Replace git current_branch to shadow-rs branch (#2935)

* update to shadow-rs 0.4. use easy

* update shadow-rs to 0.5

* fix version not used

* update

* update Cargo.lock

* update Cargo.lock

* fix wasm build error when use dependence git2
fix error link:https://dev.azure.com/nushell/nushell/_build/results?buildId=4858&view=logs&j=1a745d4c-b027-5f34-06d8-d6f256bfe9f9&t=a0a335cb-fa1f-5bbf-be01-1a90d6899e54

* remove code not used; fix warning by RUSTFLAGS="-D warnings" build error

* upgrade shadow-rs 0.5.2

* upgrade shadow-rs 0.5.7

make nushell reduce dependence crates smaller and  build fast.

* upgrade shadow-rs 0.5.8

fix when use api 'strip_prefix()' method in less than rust1.45.0 build failed

* use shadow-rs branch replace with current_branch method;
remove and reduce git dependencies.

* upgrade shadow-rs 0.5.12-pre,test build error with wasm

* upgrade Cargo.lock

* upgarde shadow-rs depencdence

* fix build error in wasm

* add clippy warning

crates/nu-cli/src/cli.rs

@@ -163,17 +163,9 @@ pub async fn cli(mut context: EvaluationContext) -> Result<(), Box<dyn Error>> {
                 let (prompt_block, err) = nu_parser::parse(&prompt_line, 0, &context.scope);
 
                 if err.is_some() {
-                    use crate::git::current_branch;
                     context.scope.exit_scope();
 
-                    format!(
-                        "\x1b[32m{}{}\x1b[m> ",
-                        cwd,
-                        match current_branch() {
-                            Some(s) => format!("({})", s),
-                            None => "".to_string(),
-                        }
-                    )
+                    format!("\x1b[32m{}{}\x1b[m> ", cwd, current_branch())
                 } else {
                     // let env = context.get_env();
 
@@ -209,15 +201,7 @@ pub async fn cli(mut context: EvaluationContext) -> Result<(), Box<dyn Error>> {
                     }
                 }
             } else {
-                use crate::git::current_branch;
-                format!(
-                    "\x1b[32m{}{}\x1b[m> ",
-                    cwd,
-                    match current_branch() {
-                        Some(s) => format!("({})", s),
-                        None => "".to_string(),
-                    }
-                )
+                format!("\x1b[32m{}{}\x1b[m> ", cwd, current_branch())
             }
         };
 
@@ -371,7 +355,7 @@ async fn run_startup_commands(
             _ => {
                 return Err(ShellError::untagged_runtime_error(
                     "expected a table of pipeline strings as startup commands",
-                ))
+                ));
             }
         }
     }
@@ -405,6 +389,22 @@ pub async fn parse_and_eval(line: &str, ctx: &EvaluationContext) -> Result<Strin
     result?.collect_string(Tag::unknown()).await.map(|x| x.item)
 }
 
+#[allow(dead_code)]
+fn current_branch() -> String {
+    #[cfg(feature = "shadow-rs")]
+    {
+        Some(shadow_rs::branch())
+            .map(|x| x.trim().to_string())
+            .filter(|x| !x.is_empty())
+            .map(|x| format!("({})", x))
+            .unwrap_or_default()
+    }
+    #[cfg(not(feature = "shadow-rs"))]
+    {
+        "".to_string()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use nu_engine::basic_evaluation_context;

crates/nu-cli/src/git.rs

@@ -1,26 +0,0 @@
-pub fn current_branch() -> Option<String> {
-    #[cfg(feature = "git2")]
-    {
-        use git2::{Repository, RepositoryOpenFlags};
-        use std::ffi::OsString;
-
-        let v: Vec<OsString> = vec![];
-        match Repository::open_ext(".", RepositoryOpenFlags::empty(), v) {
-            Ok(repo) => {
-                let r = repo.head();
-                match r {
-                    Ok(r) => match r.shorthand() {
-                        Some(s) => Some(s.to_string()),
-                        None => None,
-                    },
-                    _ => None,
-                }
-            }
-            _ => None,
-        }
-    }
-    #[cfg(not(feature = "git2"))]
-    {
-        None
-    }
-}

crates/nu-cli/src/lib.rs

@@ -19,8 +19,6 @@ mod completion;
 mod env;
 mod format;
 #[cfg(feature = "rustyline-support")]
-mod git;
-#[cfg(feature = "rustyline-support")]
 mod keybinding;
 mod line_editor;
 mod shell;