Add rust example

examples/merge-file.rs

@@ -0,0 +1,58 @@
+use std::{env, fs, process};
+
+use reconcile_merge::{BuiltinTokenizer, reconcile};
+
+/// Merges three versions of a file: mine, base, and theirs.
+/// Implement a trivial version git merge-file (https://git-scm.com/docs/git-merge-file)
+///
+/// Run it with:
+/// `cargo run --example merge-file my.txt base.txt their.txt [output_file.txt]`
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() < 4 || args.len() > 5 {
+        eprintln!("Usage: merge-file <mine> <base> <theirs> [output]");
+        process::exit(1);
+    }
+
+    let mine_file = &args[1];
+    let base_file = &args[2];
+    let theirs_file = &args[3];
+    let output_file = args.get(4);
+
+    // Read files
+    let mine_content = fs::read_to_string(mine_file).unwrap_or_else(|e| {
+        eprintln!("Error reading {}: {}", mine_file, e);
+        process::exit(1);
+    });
+
+    let base_content = fs::read_to_string(base_file).unwrap_or_else(|e| {
+        eprintln!("Error reading {}: {}", base_file, e);
+        process::exit(1);
+    });
+
+    let theirs_content = fs::read_to_string(theirs_file).unwrap_or_else(|e| {
+        eprintln!("Error reading {}: {}", theirs_file, e);
+        process::exit(1);
+    });
+
+    // Perform the merge using reconcile
+    let result = reconcile(
+        &base_content,
+        &mine_content.into(),
+        &theirs_content.into(),
+        &*BuiltinTokenizer::Word,
+    );
+
+    let merged_content = result.apply().text();
+
+    // Write the result
+    if let Some(output_path) = output_file {
+        if let Err(e) = fs::write(output_path, merged_content) {
+            eprintln!("Error writing to {}: {}", output_path, e);
+            process::exit(1);
+        }
+    } else {
+        print!("{}", merged_content);
+    }
+}