document, None, &params.options, ctx)
     }
+
+    #[cfg(not(feature = "rustfmt"))]
+    fn handle(
+        &mut self,
+        _: InitActionContext,
+        _: Self::Params,
+    ) -> Result<Self::Response, ResponseError> {
+        Err(ResponseError::Message(
+            ErrorCode::InternalError,
+            "rustfmt was not distributed with this rls release".into(),
+        ))
+    }
 }
 
 /// Pretty print the source within the given location range.
@@ -809,6 +825,7 @@ impl RequestAction for RangeFormatting {
         ))
     }
 
+    #[cfg(feature = "rustfmt")]
     fn handle(
         &mut self,
         ctx: InitActionContext,
@@ -821,8 +838,20 @@ impl RequestAction for RangeFormatting {
             ctx,
         )
     }
+    #[cfg(not(feature = "rustfmt"))]
+    fn handle(
+        &mut self,
+        _: InitActionContext,
+        _: Self::Params,
+    ) -> Result<Self::Response, ResponseError> {
+        Err(ResponseError::Message(
+            ErrorCode::InternalError,
+            "rustfmt was not distributed with this rls release".into(),
+        ))
+    }
 }
 
+#[cfg(feature = "rustfmt")]
 fn reformat(
     doc: TextDocumentIdentifier,
     selection: Option<Range>,

src/config.rs

@@ -23,7 +23,9 @@ use cargo::core::{Shell, Workspace};
 
 use serde::de::{Deserialize, Deserializer};
 
+#[cfg(feature = "rustfmt")]
 use rustfmt::config::Config as RustfmtConfig;
+#[cfg(feature = "rustfmt")]
 use rustfmt::config::WriteMode;
 
 const DEFAULT_WAIT_TO_BUILD: u64 = 500;
@@ -282,8 +284,10 @@ impl Config {
 /// rustfmt generates from the user's toml file, since when
 /// using rustfmt with rls certain configuration options are
 /// always used. See `FmtConfig::set_rls_options`
+#[cfg(feature = "rustfmt")]
 pub struct FmtConfig(RustfmtConfig);
 
+#[cfg(feature = "rustfmt")]
 impl FmtConfig {
     /// Look for `.rustmt.toml` or `rustfmt.toml` in `path`, falling back
     /// to the default config if neither exist
@@ -309,6 +313,7 @@ impl FmtConfig {
     }
 }
 
+#[cfg(feature = "rustfmt")]
 impl Default for FmtConfig {
     fn default() -> FmtConfig {
         let config = RustfmtConfig::default();

src/main.rs

@@ -36,6 +36,7 @@ extern crate rls_data as data;
 extern crate rls_rustc as rustc_shim;
 extern crate rls_span as span;
 extern crate rls_vfs as vfs;
+#[cfg(feature = "rustfmt")]
 extern crate rustfmt_nightly as rustfmt;
 extern crate serde;
 #[macro_use]