resolve some warnings

Author: gcanat

text/diff_util/change.rs

@@ -20,26 +20,7 @@ pub enum Change {
     Substitute(ChangeData),
 }
 
-pub struct ChangeContext {
-    pub change: Change,
-    pub ln1_start: usize,
-    pub ln1_end: usize,
-    pub hk1_start: usize,
-    pub hk1_end: usize,
-    pub ln2_start: usize,
-    pub ln2_end: usize,
-    pub hk2_start: usize,
-    pub hk2_end: usize,
-}
-
 impl Change {
-    pub fn is_none(&self) -> bool {
-        *self == Change::None
-    }
-
-    pub fn is_unchanged(&self) -> bool {
-        *self == Change::Unchanged(Default::default())
-    }
 
     pub fn get_ln1(&self) -> usize {
         match self {

text/diff_util/file_diff.rs

@@ -93,7 +93,6 @@ impl<'a> FileDiff<'a> {
                 &mut lcs_indices,
             );
 
-            println!("lcs_indices: {:?}", lcs_indices);
             diff.hunks
                 .create_hunks_from_lcs(&lcs_indices, num_lines1, num_lines2);
 

text/diff_util/hunks.rs

@@ -283,12 +283,12 @@ impl Hunks {
         num_lines2: usize,
     ) {
         let mut hunk_start1 = 0;
-        let mut hunk_end1 = 0;
+        let mut hunk_end1: usize;
         let mut hunk_start2 = 0;
-        let mut hunk_end2 = 0;
+        let mut hunk_end2: usize;
         let mut prev_val = 0 as i32;
         for i in 0..lcs_indices.len() {
-            if ((lcs_indices[i] == -1) && (prev_val != -1)) {
+            if (lcs_indices[i] == -1) && (prev_val != -1) {
                 // We reach a new deletion/substitution block
                 hunk_start1 = i;
                 hunk_start2 = if prev_val == 0 {