Rewrite it in Rust

crunchy-cli-core/src/utils/os.rs

@@ -0,0 +1,52 @@
+use log::debug;
+use std::io::ErrorKind;
+use std::path::PathBuf;
+use std::process::Command;
+use std::{env, io};
+use tempfile::{Builder, NamedTempFile};
+
+pub fn has_ffmpeg() -> bool {
+    if let Err(e) = Command::new("ffmpeg").spawn() {
+        if ErrorKind::NotFound != e.kind() {
+            debug!(
+                "unknown error occurred while checking if ffmpeg exists: {}",
+                e.kind()
+            )
+        }
+        false
+    } else {
+        true
+    }
+}
+
+/// Any tempfiles should be created with this function. The prefix and directory of every file
+/// created with this method stays the same which is helpful to query all existing tempfiles and
+/// e.g. remove them in a case of ctrl-c. Having one function also good to prevent mistakes like
+/// setting the wrong prefix if done manually.
+pub fn tempfile<S: AsRef<str>>(suffix: S) -> io::Result<NamedTempFile> {
+    let tempfile = Builder::default()
+        .prefix(".crunchy-cli_")
+        .suffix(suffix.as_ref())
+        .tempfile_in(&env::temp_dir())?;
+    debug!(
+        "Created temporary file: {}",
+        tempfile.path().to_string_lossy()
+    );
+    Ok(tempfile)
+}
+
+/// Check if the given path exists and rename it until the new (renamed) file does not exist.
+pub fn free_file(mut path: PathBuf) -> (PathBuf, bool) {
+    let mut i = 0;
+    while path.exists() {
+        i += 1;
+
+        let ext = path.extension().unwrap().to_str().unwrap();
+        let mut filename = path.file_name().unwrap().to_str().unwrap();
+
+        filename = &filename[0..filename.len() - ext.len() - 1];
+
+        path.set_file_name(format!("{} ({}).{}", filename, i, ext))
+    }
+    (path, i != 0)
+}