Redact environment variables from language server spawn errors (#44783)

Redact environment variables from zed logs when lsp fails to spawn.

Release Notes:

- N/A

crates/project/src/lsp_store.rs

@@ -128,6 +128,7 @@ use util::{
     ConnectionResult, ResultExt as _, debug_panic, defer, maybe, merge_json_value_into,
     paths::{PathStyle, SanitizedPath},
     post_inc,
+    redact::redact_command,
     rel_path::RelPath,
 };
 
@@ -577,9 +578,12 @@ impl LocalLspStore {
                                 },
                             },
                         );
-                        log::error!("Failed to start language server {server_name:?}: {err:?}");
+                        log::error!(
+                            "Failed to start language server {server_name:?}: {}",
+                            redact_command(&format!("{err:?}"))
+                        );
                         if !log.is_empty() {
-                            log::error!("server stderr: {log}");
+                            log::error!("server stderr: {}", redact_command(&log));
                         }
                         None
                     }

crates/util/src/redact.rs

@@ -1,3 +1,9 @@
+use std::sync::LazyLock;
+
+static REDACT_REGEX: LazyLock<regex::Regex> = LazyLock::new(|| {
+    regex::Regex::new(r#"([A-Z_][A-Z0-9_]*)=("(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*'|\S+)"#).unwrap()
+});
+
 /// Whether a given environment variable name should have its value redacted
 pub fn should_redact(env_var_name: &str) -> bool {
     const REDACTED_SUFFIXES: &[&str] = &[
@@ -13,3 +19,31 @@ pub fn should_redact(env_var_name: &str) -> bool {
         .iter()
         .any(|suffix| env_var_name.ends_with(suffix))
 }
+
+/// Redact a string which could include a command with environment variables
+pub fn redact_command(command: &str) -> String {
+    REDACT_REGEX
+        .replace_all(command, |caps: &regex::Captures| {
+            let var_name = &caps[1];
+            let value = &caps[2];
+            if should_redact(var_name) {
+                format!(r#"{}="[REDACTED]""#, var_name)
+            } else {
+                format!("{}={}", var_name, value)
+            }
+        })
+        .to_string()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_redact_string_with_multiple_env_vars() {
+        let input = r#"failed to spawn command cd "/code/something" && ANTHROPIC_API_KEY="sk-ant-api03-WOOOO" COMMAND_MODE="unix2003" GEMINI_API_KEY="AIGEMINIFACE" HOME="/Users/foo""#;
+        let result = redact_command(input);
+        let expected = r#"failed to spawn command cd "/code/something" && ANTHROPIC_API_KEY="[REDACTED]" COMMAND_MODE="unix2003" GEMINI_API_KEY="[REDACTED]" HOME="/Users/foo""#;
+        assert_eq!(result, expected);
+    }
+}