Add incoming_calls and outgoing_calls tools

README.md

@@ -178,6 +178,8 @@ This is an [MCP](https://modelcontextprotocol.io/introduction) server that runs
 - `hover`: Display documentation, type hints, or other hover information for a given location.
 - `rename_symbol`: Rename a symbol across a project.
 - `edit_file`: Allows making multiple text edits to a file based on line numbers. Provides a more reliable and context-economical way to edit files compared to search and replace based edit tools.
+- `callers`: Shows all locations that call a given symbol
+- `callees`: Shows all functions that a given symbol calls
 
 ## About
 

integrationtests/snapshots/go/call_hierarchy/incoming-other-file.snap

@@ -0,0 +1,14 @@
+
+---
+Name: HelperFunction
+Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • helper.go
+/TEST_OUTPUT/workspace/helper.go
+Range: L4:C6 - L4:C20
+- Called By: AnotherConsumer
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • another_consumer.go
+/TEST_OUTPUT/workspace/another_consumer.go
+  Range: L6:C6 - L6:C21
+- Called By: ConsumerFunction
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • consumer.go
+/TEST_OUTPUT/workspace/consumer.go
+  Range: L6:C6 - L6:C22

integrationtests/snapshots/go/call_hierarchy/incoming-same-file.snap

@@ -0,0 +1,10 @@
+
+---
+Name: FooBar
+Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • main.go
+/TEST_OUTPUT/workspace/main.go
+Range: L6:C6 - L6:C12
+- Called By: main
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • main.go
+/TEST_OUTPUT/workspace/main.go
+  Range: L12:C6 - L12:C10

integrationtests/snapshots/go/call_hierarchy/outgoing-other-file.snap

@@ -0,0 +1,26 @@
+
+---
+Name: ConsumerFunction
+Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • consumer.go
+/TEST_OUTPUT/workspace/consumer.go
+Range: L6:C6 - L6:C22
+- Calls: GetName
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • types.go
+/TEST_OUTPUT/workspace/types.go
+  Range: L21:C2 - L21:C9
+- Calls: HelperFunction
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • helper.go
+/TEST_OUTPUT/workspace/helper.go
+  Range: L4:C6 - L4:C20
+- Calls: Method
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • types.go
+/TEST_OUTPUT/workspace/types.go
+  Range: L14:C24 - L14:C30
+- Calls: Println
+  Detail: fmt • print.go
+/GOROOT/src/fmt/print.go
+  Range: L313:C6 - L313:C13
+- Calls: Process
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • types.go
+/TEST_OUTPUT/workspace/types.go
+  Range: L31:C24 - L31:C31

integrationtests/snapshots/go/call_hierarchy/outgoing-same-file.snap

@@ -0,0 +1,14 @@
+
+---
+Name: main
+Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • main.go
+/TEST_OUTPUT/workspace/main.go
+Range: L12:C6 - L12:C10
+- Calls: FooBar
+  Detail: github.com/isaacphi/mcp-language-server/integrationtests/test-output/go/workspace • main.go
+/TEST_OUTPUT/workspace/main.go
+  Range: L6:C6 - L6:C12
+- Calls: Println
+  Detail: fmt • print.go
+/GOROOT/src/fmt/print.go
+  Range: L313:C6 - L313:C13

integrationtests/tests/common/helpers.go

@@ -1,9 +1,11 @@
 package common
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -91,10 +93,25 @@ func CleanupTestSuites(suites ...*TestSuite) {
 	}
 }
 
+// use instead of runtime.GOROOT which is deprecated
+func getGoRoot() string {
+	cmd := exec.Command("go", "env", "GOROOT")
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	err := cmd.Run()
+	if err != nil {
+		panic(err)
+	}
+	return strings.TrimSpace(out.String())
+}
+
 // normalizePaths replaces absolute paths in the result with placeholder paths for consistent snapshots
 func normalizePaths(_ *testing.T, input string) string {
 	// No need to get the repo root - we're just looking for patterns
 
+	// But this is useful
+	goroot := getGoRoot()
+
 	// Simple approach: just replace any path segments that contain workspace/
 	lines := strings.Split(input, "\n")
 	for i, line := range lines {
@@ -116,6 +133,13 @@ func normalizePaths(_ *testing.T, input string) string {
 				lines[i] = "/TEST_OUTPUT/workspace/" + parts[1]
 			}
 		}
+		if strings.Contains(line, goroot) {
+			parts := strings.Split(line, goroot)
+			if len(parts) > 1 {
+				// Replace with a simple placeholder path
+				lines[i] = "/GOROOT" + parts[1]
+			}
+		}
 	}
 
 	return strings.Join(lines, "\n")

integrationtests/tests/go/call_hierarchy/incoming_test.go

@@ -0,0 +1,58 @@
+package callhierarchy_test
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/isaacphi/mcp-language-server/integrationtests/tests/common"
+	"github.com/isaacphi/mcp-language-server/integrationtests/tests/go/internal"
+	"github.com/isaacphi/mcp-language-server/internal/tools"
+)
+
+func TestIncomingCalls(t *testing.T) {
+	suite := internal.GetTestSuite(t)
+
+	ctx, cancel := context.WithTimeout(suite.Context, 10*time.Second)
+	defer cancel()
+
+	tests := []struct {
+		name         string
+		symbolName   string
+		expectedText string
+		snapshotName string
+	}{
+		{
+			name:         "Function with calls in same file",
+			symbolName:   "FooBar",
+			expectedText: ": main",
+			snapshotName: "incoming-same-file",
+		},
+		{
+			name:         "Function with calls in other file",
+			symbolName:   "HelperFunction",
+			expectedText: "ConsumerFunction",
+			snapshotName: "incoming-other-file",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			// Call the GetIncomingCalls tool
+			result, err := tools.GetCallers(ctx, suite.Client, tc.symbolName, 1)
+			if err != nil {
+				t.Fatalf("Failed to find incoming calls: %v", err)
+			}
+
+			// Check that the result contains relevant information
+			if !strings.Contains(result, tc.expectedText) {
+				t.Errorf("Incoming calls do not contain expected text: %s", tc.expectedText)
+			}
+
+			// Use snapshot testing to verify exact output
+			common.SnapshotTest(t, "go", "call_hierarchy", tc.snapshotName, result)
+		})
+	}
+
+}

integrationtests/tests/go/call_hierarchy/outgoing_test.go

@@ -0,0 +1,58 @@
+package callhierarchy_test
+
+import (
+	"context"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/isaacphi/mcp-language-server/integrationtests/tests/common"
+	"github.com/isaacphi/mcp-language-server/integrationtests/tests/go/internal"
+	"github.com/isaacphi/mcp-language-server/internal/tools"
+)
+
+func TestOutgoingCalls(t *testing.T) {
+	suite := internal.GetTestSuite(t)
+
+	ctx, cancel := context.WithTimeout(suite.Context, 10*time.Second)
+	defer cancel()
+
+	tests := []struct {
+		name         string
+		symbolName   string
+		expectedText string
+		snapshotName string
+	}{
+		{
+			name:         "Function with calls in other file",
+			symbolName:   "ConsumerFunction",
+			expectedText: "HelperFunction",
+			snapshotName: "outgoing-other-file",
+		},
+		{
+			name:         "Function with calls in same file",
+			symbolName:   "main",
+			expectedText: "FooBar",
+			snapshotName: "outgoing-same-file",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			// Call the GetOutgoingCalls tool
+			result, err := tools.GetCallees(ctx, suite.Client, tc.symbolName, 1)
+			if err != nil {
+				t.Fatalf("Failed to find outgoing calls: %v", err)
+			}
+
+			// Check that the result contains relevant information
+			if !strings.Contains(result, tc.expectedText) {
+				t.Errorf("Outgoing calls do not contain expected text: %s", tc.expectedText)
+			}
+
+			// Use snapshot testing to verify exact output
+			common.SnapshotTest(t, "go", "call_hierarchy", tc.snapshotName, result)
+		})
+	}
+
+}