moved hashing to shellscript to check for posts

removes dependency on sha2 crate and allows users
to choose their own hashing algorithm easily.

now copies clinte.json to $HOME/.clinte.json once
the posts are viewed. a shellscript can be used to
compare the hash of the global clinte.json to the
hash of the copy. an example script is supplied.

on `make install` the example script is installed
to /etc/profile.d/, where it will be run for users
on login.

1 files changed, 16 insertions, 1 deletions

diff --git a/src/posts.rs b/src/posts.rs
index 0de3d52..1dfd167 100644
--- a/src/posts.rs
+++ b/src/posts.rs
@@ -1,5 +1,8 @@
 use std::io;
 
+#[cfg(not(test))]
+use std::{env, fs};
+
 use crate::conf;
 use crate::db;
 use crate::error;
@@ -83,7 +86,6 @@ pub fn display() -> error::Result<()> {
         .unwrap_or_else(|_| 80);
 
     let all = db::Posts::get_all(db::PATH);
-    all.hash()?;
 
     let mut postvec = Vec::new();
     all.posts().iter().enumerate().for_each(|(id, post)| {
@@ -117,6 +119,19 @@ pub fn display() -> error::Result<()> {
         }
     }
 
+    // copy the json file to the user's home directory
+    // so it can be compared to the global file to check
+    // for new posts.
+    // previously, I'd hashed it, but I feel like it's
+    // better to leave the hashing to UNIX utilities
+    // than to add a heavy-ish dependency.
+    #[cfg(not(test))]
+    {
+        let homedir = env::var("HOME")?;
+        let localdest = format!("{}/.clinte.json", homedir);
+        fs::copy(db::PATH, localdest)?;
+    }
+
     Ok(())
 }