feat(nvim): simple one-level file tree

src/components/Nvim/NvimTree.tsx

@@ -1,11 +1,132 @@
+import { useState, useEffect } from "react";
 import { useTerminal } from "~/context/TerminalContext";
+import { type Cell } from "~/utils/terminal/cell";
 import { TerminalRenderer } from "~/utils/terminal/renderer";
+import { theme } from "~/utils/terminal/theme";
+
+const PATH_FOLDED: Cell = {
+  char: "",
+  foreground: theme.grey,
+};
+
+const PATH_UNFOLDED: Cell = {
+  char: "",
+  foreground: theme.blue,
+};
+
+const FILE_STYLES = {
+  directory: {
+    char: "\ue6ad", //  \ue6ad ||| \ueaf6
+    foreground: theme.blue,
+  },
+  md: {
+    char: "\ue73e",
+    foreground: theme.blue,
+  },
+  asc: {
+    char: "\uf43d",
+    foreground: theme.yellow,
+  },
+} as const satisfies Record<string, Cell>;
+
+type FileType = keyof typeof FILE_STYLES;
+
+type File = {
+  name: string;
+} & (
+  | {
+      type: Exclude<FileType, "directory">;
+    }
+  | {
+      type: "directory";
+      children: Array<File>;
+      folded: boolean;
+    }
+);
+
+const FILES_SRC: Array<File> = [
+  { name: "projects", type: "directory", children: [], folded: true },
+  { name: "README.md", type: "md" },
+  { name: "LICENSE.md", type: "md" },
+  { name: "prout", type: "directory", children: [], folded: true },
+  { name: "hello", type: "directory", children: [], folded: true },
+  { name: "pubkey.asc", type: "asc" },
+];
 
 export const NvimTree = () => {
-  const { cols: width, rows: height } = useTerminal();
-  const canvas = new TerminalRenderer(width * 0.15, height - 2);
+  const [selected, setSelected] = useState(0);
+  const [files, setFiles] = useState(
+    FILES_SRC.sort((a, b) => a.name.localeCompare(b.name)).sort((a, b) =>
+      a.type === "directory" && b.type !== "directory"
+        ? -1
+        : a.type !== "directory" && b.type === "directory"
+          ? 1
+          : 0,
+    ),
+  );
 
-  canvas.write(0, 0, "ijirjginrgi");
+  const { cols: width, rows: height } = useTerminal();
+  const canvas = new TerminalRenderer(width * 0.2, height - 2, {
+    background: "#0000001a",
+  });
+
+  const tree = new TerminalRenderer(canvas.width - 3, height - 1);
+
+  useEffect(() => {
+    const onScroll = (event: KeyboardEvent) => {
+      switch (event.key) {
+        case "ArrowUp":
+          setSelected(x => Math.max(0, x - 1));
+          break;
+
+        case "ArrowDown":
+          setSelected(x => Math.min(files.length - 1, x + 1));
+          break;
+
+        case "Enter":
+          const newFiles = [...files];
+
+          const file = newFiles[selected];
+          if (file?.type === "directory") {
+            file.folded = !file.folded;
+          }
+
+          setFiles(newFiles);
+          break;
+      }
+    };
+
+    window.addEventListener("keydown", onScroll);
+
+    return () => {
+      window.removeEventListener("keydown", onScroll);
+    };
+  });
+
+  tree.write(0, selected, " ".repeat(tree.width), { background: "#504651" });
+
+  files.forEach((file, y) => {
+    tree.apply(2, y, FILE_STYLES[file.type]);
+
+    if (file.type === "directory") {
+      tree.apply(0, y, file.folded ? PATH_FOLDED : PATH_UNFOLDED);
+
+      tree.write(4, y, file.name, {
+        foreground: FILE_STYLES.directory.foreground,
+      });
+    } else {
+      if (file.name === "README.md") {
+        tree.write(4, y, file.name, {
+          foreground: theme.yellow,
+          fontWeight: 800,
+        });
+      } else {
+        tree.write(4, y, file.name);
+      }
+    }
+  });
+
+  canvas.writeElement(tree, 2, 1);
 
   return <p>{canvas.render()}</p>;
 };