From dab683f24f00057006d55aed91a14b8ce731780f Mon Sep 17 00:00:00 2001
From: jan <jan.zens@pm.me>
Date: Fri, 5 Aug 2022 10:27:27 +0200
Subject: [PATCH 1/2] implement show hover

---
 internal/lsp/general.go    |  2 +-
 internal/lsp/hover.go      | 31 +++++++++++++++++++++++++++++++
 internal/lsp/server_gen.go |  4 ++--
 3 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 internal/lsp/hover.go

diff --git a/internal/lsp/general.go b/internal/lsp/general.go
index e2305709..f56a8e50 100644
--- a/internal/lsp/general.go
+++ b/internal/lsp/general.go
@@ -66,7 +66,7 @@ func (s *Server) initialize(ctx context.Context, params *protocol.ParamInitializ
 			DocumentSymbolProvider:     true,
 			WorkspaceSymbolProvider:    false,
 			FoldingRangeProvider:       false,
-			HoverProvider:              false,
+			HoverProvider:              true,
 			DocumentHighlightProvider:  false,
 			DocumentLinkProvider:       protocol.DocumentLinkOptions{},
 			ReferencesProvider:         true,
diff --git a/internal/lsp/hover.go b/internal/lsp/hover.go
new file mode 100644
index 00000000..2211b54c
--- /dev/null
+++ b/internal/lsp/hover.go
@@ -0,0 +1,31 @@
+package lsp
+
+import (
+	"context"
+	"fmt"
+	"github.com/nokia/ntt/internal/log"
+	"github.com/nokia/ntt/internal/lsp/protocol"
+	"github.com/nokia/ntt/ttcn3"
+	"github.com/nokia/ntt/ttcn3/ast"
+)
+
+func (s *Server) hover(ctx context.Context, params *protocol.HoverParams) (protocol.Hover, error) {
+	var (
+		file = string(params.TextDocument.URI.SpanURI())
+		line = int(params.Position.Line) + 1
+		col  = int(params.Position.Character) + 1
+	)
+
+	tree := ttcn3.ParseFile(file)
+	x := tree.ExprAt(tree.Pos(line, col))
+	if x == nil {
+		log.Debug(fmt.Sprintf("No expression at %s:%d:%d\n", file, line, col))
+	}
+
+	comment := ast.FirstToken(x).Comments()
+
+	hoverContents := protocol.MarkupContent{Kind: "Plaintext", Value: comment}
+	hover := protocol.Hover{Contents: hoverContents}
+
+	return hover, nil
+}
diff --git a/internal/lsp/server_gen.go b/internal/lsp/server_gen.go
index c24b607f..dba0cf4f 100644
--- a/internal/lsp/server_gen.go
+++ b/internal/lsp/server_gen.go
@@ -104,8 +104,8 @@ func (s *Server) Formatting(context.Context, *protocol.DocumentFormattingParams)
 	return nil, notImplemented("Formatting")
 }
 
-func (s *Server) Hover(context.Context, *protocol.HoverParams) (*protocol.Hover, error) {
-	return nil, notImplemented("Hover")
+func (s *Server) Hover(ctx context.Context, params *protocol.HoverParams) (*protocol.Hover, error) {
+	return s.hover(ctx, params), nil
 }
 
 func (s *Server) Implementation(context.Context, *protocol.ImplementationParams) (interface{}, error) {

From 5a67cb97ea1159a055ef3b1b143596abe2b42627 Mon Sep 17 00:00:00 2001
From: jan <jan.zens@pm.me>
Date: Fri, 5 Aug 2022 18:26:14 +0200
Subject: [PATCH 2/2] implement show hover

---
 internal/lsp/hover.go      | 6 +++---
 internal/lsp/server_gen.go | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/internal/lsp/hover.go b/internal/lsp/hover.go
index 2211b54c..ee4aad39 100644
--- a/internal/lsp/hover.go
+++ b/internal/lsp/hover.go
@@ -9,7 +9,7 @@ import (
 	"github.com/nokia/ntt/ttcn3/ast"
 )
 
-func (s *Server) hover(ctx context.Context, params *protocol.HoverParams) (protocol.Hover, error) {
+func (s *Server) hover(ctx context.Context, params *protocol.HoverParams) (*protocol.Hover, error) {
 	var (
 		file = string(params.TextDocument.URI.SpanURI())
 		line = int(params.Position.Line) + 1
@@ -24,8 +24,8 @@ func (s *Server) hover(ctx context.Context, params *protocol.HoverParams) (proto
 
 	comment := ast.FirstToken(x).Comments()
 
-	hoverContents := protocol.MarkupContent{Kind: "Plaintext", Value: comment}
-	hover := protocol.Hover{Contents: hoverContents}
+	hoverContents := protocol.MarkupContent{Kind: "markdown", Value: comment}
+	hover := &protocol.Hover{Contents: hoverContents}
 
 	return hover, nil
 }
diff --git a/internal/lsp/server_gen.go b/internal/lsp/server_gen.go
index dba0cf4f..86f321d3 100644
--- a/internal/lsp/server_gen.go
+++ b/internal/lsp/server_gen.go
@@ -105,7 +105,7 @@ func (s *Server) Formatting(context.Context, *protocol.DocumentFormattingParams)
 }
 
 func (s *Server) Hover(ctx context.Context, params *protocol.HoverParams) (*protocol.Hover, error) {
-	return s.hover(ctx, params), nil
+	return s.hover(ctx, params)
 }
 
 func (s *Server) Implementation(context.Context, *protocol.ImplementationParams) (interface{}, error) {