added bazel workspace lsp support

bazel/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "bazel"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

bazel/src/bazel_info.rs

@@ -0,0 +1,84 @@
+use std::fmt::Debug;
+use std::path::PathBuf;
+use std::process::Command;
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct BazelInfo {
+    pub workspace_root: PathBuf,
+    pub output_base: PathBuf,
+    pub execroot: PathBuf,
+}
+
+fn parse_bazel_info(info: &str) -> Option<BazelInfo> {
+    let mut workspace_root: Option<PathBuf> = None;
+    let mut output_base: Option<PathBuf> = None;
+    let mut execroot: Option<PathBuf> = None;
+    info.split('\n').for_each(|l| {
+        let split: Vec<&str> = l.splitn(2, ':').collect();
+        if split.len() != 2 {
+            return;
+        }
+        let first = split.get(0);
+        let next = split.get(1);
+        match (first, next) {
+            (Some(key), Some(value)) => match key {
+                &"execution_root" => execroot = Some(value.trim().into()),
+                &"output_base" => output_base = Some(value.trim().into()),
+                &"workspace" => workspace_root = Some(value.trim().into()),
+                _ => {}
+            },
+            _ => {}
+        }
+    });
+    match (execroot, output_base, workspace_root) {
+        (Some(execroot), Some(output_base), Some(workspace_root)) => Some(BazelInfo {
+            workspace_root,
+            execroot,
+            output_base,
+        }),
+        _ => {
+            eprintln!(
+                "Couldn't find workspace_root, execroot or output_base in output:\n`{}`",
+                info
+            );
+            None
+        }
+    }
+}
+
+pub fn get_bazel_info(workspace_dir: Option<&str>) -> Option<BazelInfo> {
+    let mut raw_command = Command::new("bazel");
+    let mut command = raw_command.arg("info");
+    command = match workspace_dir {
+        Some(d) => command.current_dir(d),
+        None => command,
+    };
+
+    let output = command.output().ok()?;
+
+    if !output.status.success() {
+        return None;
+    }
+
+    let s = std::str::from_utf8(output.stdout.as_slice()).ok()?;
+
+    parse_bazel_info(s)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::parse_bazel_info;
+    use super::BazelInfo;
+
+    #[test]
+    fn parses_info() {
+        assert_eq!(
+            parse_bazel_info(include_str!("info.txt")),
+            Some(BazelInfo {
+                workspace_root: "/home/user/dev/bazel/bazel".into(),
+                execroot: "/home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/execroot/io_bazel".into(),
+                output_base: "/home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf".into()
+            })
+        )
+    }
+}

bazel/src/info.txt

@@ -0,0 +1,23 @@
+bazel-bin: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/execroot/io_bazel/bazel-out/k8-fastbuild/bin
+bazel-genfiles: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/execroot/io_bazel/bazel-out/k8-fastbuild/bin
+bazel-testlogs: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/execroot/io_bazel/bazel-out/k8-fastbuild/testlogs
+character-encoding: file.encoding = ISO-8859-1, defaultCharset = ISO-8859-1
+command_log: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/command.log
+committed-heap-size: 418MB
+execution_root: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/execroot/io_bazel
+gc-count: 11
+gc-time: 42ms
+install_base: /home/user/.cache/bazel/_bazel_user/install/41b71f1bb3ce13f20cfeeb31a9357113
+java-home: /home/user/.cache/bazel/_bazel_user/install/41b71f1bb3ce13f20cfeeb31a9357113/embedded_tools/jdk
+java-runtime: OpenJDK Runtime Environment (build 11.0.6+10-LTS) by Azul Systems, Inc.
+java-vm: OpenJDK 64-Bit Server VM (build 11.0.6+10-LTS, mixed mode) by Azul Systems, Inc.
+max-heap-size: 4175MB
+output_base: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf
+output_path: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/execroot/io_bazel/bazel-out
+package_path: %workspace%
+release: release 5.2.0
+repository_cache: /home/user/.cache/bazel/_bazel_user/cache/repos/v1
+server_log: /home/user/.cache/bazel/_bazel_user/726bdc44ca84ffc53f631c27e313c4cf/java.log.home.user.log.java.20220821-211440.206313
+server_pid: 206313
+used-heap-size: 266MB
+workspace: /home/user/dev/bazel/bazel