From 413d919719a57304a0eee0e612052ece3c8fd2f0 Mon Sep 17 00:00:00 2001
From: Myzel394 <50424412+Myzel394@users.noreply.github.com>
Date: Thu, 3 Oct 2024 14:27:05 +0200
Subject: [PATCH] feat(ssh_config): Add hover support

---
 handlers/ssh_config/handlers/hover.go         | 59 +++++++++++++++++++
 .../ssh_config/lsp/text-document-hover.go     | 22 ++++++-
 2 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 handlers/ssh_config/handlers/hover.go

diff --git a/handlers/ssh_config/handlers/hover.go b/handlers/ssh_config/handlers/hover.go
new file mode 100644
index 0000000..42839ea
--- /dev/null
+++ b/handlers/ssh_config/handlers/hover.go
@@ -0,0 +1,59 @@
+package handlers
+
+import (
+	"config-lsp/common"
+	"config-lsp/handlers/ssh_config/ast"
+	"config-lsp/handlers/ssh_config/fields"
+	"strings"
+
+	protocol "github.com/tliron/glsp/protocol_3_16"
+)
+
+func GetHoverInfoForOption(
+	option *ast.SSHOption,
+	line uint32,
+	index common.IndexPosition,
+) (*protocol.Hover, error) {
+	docValue, found := fields.Options[option.Key.Key]
+
+	if !found {
+		return nil, nil
+	}
+
+	if option.Key.ContainsPosition(index) {
+		optionName := fields.FieldsNameFormattedMap[option.Key.Key]
+		contents := []string{
+			"## " + optionName,
+			"",
+		}
+		contents = append(contents, docValue.Documentation)
+		contents = append(contents, []string{
+			"",
+			"---",
+			"",
+		}...)
+		contents = append(contents, []string{
+			"### Type",
+			"",
+		}...)
+		contents = append(contents, docValue.GetTypeDescription()...)
+
+		return &protocol.Hover{
+			Contents: strings.Join(contents, "\n"),
+		}, nil
+	}
+
+	if option.OptionValue != nil && option.OptionValue.ContainsPosition(index) {
+		line := option.OptionValue.Value.Raw
+		contents := docValue.DeprecatedFetchHoverInfo(
+			line,
+			uint32(option.OptionValue.Start.GetRelativeIndexPosition(index)),
+		)
+
+		return &protocol.Hover{
+			Contents: strings.Join(contents, "\n"),
+		}, nil
+	}
+
+	return nil, nil
+}
diff --git a/handlers/ssh_config/lsp/text-document-hover.go b/handlers/ssh_config/lsp/text-document-hover.go
index 61d19cd..789dbbd 100644
--- a/handlers/ssh_config/lsp/text-document-hover.go
+++ b/handlers/ssh_config/lsp/text-document-hover.go
@@ -1,6 +1,10 @@
 package lsp
 
 import (
+	"config-lsp/common"
+	sshconfig "config-lsp/handlers/ssh_config"
+	"config-lsp/handlers/ssh_config/handlers"
+
 	"github.com/tliron/glsp"
 	protocol "github.com/tliron/glsp/protocol_3_16"
 )
@@ -9,5 +13,21 @@ func TextDocumentHover(
 	context *glsp.Context,
 	params *protocol.HoverParams,
 ) (*protocol.Hover, error) {
-	return nil, nil
+	line := params.Position.Line
+	index := common.LSPCharacterAsIndexPosition(params.Position.Character)
+
+	d := sshconfig.DocumentParserMap[params.TextDocument.URI]
+
+	option, _ := d.Config.FindOption(line)
+
+	if option == nil || option.Key == nil {
+		// Empty line
+		return nil, nil
+	}
+
+	return handlers.GetHoverInfoForOption(
+		option,
+		line,
+		index,
+	)
 }