From 1886a9b3ff464d43f296603d8a95126f0c1a2a5a Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Mon, 4 Apr 2022 20:25:23 +0300
Subject: feat: put re-usable parts into crate library

Sponsored-by: author
---
 src/bin/cachedir.rs | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/src/bin/cachedir.rs b/src/bin/cachedir.rs
index 4d35ae8..0675248 100644
--- a/src/bin/cachedir.rs
+++ b/src/bin/cachedir.rs
@@ -12,17 +12,12 @@
 //! $
 //! ~~~
 
+use cachedir::{is_cachedir_tag, CACHEDIR_TAG, TAG};
 use clap::{Parser, Subcommand};
-use std::fs::{read, remove_file, write};
-use std::path::{Path, PathBuf};
+use std::fs::{remove_file, write};
+use std::path::PathBuf;
 use walkdir::{DirEntry, WalkDir};
 
-/// Name of tag file.
-const CACHEDIR_TAG: &str = "CACHEDIR.TAG";
-
-/// Prefix of contents of tag file.
-const TAG: &str = "Signature: 8a477f597d28d172789f06886806bc55";
-
 /// The main program.
 fn main() {
     if let Err(e) = real_main() {
@@ -115,20 +110,6 @@ where
     Ok(())
 }
 
-/// Is the given file a cache directory tag?
-fn is_cachedir_tag(filename: &Path) -> Result<bool, std::io::Error> {
-    if filename.exists() {
-        let data = read(filename)?;
-        if data.len() >= TAG.len() {
-            Ok(&data[..TAG.len()] == TAG.as_bytes())
-        } else {
-            Ok(false)
-        }
-    } else {
-        Ok(false)
-    }
-}
-
 /// Return path to tag file in a directory.
 fn tag_filename(entry: &DirEntry) -> PathBuf {
     entry.path().join(CACHEDIR_TAG)
-- 
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