Add colored blocks

CHANGELOG.md

@@ -7,13 +7,14 @@
     - `t` now truncates the file (it was `T` before).
     - `T` reverse truncates the file (deletes from offset 0 to current offset).
     - Both commands above need confirmation from the user as they can't be undone.
-  - Selection mode: 
+  - Selection mode:
     - Bug fix: selection no longer disappears when selected range is bigger than page size.
+    - Users can now mark colored blocks with `Alt-m`. Press multiple times to change colors. `[` and `]` keys navigate to marked block boundaries.
 
 ## dz6 v0.6.0
 
 - Hex view:
-  -  `Ctrl+f` goes down one page (same as `PgDown`).
+  - `Ctrl+f` goes down one page (same as `PgDown`).
   - `Ctrl+b` goes up one page (same as `PgUp`).
   - `~` changes case when applicable (available in Normal, Replace, and Select modes).
   - `Ctrl+a`, `Ctrl+x`, `n`, and `z` work without putting the editor in Replace mode.
@@ -57,25 +58,25 @@
 - Basic support for multibyte selection. Press `v` (like visual mode in vim), then select a byte range. Then, `y` to copy bytes to clipboard, `z` to fill them with zeroes, or `n` to fill them with x86 NOPs.
 - Support for initialization file at `$HOME/.gdbinit`. Commands added to this file will be executed at startup (one per line). (https://github.com/mentebinaria/dz6/issues/12)
 - New `:` commands:
-    - `set db` turn on database loading/saving (default)
-    - `set nodb` turn off the above
+  - `set db` turn on database loading/saving (default)
+  - `set nodb` turn off the above
 
 ## dz6 v0.4.0
 
 - Status bar now shows "COMMAND" when you press `:`.
 - New `:` commands:
-    - `cmt <offset> <comment>` (programatic alternative to `;`)
-    - `set byteline <number>` sets the number of bytes per line in the hex dump
-    - `set ctrlchar <char>`sets the character shown for ASCII non-graphical byte values
-    - `set dimzero` dim nullbytes
-    - `set dimctrl` dim all control characters
-    - `set nodim` turn off dimming
-    - `set theme` changes the theme
-    - `w` write changes to file
-    - `wq` or `x` write changes to file and quit
+  - `cmt <offset> <comment>` (programatic alternative to `;`)
+  - `set byteline <number>` sets the number of bytes per line in the hex dump
+  - `set ctrlchar <char>`sets the character shown for ASCII non-graphical byte values
+  - `set dimzero` dim nullbytes
+  - `set dimctrl` dim all control characters
+  - `set nodim` turn off dimming
+  - `set theme` changes the theme
+  - `w` write changes to file
+  - `wq` or `x` write changes to file and quit
 - In-memory buffer when patching bytes. Nothing is written to the file until you use some of the writing commands (`w`, `wq` or `x`), but truncating is an exception (`T` in replace mode).
- - Light theme.
-- dz6 beeps if you try  to enter replace mode when editing a read-only file.
+- Light theme.
+- dz6 beeps if you try to enter replace mode when editing a read-only file.
 
 ## dz6 v0.3.1
 

Cargo.toml

@@ -20,6 +20,7 @@ evalexpr = "13.1.*"
 hex = "0.4.3"
 memchr = "2.8.0"
 mmap-io = "0.9.4"
+rand = "0.10.1"
 ratatui = "0.30.0"
 regex = "1.11.2"
 serde = { version = "1.0.228", features = ["derive"] }

src/database.rs

@@ -14,7 +14,10 @@ impl App {
         let target_db: PathBuf = target_dir.join(&cwd_db);
 
         // if there's nothing to be saved, delete any existing db files and return
-        if self.hex_view.bookmarks.is_empty() && self.hex_view.comment_name_list.is_empty() {
+        if self.hex_view.bookmarks.is_empty()
+            && self.hex_view.comment_name_list.is_empty()
+            && self.hex_view.blocks.is_empty()
+        {
             let _ = fs::remove_file(target_db);
             let _ = fs::remove_file(cwd_db);
             return Ok(());

src/hex/blocks.rs

@@ -0,0 +1,32 @@
+use rand::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Default, Serialize, Deserialize, PartialEq, Eq, PartialOrd)]
+pub struct ColoredBlock {
+    pub start: usize,
+    pub end: usize,
+    pub bg_color: u32,
+    pub fg_color: u32,
+}
+
+fn get_random_color() -> u32 {
+    let mut rng = rand::rng();
+
+    rng.random::<u32>()
+}
+
+impl ColoredBlock {
+    pub fn new(start: usize, end: usize) -> Self {
+        ColoredBlock {
+            start,
+            end,
+            bg_color: get_random_color(),
+            fg_color: get_random_color(),
+        }
+    }
+
+    pub fn set_random_color(&mut self) {
+        self.bg_color = get_random_color();
+        self.fg_color = get_random_color();
+    }
+}