From 2364cadfd5070c146ade07290652e1ad4f738c54 Mon Sep 17 00:00:00 2001
From: grimhilt <grimhilt@users.noreply.github.com>
Date: Sat, 31 Aug 2024 19:42:44 +0200
Subject: [PATCH] feat(nsignore): implement nsignore

---
 src/store/nsignore.rs | 144 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 src/store/nsignore.rs

diff --git a/src/store/nsignore.rs b/src/store/nsignore.rs
new file mode 100644
index 0000000..d0e64b6
--- /dev/null
+++ b/src/store/nsignore.rs
@@ -0,0 +1,144 @@
+use regex::Regex;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::path::PathBuf;
+
+/// Search .nsignore or .nextsyncignore in this path level
+///
+/// * `level_path`: the dir we want to find the ignore file in
+pub fn get_nsignore_file(level_path: &PathBuf) -> Option<PathBuf> {
+    let mut path = level_path.to_path_buf();
+
+    path.push(".nextsyncignore");
+    if path.exists() {
+        return Some(path);
+    }
+
+    path.pop();
+    path.push(".nsignore");
+    if path.exists() {
+        return Some(path);
+    }
+
+    None
+}
+
+pub fn get_nsignore_rules(nsignore_path: &PathBuf) -> Vec<String> {
+    let file = File::open(nsignore_path).expect(&format!(
+        "fatal: failed to open nextsyncignore file in '{}'",
+        nsignore_path.display()
+    ));
+
+    let reader = BufReader::new(file);
+    reader
+        .lines()
+        .map(|rule| normalize_rule(rule.unwrap()))
+        .collect()
+}
+
+fn normalize_rule(l: String) -> String {
+    let mut line = l;
+
+    // define / as root
+    let re = Regex::new("^(!)?/").unwrap();
+    line = re.replace_all(&line, "$1^").to_string();
+
+    // escape .
+    let re = Regex::new(r"\.").unwrap();
+    line = re.replace_all(&line, r"\.").to_string();
+
+    // add . before *
+    let re = Regex::new(r"\*").unwrap();
+    line = re.replace_all(&line, r".*").to_string();
+
+    // add optional .* at the end of /
+    let re = Regex::new(r"/$").unwrap();
+    line = re.replace_all(&line, r"(/.*)?").to_string();
+    line
+}
+
+pub fn is_file_ignored(path: &str, rules: &Vec<String>) -> bool {
+    let mut ignored = false;
+    for rule in rules {
+        if rule.starts_with("!") {
+            if !ignored {
+                continue;
+            }
+
+            let strip_rule = rule.strip_prefix("!").unwrap();
+            let re = Regex::new(&strip_rule).unwrap();
+            if re.is_match(path) {
+                ignored = false;
+            }
+        } else if !ignored {
+            let re = Regex::new(&rule).unwrap();
+            if re.is_match(path) {
+                ignored = true;
+            }
+        }
+    }
+    ignored
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::io::Cursor;
+
+    fn test_multiple(rules: Vec<&str>, tests: Vec<(&str, bool)>) {
+        let rules = rules
+            .iter()
+            .map(|rule| normalize_rule(rule.to_string()))
+            .collect();
+        for (file, res) in tests.into_iter() {
+            assert_eq!(is_file_ignored(file, &rules), res, "{}", file);
+        }
+    }
+
+    #[test]
+    fn test_ignore_files() {
+        let rules = vec![
+            "*.log",
+            "exclude",
+            "/logs/",
+            "/build/target/",
+            "**/*.swp",
+            "secret/",
+        ];
+
+        let tests = vec![
+            ("error.log", true),
+            ("./error.log", true),
+            ("dir/error.log", true),
+            ("exclude", true),
+            ("dir/exclude", true),
+            ("logs/dir/file2", true),
+            ("dir/logs/dir/file2", false),
+            ("build/target/dir/file1", true),
+            ("build", false),
+            ("build/target", true),
+            ("dir/build/target", false),
+            ("dir/file.swp", true),
+            (".swp", false),
+            ("secret", true),
+            ("dir/secret", true),
+            ("dir/secret/file", true),
+        ];
+
+        test_multiple(rules, tests);
+    }
+
+    #[test]
+    fn test_ignore_files_negation() {
+        let rules = vec!["*", "!*.log", "!*log.*"];
+        let tests = vec![
+            ("file", true),
+            ("dir/file", true),
+            ("file.log", false),
+            ("log.file", false),
+            ("dir/file.log", false),
+            ("dir/log.file", false),
+        ];
+        test_multiple(rules, tests);
+    }
+}