Decouple core Yaak logic from Tauri (#354)

crates/yaak-git/src/credential.rs

@@ -0,0 +1,47 @@
+use crate::binary::new_binary_command;
+use crate::error::Error::GenericError;
+use crate::error::Result;
+use std::io::Write;
+use std::path::Path;
+use std::process::Stdio;
+use url::Url;
+
+pub async fn git_add_credential(
+    dir: &Path,
+    remote_url: &str,
+    username: &str,
+    password: &str,
+) -> Result<()> {
+    let url = Url::parse(remote_url)
+        .map_err(|e| GenericError(format!("Failed to parse remote url {remote_url}: {e:?}")))?;
+    let protocol = url.scheme();
+    let host = url.host_str().unwrap();
+    let path = Some(url.path());
+
+    let mut child = new_binary_command(dir)?
+        .args(["credential", "approve"])
+        .stdin(Stdio::piped())
+        .stdout(Stdio::null())
+        .spawn()?;
+
+    {
+        let stdin = child.stdin.as_mut().unwrap();
+        writeln!(stdin, "protocol={}", protocol)?;
+        writeln!(stdin, "host={}", host)?;
+        if let Some(path) = path {
+            if !path.is_empty() {
+                writeln!(stdin, "path={}", path.trim_start_matches('/'))?;
+            }
+        }
+        writeln!(stdin, "username={}", username)?;
+        writeln!(stdin, "password={}", password)?;
+        writeln!(stdin)?; // blank line terminator
+    }
+
+    let status = child.wait()?;
+    if !status.success() {
+        return Err(GenericError("Failed to approve git credential".to_string()));
+    }
+
+    Ok(())
+}