specify escript path from cli

Summary: the same as previous diff but for `escript`

Reviewed By: alanz

Differential Revision: D56197690

fbshipit-source-id: d40eaf1b3be15331373ed5db9000ff4b62ecaf89

crates/elp/src/bin/args.rs

@@ -328,6 +328,8 @@ pub struct Args {
     pub log_file: Option<PathBuf>,
     #[bpaf(argument("ERL"))]
     pub erl: Option<PathBuf>,
+    #[bpaf(argument("ESCRIPT"))]
+    pub escript: Option<PathBuf>,
     pub no_log_buffering: bool,
     #[bpaf(external(command))]
     pub command: Command,

crates/elp/src/bin/main.rs

@@ -19,6 +19,7 @@ use bpaf::batteries;
 use elp::cli;
 use elp::cli::Cli;
 use elp::ServerSetup;
+use elp_ide::erlang_service::ESCRIPT;
 use elp_log::timeit;
 use elp_log::FileLogger;
 use elp_log::Logger;
@@ -85,6 +86,12 @@ fn setup_static(args: &Args) {
         let mut erl = ERL.write().unwrap();
         *erl = path.to_string_lossy().to_string();
     }
+
+    if let Some(escript) = &args.escript {
+        let path = fs::canonicalize(escript).expect("escript path should be valid");
+        let mut escript = ESCRIPT.write().unwrap();
+        *escript = path.to_string_lossy().to_string();
+    }
 }
 
 fn try_main(cli: &mut dyn Cli, args: Args) -> Result<()> {

crates/elp/src/resources/test/help.stdout

@@ -1,8 +1,9 @@
-Usage: [--log-file LOG_FILE] [--erl ERL] [--no-log-buffering] [COMMAND ...]
+Usage: [--log-file LOG_FILE] [--erl ERL] [--escript ESCRIPT] [--no-log-buffering] [COMMAND ...]
 
 Available options:
         --log-file <LOG_FILE>
         --erl <ERL>
+        --escript <ESCRIPT>
         --no-log-buffering
     -h, --help                 Prints help information
 

crates/erlang_service/src/lib.rs

@@ -19,6 +19,7 @@ use std::process::ChildStdout;
 use std::process::Command;
 use std::process::Stdio;
 use std::sync::Arc;
+use std::sync::RwLock;
 use std::time::Duration;
 
 use anyhow::anyhow;
@@ -46,6 +47,10 @@ use text_size::TextRange;
 
 pub mod common_test;
 
+lazy_static! {
+    pub static ref ESCRIPT: RwLock<String> = RwLock::new("escript".to_string());
+}
+
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
 pub enum DiagnosticLocation {
     Normal(TextRange),
@@ -324,7 +329,9 @@ impl Connection {
         let mut escript = Builder::new().prefix("erlang_service").tempfile()?;
         escript.write_all(escript_src)?;
 
-        let mut cmd = Command::new("escript");
+        let escript_bin = ESCRIPT.read().unwrap();
+
+        let mut cmd = Command::new(&*escript_bin);
         cmd.arg(escript.path());
 
         cmd.stdin(Stdio::piped())