feat(pkgs/back): Rewrite the `git-bug` interface code

The previous code was more or less reverse engineered, whilst this code
is based on the actually git-bug source code. This improves the whole
issue and operation handling immensely and also makes the code better
maintainable. Furthermore, it also adds support for the operations that
had not already used in `vhack.eu/nixos-server.git`.

1 files changed, 85 insertions, 0 deletions

diff --git a/pkgs/by-name/ba/back/src/git_bug/issue/label/mod.rs b/pkgs/by-name/ba/back/src/git_bug/issue/label/mod.rs
new file mode 100644
index 0000000..a971234
--- /dev/null
+++ b/pkgs/by-name/ba/back/src/git_bug/issue/label/mod.rs
@@ -0,0 +1,85 @@
+// Back - An extremely simple git issue tracking system. Inspired by tvix's
+// panettone
+//
+// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This file is part of Back.
+//
+// You should have received a copy of the License along with this program.
+// If not, see <https://www.gnu.org/licenses/agpl.txt>.
+
+use std::fmt::Display;
+
+use serde::Deserialize;
+use sha2::{Digest, Sha256};
+
+use crate::git_bug::format::HtmlString;
+
+#[derive(Debug, Deserialize, PartialEq, Eq, Clone)]
+pub struct Label {
+    value: HtmlString,
+}
+
+impl Display for Label {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.value.fmt(f)
+    }
+}
+
+impl Label {
+    /// RGBA from a Label computed in a deterministic way
+    /// This is taken completely from `git_bug`
+    pub fn associate_color(&self) -> Color {
+        // colors from: https://material-ui.com/style/color/
+        let colors = vec![
+            Color::from_rgba(244, 67, 54, 255),   // red
+            Color::from_rgba(233, 30, 99, 255),   // pink
+            Color::from_rgba(156, 39, 176, 255),  // purple
+            Color::from_rgba(103, 58, 183, 255),  // deepPurple
+            Color::from_rgba(63, 81, 181, 255),   // indigo
+            Color::from_rgba(33, 150, 243, 255),  // blue
+            Color::from_rgba(3, 169, 244, 255),   // lightBlue
+            Color::from_rgba(0, 188, 212, 255),   // cyan
+            Color::from_rgba(0, 150, 136, 255),   // teal
+            Color::from_rgba(76, 175, 80, 255),   // green
+            Color::from_rgba(139, 195, 74, 255),  // lightGreen
+            Color::from_rgba(205, 220, 57, 255),  // lime
+            Color::from_rgba(255, 235, 59, 255),  // yellow
+            Color::from_rgba(255, 193, 7, 255),   // amber
+            Color::from_rgba(255, 152, 0, 255),   // orange
+            Color::from_rgba(255, 87, 34, 255),   // deepOrange
+            Color::from_rgba(121, 85, 72, 255),   // brown
+            Color::from_rgba(158, 158, 158, 255), // grey
+            Color::from_rgba(96, 125, 139, 255),  // blueGrey
+        ];
+
+        let hash = Sha256::digest(self.to_string().as_bytes());
+
+        let id: usize = hash
+            .into_iter()
+            .map(|val| val as usize)
+            .fold(0, |acc, val| (acc + val) % colors.len());
+
+        colors[id]
+    }
+}
+
+#[derive(Default, Clone, Copy, Debug)]
+pub struct Color {
+    pub red: u32,
+    pub green: u32,
+    pub blue: u32,
+    pub alpha: u32,
+}
+
+impl Color {
+    pub fn from_rgba(red: u32, green: u32, blue: u32, alpha: u32) -> Self {
+        Self {
+            red,
+            green,
+            blue,
+            alpha,
+        }
+    }
+}