From 597570ddef91aa6170b443e86ea741c67b4cb8d6 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Fri, 15 May 2026 23:34:59 +0900
Subject: feat(port): port Comparer.php

---
 crates/shirabe/src/package/comparer/comparer.rs | 133 ++++++++++++++++++++++++
 1 file changed, 133 insertions(+)

(limited to 'crates/shirabe/src/package/comparer')

diff --git a/crates/shirabe/src/package/comparer/comparer.rs b/crates/shirabe/src/package/comparer/comparer.rs
index 4f2db99..8f7f312 100644
--- a/crates/shirabe/src/package/comparer/comparer.rs
+++ b/crates/shirabe/src/package/comparer/comparer.rs
@@ -1 +1,134 @@
 //! ref: composer/src/Composer/Package/Comparer/Comparer.php
+
+use indexmap::IndexMap;
+use std::path::Path;
+
+use crate::util::platform::Platform;
+
+#[derive(Debug)]
+pub struct Comparer {
+    source: String,
+    update: String,
+    changed: IndexMap<String, Vec<String>>,
+}
+
+impl Comparer {
+    pub fn new() -> Self {
+        Self {
+            source: String::new(),
+            update: String::new(),
+            changed: IndexMap::new(),
+        }
+    }
+
+    pub fn set_source(&mut self, source: String) {
+        self.source = source;
+    }
+
+    pub fn set_update(&mut self, update: String) {
+        self.update = update;
+    }
+
+    pub fn get_changed(&self, explicated: bool) -> Option<IndexMap<String, Vec<String>>> {
+        let mut changed = self.changed.clone();
+        if changed.is_empty() {
+            return None;
+        }
+        if explicated {
+            for (section_key, item_section) in changed.iter_mut() {
+                let key = section_key.clone();
+                for item in item_section.iter_mut() {
+                    *item = format!("{} ({})", item, key);
+                }
+            }
+        }
+        Some(changed)
+    }
+
+    pub fn get_changed_as_string(&self, _to_string: bool, explicated: bool) -> String {
+        let changed = match self.get_changed(explicated) {
+            None => return String::new(),
+            Some(c) => c,
+        };
+
+        let mut strings: Vec<String> = vec![];
+        for (_section_key, item_section) in &changed {
+            for item in item_section {
+                strings.push(format!("{}\r\n", item));
+            }
+        }
+
+        strings.join("\r\n").trim().to_string()
+    }
+
+    pub fn do_compare(&mut self) {
+        let mut source: IndexMap<String, IndexMap<String, Option<String>>> = IndexMap::new();
+        let mut destination: IndexMap<String, IndexMap<String, Option<String>>> = IndexMap::new();
+        self.changed = IndexMap::new();
+        let current_directory = Platform::get_cwd();
+        shirabe_php_shim::chdir(&self.source);
+        if !Self::do_tree(".", &mut source) {
+            return;
+        }
+        shirabe_php_shim::chdir(&current_directory);
+        shirabe_php_shim::chdir(&self.update);
+        if !Self::do_tree(".", &mut destination) {
+            std::process::exit(0);
+        }
+        shirabe_php_shim::chdir(&current_directory);
+        for (dir, value) in &source {
+            for (file, hash) in value {
+                let dest_file_hash = destination.get(dir).and_then(|d| d.get(file));
+                if let Some(dest_hash) = dest_file_hash {
+                    if hash != dest_hash {
+                        self.changed.entry("changed".to_string()).or_default().push(format!("{}/{}", dir, file));
+                    }
+                } else {
+                    self.changed.entry("removed".to_string()).or_default().push(format!("{}/{}", dir, file));
+                }
+            }
+        }
+        for (dir, value) in &destination {
+            for (file, _hash) in value {
+                if !source.get(dir).map_or(false, |d| d.contains_key(file)) {
+                    self.changed.entry("added".to_string()).or_default().push(format!("{}/{}", dir, file));
+                }
+            }
+        }
+    }
+
+    fn do_tree(dir: &str, array: &mut IndexMap<String, IndexMap<String, Option<String>>>) -> bool {
+        if let Ok(read_dir) = std::fs::read_dir(dir) {
+            for entry in read_dir.flatten() {
+                let file: String = entry.file_name().to_string_lossy().into_owned();
+                if file == "." || file == ".." {
+                    continue;
+                }
+                let path = format!("{}/{}", dir, file);
+                if Path::new(&path).is_symlink() {
+                    let link_target = std::fs::read_link(&path).ok().and_then(|p| p.to_str().map(|s| s.to_string()));
+                    array.entry(dir.to_string()).or_default().insert(file, link_target);
+                } else if Path::new(&path).is_dir() {
+                    if array.is_empty() {
+                        array.insert("0".to_string(), IndexMap::new());
+                    }
+                    if !Self::do_tree(&path, array) {
+                        return false;
+                    }
+                } else if Path::new(&path).is_file() {
+                    let size = std::fs::metadata(&path).map(|m| m.len()).unwrap_or(0);
+                    if size > 0 {
+                        let algo = if shirabe_php_shim::PHP_VERSION_ID > 80100 { "xxh3" } else { "sha1" };
+                        let hash = shirabe_php_shim::hash_file(algo, &path);
+                        array.entry(dir.to_string()).or_default().insert(file, hash);
+                    }
+                }
+            }
+            if array.len() > 1 && array.contains_key("0") {
+                array.shift_remove("0");
+            }
+            return true;
+        }
+        false
+    }
+}
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