Add compact language assistance rails

src/lsp.zig

@@ -163,6 +163,52 @@ pub fn missingProviderRowAlloc(allocator: std.mem.Allocator, capability: Provide
     return std.fmt.allocPrint(allocator, "provider:missing:{s}", .{@tagName(capability)});
 }
 
+pub fn compactHoverCardAlloc(allocator: std.mem.Allocator, row: []const u8, width: usize) ![]u8 {
+    const provider = providerIdFromRow(row) catch "unknown";
+    const payload = providerPayloadFromRow(row) catch row;
+    const prefix = "lsp:hover:";
+    const body = if (std.mem.startsWith(u8, payload, prefix)) payload[prefix.len..] else payload;
+    const split = std.mem.indexOfScalar(u8, body, '|') orelse body.len;
+    const headline = body[0..split];
+    const docs = if (split < body.len) body[split + 1 ..] else "";
+    const budget = if (width > provider.len + headline.len + 8) width - provider.len - headline.len - 8 else 0;
+    const excerpt_len = @min(docs.len, budget);
+    return std.fmt.allocPrint(allocator, "[{s}] {s}{s}{s}", .{ provider, headline, if (excerpt_len > 0) " — " else "", docs[0..excerpt_len] });
+}
+
+pub fn expandedHoverRowsAlloc(allocator: std.mem.Allocator, row: []const u8, width: usize) ![][]const u8 {
+    const provider = providerIdFromRow(row) catch "unknown";
+    const payload = providerPayloadFromRow(row) catch row;
+    const prefix = "lsp:hover:";
+    const body = if (std.mem.startsWith(u8, payload, prefix)) payload[prefix.len..] else payload;
+    var rows = std.ArrayList([]const u8).empty;
+    errdefer {
+        for (rows.items) |item| allocator.free(item);
+        rows.deinit(allocator);
+    }
+    try rows.append(allocator, try std.fmt.allocPrint(allocator, "hover_provider:{s}", .{provider}));
+    var start: usize = 0;
+    const wrap = @max(width, 8);
+    while (start < body.len) {
+        const end = @min(start + wrap, body.len);
+        const wrapped = try allocator.dupe(u8, body[start..end]);
+        for (wrapped) |*byte| {
+            if (byte.* <= 0x20 or byte.* == '|') byte.* = '_';
+        }
+        try rows.append(allocator, wrapped);
+        start = end;
+    }
+    return rows.toOwnedSlice(allocator);
+}
+
+pub fn compactSignatureCardAlloc(allocator: std.mem.Allocator, row: []const u8) ![]u8 {
+    const provider = providerIdFromRow(row) catch "unknown";
+    const payload = providerPayloadFromRow(row) catch row;
+    const prefix = "lsp:signature:";
+    const body = if (std.mem.startsWith(u8, payload, prefix)) payload[prefix.len..] else payload;
+    return std.fmt.allocPrint(allocator, "[{s}] {s}", .{ provider, body });
+}
+
 pub fn providerPickerRowsAlloc(allocator: std.mem.Allocator, capability: ProviderCapability, providers: []const Provider) ![][]const u8 {
     var rows = std.ArrayList([]const u8).empty;
     errdefer {