refactor: move file link parsing/dispatching out of main

src/file_link.zig

@@ -0,0 +1,65 @@
+const std = @import("std");
+const tp = @import("thespian");
+const root = @import("root");
+
+pub const Dest = union(enum) {
+    file: FileDest,
+    dir: DirDest,
+};
+
+pub const FileDest = struct {
+    path: []const u8,
+    line: ?usize = null,
+    column: ?usize = null,
+    end_column: ?usize = null,
+    exists: bool = false,
+};
+
+pub const DirDest = struct {
+    path: []const u8,
+};
+
+pub fn parse(link: []const u8) error{InvalidFileLink}!Dest {
+    if (link.len == 0) return error.InvalidFileLink;
+    var it = std.mem.splitScalar(u8, link, ':');
+    var dest: Dest = if (root.is_directory(link))
+        .{ .dir = .{ .path = link } }
+    else
+        .{ .file = .{ .path = it.first() } };
+    switch (dest) {
+        .file => |*file| {
+            if (it.next()) |line_|
+                file.line = std.fmt.parseInt(usize, line_, 10) catch blk: {
+                    file.path = link;
+                    break :blk null;
+                };
+            if (file.line) |_| if (it.next()) |col_| {
+                file.column = std.fmt.parseInt(usize, col_, 10) catch null;
+            };
+            if (file.column) |_| if (it.next()) |col_| {
+                file.end_column = std.fmt.parseInt(usize, col_, 10) catch null;
+            };
+            file.exists = root.is_file(file.path);
+        },
+        .dir => {},
+    }
+    return dest;
+}
+
+pub fn navigate(to: tp.pid_ref, link: *const Dest) anyerror!void {
+    switch (link.*) {
+        .file => |file| {
+            if (file.line) |l| {
+                if (file.column) |col| {
+                    try to.send(.{ "cmd", "navigate", .{ .file = file.path, .line = l, .column = col } });
+                    if (file.end_column) |end|
+                        try to.send(.{ "A", l, col - 1, end - 1 });
+                    return;
+                }
+                return to.send(.{ "cmd", "navigate", .{ .file = file.path, .line = l } });
+            }
+            return to.send(.{ "cmd", "navigate", .{ .file = file.path } });
+        },
+        else => {},
+    }
+}