Create meaningful lines calculations.

README.md

@@ -47,6 +47,7 @@ $ git-velocity serve --port 8080
 - **Pull Requests**: Opened, merged, closed, average size, time to merge
 - **Code Reviews**: Reviews given, comments, approvals, response time
 - **Issues**: Opened, closed, comments
+- **Meaningful Lines**: Filter out comments, whitespace, and documentation changes from line counts
 
 ### 🎮 Gamification Engine
 - **Scoring System**: Earn points for every contribution
@@ -305,6 +306,7 @@ scoring:
     commit_with_tests: 15
     lines_added: 0.1
     lines_deleted: 0.05
+    use_meaningful_lines: true  # Exclude comments/whitespace from line scoring
     pr_opened: 25
     pr_merged: 50
     pr_reviewed: 30
@@ -386,6 +388,31 @@ options:
     - "*-ci"           # Suffix match
 ```
 
+### Meaningful Lines Filtering
+
+By default, Git Velocity filters out non-meaningful code changes when scoring line additions and deletions. This provides a more accurate measure of actual code contributions.
+
+**What's filtered out:**
+- **Comments**: Single-line (`//`, `#`, `--`), block (`/* */`, `<!-- -->`), docstrings (`"""`, `'''`)
+- **Whitespace**: Empty lines, whitespace-only lines
+- **Documentation files**: `.md`, `.rst`, `.txt`, `README`, `CHANGELOG`, `LICENSE`, files in `docs/` directories
+
+**Supported comment styles:**
+- C-style: `//`, `/* */`, `*` (block continuation)
+- Python/Shell: `#`, `"""`, `'''`
+- SQL/Lua/Haskell: `--`
+- Assembly/Lisp/INI: `;`
+- VB: `'`
+- HTML/XML: `<!-- -->`
+
+To disable this filtering and score raw line counts:
+
+```yaml
+scoring:
+  points:
+    use_meaningful_lines: false  # Score all lines including comments/whitespace
+```
+
 ### Environment Variables
 
 All configuration values support environment variable expansion:

config.example.yaml

@@ -89,6 +89,8 @@ scoring:
     commit_with_tests: 15
     lines_added: 0.1
     lines_deleted: 0.05
+    # Use meaningful lines (excludes comments/whitespace) for scoring
+    use_meaningful_lines: true
     pr_opened: 25
     pr_merged: 50
     pr_reviewed: 30

internal/aggregator/aggregator.go

@@ -137,6 +137,8 @@ func (a *Aggregator) Aggregate(data *models.RawData, dateRange *config.ParsedDat
 		cm.CommitCount++
 		cm.LinesAdded += commit.Additions
 		cm.LinesDeleted += commit.Deletions
+		cm.MeaningfulLinesAdded += commit.MeaningfulAdditions
+		cm.MeaningfulLinesDeleted += commit.MeaningfulDeletions
 		cm.FilesChanged += commit.FilesChanged
 
 		// Update per-repo contributor stats
@@ -144,6 +146,8 @@ func (a *Aggregator) Aggregate(data *models.RawData, dateRange *config.ParsedDat
 		rcm.CommitCount++
 		rcm.LinesAdded += commit.Additions
 		rcm.LinesDeleted += commit.Deletions
+		rcm.MeaningfulLinesAdded += commit.MeaningfulAdditions
+		rcm.MeaningfulLinesDeleted += commit.MeaningfulDeletions
 		rcm.FilesChanged += commit.FilesChanged
 
 		// Track activity patterns based on commit time
@@ -203,6 +207,8 @@ func (a *Aggregator) Aggregate(data *models.RawData, dateRange *config.ParsedDat
 		rm.TotalCommits++
 		rm.TotalLinesAdded += commit.Additions
 		rm.TotalLinesDeleted += commit.Deletions
+		rm.TotalMeaningfulLinesAdded += commit.MeaningfulAdditions
+		rm.TotalMeaningfulLinesDeleted += commit.MeaningfulDeletions
 	}
 
 	// Calculate active days and streaks for each contributor
@@ -535,28 +541,33 @@ func (a *Aggregator) Aggregate(data *models.RawData, dateRange *config.ParsedDat
 
 	// Calculate totals
 	var totalCommits, totalPRs, totalReviews, totalLinesAdded, totalLinesDeleted int
+	var totalMeaningfulLinesAdded, totalMeaningfulLinesDeleted int
 	for _, rm := range repositories {
 		totalCommits += rm.TotalCommits
 		totalPRs += rm.TotalPRs
 		totalReviews += rm.TotalReviews
 		totalLinesAdded += rm.TotalLinesAdded
 		totalLinesDeleted += rm.TotalLinesDeleted
+		totalMeaningfulLinesAdded += rm.TotalMeaningfulLinesAdded
+		totalMeaningfulLinesDeleted += rm.TotalMeaningfulLinesDeleted
 	}
 
 	// Build velocity timeline (weekly aggregation)
 	velocityTimeline := buildVelocityTimeline(data, period, a.config.Scoring)
 
 	return &models.GlobalMetrics{
-		Period:            period,
-		Repositories:      repositories,
-		Teams:             teams,
-		TotalContributors: len(contributors),
-		TotalCommits:      totalCommits,
-		TotalPRs:          totalPRs,
-		TotalReviews:      totalReviews,
-		TotalLinesAdded:   totalLinesAdded,
-		TotalLinesDeleted: totalLinesDeleted,
-		VelocityTimeline:  velocityTimeline,
+		Period:                      period,
+		Repositories:                repositories,
+		Teams:                       teams,
+		TotalContributors:           len(contributors),
+		TotalCommits:                totalCommits,
+		TotalPRs:                    totalPRs,
+		TotalReviews:                totalReviews,
+		TotalLinesAdded:             totalLinesAdded,
+		TotalLinesDeleted:           totalLinesDeleted,
+		TotalMeaningfulLinesAdded:   totalMeaningfulLinesAdded,
+		TotalMeaningfulLinesDeleted: totalMeaningfulLinesDeleted,
+		VelocityTimeline:            velocityTimeline,
 	}, nil
 }
 

internal/config/schema.go

@@ -88,6 +88,10 @@ type PointsConfig struct {
 	FastReview4h    int     `yaml:"fast_review_4h"`
 	FastReview24h   int     `yaml:"fast_review_24h"`
 	OutOfHours      int     `yaml:"out_of_hours"` // Bonus per commit outside 9am-5pm
+
+	// UseMeaningfulLines determines whether scoring uses meaningful lines (excluding comments/whitespace)
+	// or raw line counts. Default is true for more accurate contribution scoring.
+	UseMeaningfulLines bool `yaml:"use_meaningful_lines"`
 }
 
 // AchievementConfig defines an achievement badge
@@ -185,20 +189,21 @@ func DefaultConfig() *Config {
 		Scoring: ScoringConfig{
 			Enabled: true,
 			Points: PointsConfig{
-				Commit:          10,
-				CommitWithTests: 15,
-				LinesAdded:      0.1,
-				LinesDeleted:    0.05,
-				PROpened:        25,
-				PRMerged:        50,
-				PRReviewed:      30,
-				ReviewComment:   5,
-				IssueOpened:     15,
-				IssueClosed:     20,
-				FastReview1h:    50,
-				FastReview4h:    25,
-				FastReview24h:   10,
-				OutOfHours:      2,
+				Commit:             10,
+				CommitWithTests:    15,
+				LinesAdded:         0.1,
+				LinesDeleted:       0.05,
+				PROpened:           25,
+				PRMerged:           50,
+				PRReviewed:         30,
+				ReviewComment:      5,
+				IssueOpened:        15,
+				IssueClosed:        20,
+				FastReview1h:       50,
+				FastReview4h:       25,
+				FastReview24h:      10,
+				OutOfHours:         2,
+				UseMeaningfulLines: true, // Default to meaningful lines for accurate contribution scoring
 			},
 		},
 		Output: OutputConfig{

internal/diff/analyzer.go

@@ -0,0 +1,137 @@
+package diff
+
+import (
+	"strings"
+)
+
+// IsCommentLine checks if a line is a code comment (should not count as meaningful contribution)
+func IsCommentLine(line string) bool {
+	trimmed := strings.TrimSpace(line)
+	if trimmed == "" {
+		return true // Empty lines don't count
+	}
+
+	// Common comment patterns across languages
+	commentPrefixes := []string{
+		"//",     // C, C++, Java, Go, JS, TS, Swift, Kotlin, etc.
+		"#",      // Python, Ruby, Shell, YAML, Perl, etc.
+		"/*",     // C-style block comment start
+		"*/",     // C-style block comment end
+		"*",      // C-style block comment continuation
+		"<!--",   // HTML/XML comment
+		"-->",    // HTML/XML comment end
+		"--",     // SQL, Lua, Haskell
+		";",      // Assembly, Lisp, INI files
+		"'",      // VB comment
+		"\"\"\"", // Python docstring
+		"'''",    // Python docstring
+	}
+
+	for _, prefix := range commentPrefixes {
+		if strings.HasPrefix(trimmed, prefix) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// IsWhitespaceLine checks if a line contains only whitespace characters
+func IsWhitespaceLine(line string) bool {
+	return strings.TrimSpace(line) == ""
+}
+
+// IsDocumentationFile checks if a file is documentation-only
+func IsDocumentationFile(filename string) bool {
+	// Documentation file extensions and patterns
+	docPatterns := []string{
+		".md", ".markdown", ".rst", ".txt", ".adoc",
+		"README", "CHANGELOG", "LICENSE", "CONTRIBUTING",
+		"docs/", "documentation/", "/doc/",
+	}
+
+	lowerFilename := strings.ToLower(filename)
+	for _, pattern := range docPatterns {
+		if strings.Contains(lowerFilename, strings.ToLower(pattern)) {
+			return true
+		}
+	}
+	return false
+}
+
+// PatchStats holds the results of analyzing a diff patch
+type PatchStats struct {
+	TotalAdditions      int
+	TotalDeletions      int
+	MeaningfulAdditions int
+	MeaningfulDeletions int
+	CommentAdditions    int
+	CommentDeletions    int
+	WhitespaceAdditions int
+	WhitespaceDeletions int
+}
+
+// AnalyzePatch analyzes a unified diff patch and returns both raw and meaningful line counts.
+// It parses diff hunks and categorizes each changed line as meaningful, comment, or whitespace.
+func AnalyzePatch(patch string) PatchStats {
+	stats := PatchStats{}
+
+	lines := strings.Split(patch, "\n")
+	for _, line := range lines {
+		if len(line) == 0 {
+			continue
+		}
+
+		// Check if this is an addition or deletion line
+		isAddition := strings.HasPrefix(line, "+") && !strings.HasPrefix(line, "+++")
+		isDeletion := strings.HasPrefix(line, "-") && !strings.HasPrefix(line, "---")
+
+		if !isAddition && !isDeletion {
+			continue // Context line or header
+		}
+
+		// Remove the diff prefix to get actual content
+		content := line[1:]
+
+		// Categorize the line
+		if IsWhitespaceLine(content) {
+			if isAddition {
+				stats.TotalAdditions++
+				stats.WhitespaceAdditions++
+			} else {
+				stats.TotalDeletions++
+				stats.WhitespaceDeletions++
+			}
+		} else if IsCommentLine(content) {
+			if isAddition {
+				stats.TotalAdditions++
+				stats.CommentAdditions++
+			} else {
+				stats.TotalDeletions++
+				stats.CommentDeletions++
+			}
+		} else {
+			// Meaningful code line
+			if isAddition {
+				stats.TotalAdditions++
+				stats.MeaningfulAdditions++
+			} else {
+				stats.TotalDeletions++
+				stats.MeaningfulDeletions++
+			}
+		}
+	}
+
+	return stats
+}
+
+// AnalyzePatchSimple returns just the meaningful additions and deletions
+func AnalyzePatchSimple(patch string) (meaningfulAdds, meaningfulDels int) {
+	stats := AnalyzePatch(patch)
+	return stats.MeaningfulAdditions, stats.MeaningfulDeletions
+}
+
+// IsMeaningfulLine checks if a line of code is meaningful (not a comment or whitespace)
+func IsMeaningfulLine(line string) bool {
+	return !IsWhitespaceLine(line) && !IsCommentLine(line)
+}

internal/diff/analyzer_test.go

@@ -0,0 +1,431 @@
+package diff
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsCommentLine(t *testing.T) {
+	tests := []struct {
+		name     string
+		line     string
+		expected bool
+	}{
+		// Empty and whitespace
+		{"empty string", "", true},
+		{"whitespace only", "   ", true},
+		{"tab only", "\t", true},
+		{"mixed whitespace", "  \t  ", true},
+
+		// C-style comments (Go, Java, JS, C++, etc.)
+		{"C single line comment", "// this is a comment", true},
+		{"C single line with leading space", "  // this is a comment", true},
+		{"C block start", "/* block comment", true},
+		{"C block end", "*/", true},
+		{"C block continuation", "* continuation", true},
+		{"C block continuation with space", "  * continuation", true},
+
+		// Python/Shell comments
+		{"Python comment", "# python comment", true},
+		{"Shell comment", "#!/bin/bash", true},
+		{"Python comment with space", "  # comment", true},
+
+		// Python docstrings
+		{"Python docstring double", "\"\"\"docstring", true},
+		{"Python docstring single", "'''docstring", true},
+
+		// SQL/Lua/Haskell comments
+		{"SQL comment", "-- SQL comment", true},
+
+		// Assembly/Lisp/INI comments
+		{"Assembly comment", "; assembly comment", true},
+		{"INI comment", "; ini comment", true},
+
+		// VB comments
+		{"VB comment", "' VB comment", true},
+
+		// HTML/XML comments
+		{"HTML comment start", "<!-- html comment", true},
+		{"HTML comment end", "-->", true},
+
+		// Actual code - NOT comments
+		{"Go code", "func main() {", false},
+		{"Python code", "def main():", false},
+		{"JS code", "const x = 5;", false},
+		{"Variable assignment", "x = 10", false},
+		{"Return statement", "return nil", false},
+		{"Import statement", "import fmt", false},
+		{"Package declaration", "package main", false},
+		{"Struct field", "Name string", false},
+		{"Function call", "fmt.Println(x)", false},
+		{"String with slash", `"http://example.com"`, false},
+		{"Code after whitespace", "    x := 5", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := IsCommentLine(tt.line)
+			assert.Equal(t, tt.expected, result, "IsCommentLine(%q)", tt.line)
+		})
+	}
+}
+
+func TestIsWhitespaceLine(t *testing.T) {
+	tests := []struct {
+		name     string
+		line     string
+		expected bool
+	}{
+		{"empty string", "", true},
+		{"single space", " ", true},
+		{"multiple spaces", "     ", true},
+		{"single tab", "\t", true},
+		{"multiple tabs", "\t\t\t", true},
+		{"mixed whitespace", "  \t  \t  ", true},
+		{"newline only", "\n", true},
+		{"carriage return", "\r", true},
+		{"code line", "x := 5", false},
+		{"code with leading whitespace", "    x := 5", false},
+		{"comment line", "// comment", false},
+		{"single character", "x", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := IsWhitespaceLine(tt.line)
+			assert.Equal(t, tt.expected, result, "IsWhitespaceLine(%q)", tt.line)
+		})
+	}
+}
+
+func TestIsDocumentationFile(t *testing.T) {
+	tests := []struct {
+		name     string
+		filename string
+		expected bool
+	}{
+		// Documentation files
+		{"readme markdown", "README.md", true},
+		{"readme uppercase", "README", true},
+		{"readme lowercase", "readme.md", true},
+		{"changelog", "CHANGELOG.md", true},
+		{"license", "LICENSE", true},
+		{"license txt", "LICENSE.txt", true},
+		{"contributing", "CONTRIBUTING.md", true},
+		{"markdown file", "docs.md", true},
+		{"rst file", "index.rst", true},
+		{"txt file", "notes.txt", true},
+		{"adoc file", "guide.adoc", true},
+		{"docs directory", "docs/api.md", true},
+		{"documentation directory", "documentation/guide.md", true},
+		{"doc directory", "/doc/api.md", true},
+
+		// Code files - NOT documentation
+		{"go file", "main.go", false},
+		{"python file", "app.py", false},
+		{"js file", "index.js", false},
+		{"ts file", "app.ts", false},
+		{"java file", "App.java", false},
+		{"c file", "main.c", false},
+		{"cpp file", "main.cpp", false},
+		{"rust file", "main.rs", false},
+		{"yaml file", "config.yaml", false},
+		{"json file", "package.json", false},
+		{"html file", "index.html", false},
+		{"css file", "style.css", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := IsDocumentationFile(tt.filename)
+			assert.Equal(t, tt.expected, result, "IsDocumentationFile(%q)", tt.filename)
+		})
+	}
+}
+
+func TestAnalyzePatch(t *testing.T) {
+	tests := []struct {
+		name     string
+		patch    string
+		expected PatchStats
+	}{
+		{
+			name: "simple additions",
+			patch: `@@ -1,3 +1,5 @@
+ context line
++func main() {
++    x := 5
++}`,
+			expected: PatchStats{
+				TotalAdditions:      3,
+				MeaningfulAdditions: 3,
+			},
+		},
+		{
+			name: "simple deletions",
+			patch: `@@ -1,5 +1,3 @@
+ context line
+-func main() {
+-    x := 5
+-}`,
+			expected: PatchStats{
+				TotalDeletions:      3,
+				MeaningfulDeletions: 3,
+			},
+		},
+		{
+			name: "mixed additions and deletions",
+			patch: `@@ -1,3 +1,3 @@
+-old code
++new code`,
+			expected: PatchStats{
+				TotalAdditions:      1,
+				TotalDeletions:      1,
+				MeaningfulAdditions: 1,
+				MeaningfulDeletions: 1,
+			},
+		},
+		{
+			name: "comment only changes",
+			patch: `@@ -1,3 +1,5 @@
+ func main() {
++// This is a comment
++// Another comment
+ }`,
+			expected: PatchStats{
+				TotalAdditions:   2,
+				CommentAdditions: 2,
+			},
+		},
+		{
+			name: "whitespace only changes",
+			patch: `@@ -1,3 +1,5 @@
+ func main() {
++
++
+ }`,
+			expected: PatchStats{
+				TotalAdditions:      2,
+				WhitespaceAdditions: 2,
+			},
+		},
+		{
+			name: "mixed meaningful and non-meaningful",
+			patch: `@@ -1,5 +1,10 @@
+ func main() {
++// Add logging
++    x := 5
++
++    // Calculate result
++    result := x * 2
++
+ }`,
+			expected: PatchStats{
+				TotalAdditions:      6,
+				MeaningfulAdditions: 2, // x := 5 and result := x * 2
+				CommentAdditions:    2, // two comments
+				WhitespaceAdditions: 2, // two empty lines
+			},
+		},
+		{
+			name: "deleted comments",
+			patch: `@@ -1,5 +1,2 @@
+ func main() {
+-// Old comment
+-/* Block comment */
+ }`,
+			expected: PatchStats{
+				TotalDeletions:   2,
+				CommentDeletions: 2,
+			},
+		},
+		{
+			name: "python style comments",
+			patch: `@@ -1,3 +1,6 @@
+ def main():
++# This is a python comment
++"""This is a docstring"""
++    x = 5`,
+			expected: PatchStats{
+				TotalAdditions:      3,
+				MeaningfulAdditions: 1, // x = 5
+				CommentAdditions:    2, // # comment and docstring
+			},
+		},
+		{
+			name: "sql comments",
+			patch: `@@ -1,2 +1,4 @@
+ SELECT * FROM users
++-- This is a SQL comment
++WHERE id = 1`,
+			expected: PatchStats{
+				TotalAdditions:      2,
+				MeaningfulAdditions: 1, // WHERE clause
+				CommentAdditions:    1, // SQL comment
+			},
+		},
+		{
+			name:  "empty patch",
+			patch: "",
+			expected: PatchStats{
+				TotalAdditions:      0,
+				TotalDeletions:      0,
+				MeaningfulAdditions: 0,
+				MeaningfulDeletions: 0,
+			},
+		},
+		{
+			name: "context only patch",
+			patch: `@@ -1,3 +1,3 @@
+ line 1
+ line 2
+ line 3`,
+			expected: PatchStats{
+				TotalAdditions:      0,
+				TotalDeletions:      0,
+				MeaningfulAdditions: 0,
+				MeaningfulDeletions: 0,
+			},
+		},
+		{
+			name: "header lines should be ignored",
+			patch: `--- a/file.go
++++ b/file.go
+@@ -1,3 +1,4 @@
+ context
++new line`,
+			expected: PatchStats{
+				TotalAdditions:      1,
+				MeaningfulAdditions: 1,
+			},
+		},
+		{
+			name: "c-style block comment continuation",
+			patch: `@@ -1,2 +1,5 @@
+ code
++/*
++ * Block comment
++ */`,
+			expected: PatchStats{
+				TotalAdditions:   3,
+				CommentAdditions: 3,
+			},
+		},
+		{
+			name: "html comments",
+			patch: `@@ -1,2 +1,4 @@
+ <div>
++<!-- This is an HTML comment -->
++<p>Content</p>`,
+			expected: PatchStats{
+				TotalAdditions:      2,
+				MeaningfulAdditions: 1, // <p> tag
+				CommentAdditions:    1, // HTML comment
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := AnalyzePatch(tt.patch)
+			assert.Equal(t, tt.expected.TotalAdditions, result.TotalAdditions, "TotalAdditions")
+			assert.Equal(t, tt.expected.TotalDeletions, result.TotalDeletions, "TotalDeletions")
+			assert.Equal(t, tt.expected.MeaningfulAdditions, result.MeaningfulAdditions, "MeaningfulAdditions")
+			assert.Equal(t, tt.expected.MeaningfulDeletions, result.MeaningfulDeletions, "MeaningfulDeletions")
+			assert.Equal(t, tt.expected.CommentAdditions, result.CommentAdditions, "CommentAdditions")
+			assert.Equal(t, tt.expected.CommentDeletions, result.CommentDeletions, "CommentDeletions")
+			assert.Equal(t, tt.expected.WhitespaceAdditions, result.WhitespaceAdditions, "WhitespaceAdditions")
+			assert.Equal(t, tt.expected.WhitespaceDeletions, result.WhitespaceDeletions, "WhitespaceDeletions")
+		})
+	}
+}
+
+func TestAnalyzePatchSimple(t *testing.T) {
+	patch := `@@ -1,3 +1,6 @@
+ func main() {
++// comment
++    x := 5
++
++    y := 10
+ }`
+
+	adds, dels := AnalyzePatchSimple(patch)
+	assert.Equal(t, 2, adds, "meaningful additions (x := 5 and y := 10)")
+	assert.Equal(t, 0, dels, "meaningful deletions")
+}
+
+func TestIsMeaningfulLine(t *testing.T) {
+	tests := []struct {
+		name     string
+		line     string
+		expected bool
+	}{
+		{"code line", "x := 5", true},
+		{"function definition", "func main() {", true},
+		{"return statement", "return nil", true},
+		{"comment line", "// comment", false},
+		{"empty line", "", false},
+		{"whitespace line", "   ", false},
+		{"python comment", "# comment", false},
+		{"code with leading whitespace", "    x := 5", true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := IsMeaningfulLine(tt.line)
+			assert.Equal(t, tt.expected, result, "IsMeaningfulLine(%q)", tt.line)
+		})
+	}
+}
+
+func TestAnalyzePatch_RealWorldExample(t *testing.T) {
+	// Simulate a real-world Go file change
+	patch := `diff --git a/main.go b/main.go
+index 1234567..abcdefg 100644
+--- a/main.go
++++ b/main.go
+@@ -10,6 +10,15 @@ package main
+ import "fmt"
+
++// ProcessData handles data processing
++// It takes input and returns processed output
+ func ProcessData(input string) string {
++	// Validate input
++	if input == "" {
++		return ""
++	}
++
++	// Transform the data
++	result := strings.ToUpper(input)
+-	return input
++	return result
+ }`
+
+	stats := AnalyzePatch(patch)
+
+	// Count what's actually in the patch:
+	// Additions (lines starting with +, not +++):
+	// 1. +// ProcessData handles data processing  -> comment
+	// 2. +// It takes input and returns processed output  -> comment
+	// 3. +	// Validate input  -> comment
+	// 4. +	if input == ""  -> meaningful
+	// 5. +		return ""  -> meaningful
+	// 6. +	}  -> meaningful
+	// 7. +  (empty line)  -> whitespace
+	// 8. +	// Transform the data  -> comment
+	// 9. +	result := strings.ToUpper(input)  -> meaningful
+	// 10. +	return result  -> meaningful
+	// Total: 10 additions, 5 meaningful, 4 comments, 1 whitespace
+
+	// Deletions (lines starting with -, not ---):
+	// 1. -	return input  -> meaningful
+	// Total: 1 deletion, 1 meaningful
+
+	assert.Equal(t, 10, stats.TotalAdditions, "Total additions")
+	assert.Equal(t, 1, stats.TotalDeletions, "Total deletions")
+	assert.Equal(t, 5, stats.MeaningfulAdditions, "Meaningful additions")
+	assert.Equal(t, 1, stats.MeaningfulDeletions, "Meaningful deletions")
+	assert.Equal(t, 4, stats.CommentAdditions, "Comment additions")
+	assert.Equal(t, 1, stats.WhitespaceAdditions, "Whitespace additions")
+}

internal/domain/models/commit.go

@@ -15,6 +15,10 @@ type Commit struct {
 	Repository   string    `json:"repository"` // owner/repo format
 	URL          string    `json:"url"`
 
+	// Meaningful line counts (excludes comments and whitespace)
+	MeaningfulAdditions int `json:"meaningful_additions"`
+	MeaningfulDeletions int `json:"meaningful_deletions"`
+
 	// Derived fields
 	HasTests bool `json:"has_tests"`
 }

internal/domain/models/metrics.go

@@ -23,6 +23,10 @@ type ContributorMetrics struct {
 	LinesDeleted int `json:"lines_deleted"`
 	FilesChanged int `json:"files_changed"`
 
+	// Meaningful line counts (excludes comments and whitespace)
+	MeaningfulLinesAdded   int `json:"meaningful_lines_added"`
+	MeaningfulLinesDeleted int `json:"meaningful_lines_deleted"`
+
 	// PR metrics
 	PRsOpened      int     `json:"prs_opened"`
 	PRsMerged      int     `json:"prs_merged"`
@@ -97,6 +101,10 @@ type RepositoryMetrics struct {
 	ActiveContributors int                  `json:"active_contributors"`
 	TotalLinesAdded    int                  `json:"total_lines_added"`
 	TotalLinesDeleted  int                  `json:"total_lines_deleted"`
+
+	// Meaningful line counts (excludes comments and whitespace)
+	TotalMeaningfulLinesAdded   int `json:"total_meaningful_lines_added"`
+	TotalMeaningfulLinesDeleted int `json:"total_meaningful_lines_deleted"`
 }
 
 // TeamMetrics holds aggregated metrics for a team
@@ -127,6 +135,10 @@ type GlobalMetrics struct {
 	TotalLinesAdded   int `json:"total_lines_added"`
 	TotalLinesDeleted int `json:"total_lines_deleted"`
 
+	// Meaningful line counts (excludes comments and whitespace)
+	TotalMeaningfulLinesAdded   int `json:"total_meaningful_lines_added"`
+	TotalMeaningfulLinesDeleted int `json:"total_meaningful_lines_deleted"`
+
 	// Velocity timeline (weekly granularity)
 	VelocityTimeline *VelocityTimeline `json:"velocity_timeline,omitempty"`
 }

internal/domain/models/pullrequest.go

@@ -32,6 +32,10 @@ type PullRequest struct {
 	Reviews      []Review   `json:"reviews,omitempty"`
 	URL          string     `json:"url"`
 
+	// Meaningful line counts (excludes comments and whitespace)
+	MeaningfulAdditions int `json:"meaningful_additions"`
+	MeaningfulDeletions int `json:"meaningful_deletions"`
+
 	// Derived fields
 	TimeToMerge       *time.Duration `json:"time_to_merge,omitempty"`
 	TimeToFirstReview *time.Duration `json:"time_to_first_review,omitempty"`

internal/domain/scoring/calculator.go

@@ -40,6 +40,8 @@ func (c *Calculator) Calculate(metrics *models.GlobalMetrics) *models.GlobalMetr
 				existing.CommitCount += cm.CommitCount
 				existing.LinesAdded += cm.LinesAdded
 				existing.LinesDeleted += cm.LinesDeleted
+				existing.MeaningfulLinesAdded += cm.MeaningfulLinesAdded
+				existing.MeaningfulLinesDeleted += cm.MeaningfulLinesDeleted
 				existing.PRsOpened += cm.PRsOpened
 				existing.PRsMerged += cm.PRsMerged
 				existing.ReviewsGiven += cm.ReviewsGiven
@@ -157,9 +159,15 @@ func (c *Calculator) calculateScore(cm *models.ContributorMetrics) models.Score
 	// Commit points
 	breakdown.Commits = cm.CommitCount * points.Commit
 
-	// Line change points
-	breakdown.LineChanges = int(float64(cm.LinesAdded)*points.LinesAdded +
-		float64(cm.LinesDeleted)*points.LinesDeleted)
+	// Line change points - use meaningful lines if configured, otherwise raw counts
+	linesAdded := cm.LinesAdded
+	linesDeleted := cm.LinesDeleted
+	if points.UseMeaningfulLines {
+		linesAdded = cm.MeaningfulLinesAdded
+		linesDeleted = cm.MeaningfulLinesDeleted
+	}
+	breakdown.LineChanges = int(float64(linesAdded)*points.LinesAdded +
+		float64(linesDeleted)*points.LinesDeleted)
 
 	// PR points
 	breakdown.PRs = cm.PRsOpened*points.PROpened + cm.PRsMerged*points.PRMerged

internal/domain/scoring/calculator_test.go

@@ -748,3 +748,133 @@ func TestContains(t *testing.T) {
 	assert.False(t, contains(slice, "d"))
 	assert.False(t, contains([]string{}, "a"))
 }
+
+func TestCalculator_MeaningfulLinesScoring(t *testing.T) {
+	t.Parallel()
+
+	t.Run("uses meaningful lines when enabled", func(t *testing.T) {
+		t.Parallel()
+
+		cfg := config.DefaultConfig()
+		cfg.Scoring.Enabled = true
+		cfg.Scoring.Points = config.PointsConfig{
+			Commit:             10,
+			LinesAdded:         0.1,
+			LinesDeleted:       0.05,
+			UseMeaningfulLines: true, // Use meaningful lines
+		}
+		calc := NewCalculator(cfg)
+
+		metrics := &models.GlobalMetrics{
+			Repositories: []models.RepositoryMetrics{
+				{
+					FullName: "owner/repo",
+					Contributors: []models.ContributorMetrics{
+						{
+							Login:                   "user1",
+							CommitCount:             10,
+							LinesAdded:              1000, // Raw lines
+							LinesDeleted:            500,
+							MeaningfulLinesAdded:    800, // Meaningful lines (excluding comments/whitespace)
+							MeaningfulLinesDeleted:  400,
+							RepositoriesContributed: []string{"owner/repo"},
+						},
+					},
+				},
+			},
+		}
+
+		result := calc.Calculate(metrics)
+
+		contributor := result.Repositories[0].Contributors[0]
+		// Line change points should use meaningful lines:
+		// Meaningful: 800 * 0.1 + 400 * 0.05 = 80 + 20 = 100
+		// (Not raw: 1000 * 0.1 + 500 * 0.05 = 100 + 25 = 125)
+		assert.Equal(t, 100, contributor.Score.Breakdown.LineChanges)
+		// Total: Commits (10 * 10 = 100) + Lines (100) = 200
+		assert.Equal(t, 200, contributor.Score.Total)
+	})
+
+	t.Run("uses raw lines when disabled", func(t *testing.T) {
+		t.Parallel()
+
+		cfg := config.DefaultConfig()
+		cfg.Scoring.Enabled = true
+		cfg.Scoring.Points = config.PointsConfig{
+			Commit:             10,
+			LinesAdded:         0.1,
+			LinesDeleted:       0.05,
+			UseMeaningfulLines: false, // Use raw lines
+		}
+		calc := NewCalculator(cfg)
+
+		metrics := &models.GlobalMetrics{
+			Repositories: []models.RepositoryMetrics{
+				{
+					FullName: "owner/repo",
+					Contributors: []models.ContributorMetrics{
+						{
+							Login:                   "user1",
+							CommitCount:             10,
+							LinesAdded:              1000, // Raw lines
+							LinesDeleted:            500,
+							MeaningfulLinesAdded:    800, // Meaningful lines (should be ignored)
+							MeaningfulLinesDeleted:  400,
+							RepositoriesContributed: []string{"owner/repo"},
+						},
+					},
+				},
+			},
+		}
+
+		result := calc.Calculate(metrics)
+
+		contributor := result.Repositories[0].Contributors[0]
+		// Line change points should use raw lines:
+		// Raw: 1000 * 0.1 + 500 * 0.05 = 100 + 25 = 125
+		assert.Equal(t, 125, contributor.Score.Breakdown.LineChanges)
+		// Total: Commits (10 * 10 = 100) + Lines (125) = 225
+		assert.Equal(t, 225, contributor.Score.Total)
+	})
+
+	t.Run("comment-only changes score zero meaningful lines", func(t *testing.T) {
+		t.Parallel()
+
+		cfg := config.DefaultConfig()
+		cfg.Scoring.Enabled = true
+		cfg.Scoring.Points = config.PointsConfig{
+			Commit:             10,
+			LinesAdded:         0.1,
+			LinesDeleted:       0.05,
+			UseMeaningfulLines: true,
+		}
+		calc := NewCalculator(cfg)
+
+		metrics := &models.GlobalMetrics{
+			Repositories: []models.RepositoryMetrics{
+				{
+					FullName: "owner/repo",
+					Contributors: []models.ContributorMetrics{
+						{
+							Login:                   "commenter",
+							CommitCount:             5,
+							LinesAdded:              100, // All comment lines
+							LinesDeleted:            50,
+							MeaningfulLinesAdded:    0, // No meaningful code
+							MeaningfulLinesDeleted:  0,
+							RepositoriesContributed: []string{"owner/repo"},
+						},
+					},
+				},
+			},
+		}
+
+		result := calc.Calculate(metrics)
+
+		contributor := result.Repositories[0].Contributors[0]
+		// Line change points should be 0 since all lines were comments
+		assert.Equal(t, 0, contributor.Score.Breakdown.LineChanges)
+		// Total: Commits (5 * 10 = 50) + Lines (0) = 50
+		assert.Equal(t, 50, contributor.Score.Total)
+	})
+}

internal/git/repository.go

@@ -14,6 +14,7 @@ import (
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
 	"github.com/go-git/go-git/v5/plumbing/transport/http"
+	"github.com/lukaszraczylo/git-velocity/internal/diff"
 	"github.com/lukaszraczylo/git-velocity/internal/domain/models"
 )
 
@@ -128,56 +129,6 @@ func (r *Repository) fetch(ctx context.Context, repoPath, token string) error {
 	return nil
 }
 
-// isCommentLine checks if a line is a code comment (should not count as contribution)
-func isCommentLine(line string) bool {
-	trimmed := strings.TrimSpace(line)
-	if trimmed == "" {
-		return true // Empty lines don't count
-	}
-
-	// Common comment patterns across languages
-	commentPrefixes := []string{
-		"//",     // C, C++, Java, Go, JS, etc.
-		"#",      // Python, Ruby, Shell, YAML
-		"/*",     // C-style block comment start
-		"*/",     // C-style block comment end
-		"*",      // C-style block comment continuation
-		"<!--",   // HTML/XML comment
-		"-->",    // HTML/XML comment end
-		"--",     // SQL, Lua, Haskell
-		";",      // Assembly, Lisp, INI files
-		"'",      // VB comment
-		"\"\"\"", // Python docstring
-		"'''",    // Python docstring
-	}
-
-	for _, prefix := range commentPrefixes {
-		if strings.HasPrefix(trimmed, prefix) {
-			return true
-		}
-	}
-
-	return false
-}
-
-// isDocumentationFile checks if a file is documentation-only
-func isDocumentationFile(filename string) bool {
-	// Documentation file extensions and patterns
-	docPatterns := []string{
-		".md", ".markdown", ".rst", ".txt", ".adoc",
-		"README", "CHANGELOG", "LICENSE", "CONTRIBUTING",
-		"docs/", "documentation/", "/doc/",
-	}
-
-	lowerFilename := strings.ToLower(filename)
-	for _, pattern := range docPatterns {
-		if strings.Contains(lowerFilename, strings.ToLower(pattern)) {
-			return true
-		}
-	}
-	return false
-}
-
 // FetchCommits retrieves commits from the local repository using go-git
 func (r *Repository) FetchCommits(ctx context.Context, owner, name string, since, until *time.Time) ([]models.Commit, error) {
 	repoPath := r.repoPath(owner, name)
@@ -242,7 +193,7 @@ func (r *Repository) FetchCommits(ctx context.Context, owner, name string, since
 			}
 
 			// Get file stats for this commit
-			additions, deletions, filesChanged, hasTests := r.getCommitStats(c, testPatterns)
+			stats := r.getCommitStats(c, testPatterns)
 
 			// Extract login from email
 			authorLogin := extractLoginFromEmail(c.Author.Email, c.Author.Name)
@@ -261,13 +212,15 @@ func (r *Repository) FetchCommits(ctx context.Context, owner, name string, since
 					Name:  c.Committer.Name,
 					Email: c.Committer.Email,
 				},
-				Date:         commitTime,
-				Additions:    additions,
-				Deletions:    deletions,
-				FilesChanged: filesChanged,
-				Repository:   fmt.Sprintf("%s/%s", owner, name),
-				URL:          fmt.Sprintf("https://github.com/%s/%s/commit/%s", owner, name, c.Hash.String()),
-				HasTests:     hasTests,
+				Date:                commitTime,
+				Additions:           stats.Additions,
+				Deletions:           stats.Deletions,
+				MeaningfulAdditions: stats.MeaningfulAdditions,
+				MeaningfulDeletions: stats.MeaningfulDeletions,
+				FilesChanged:        stats.FilesChanged,
+				Repository:          fmt.Sprintf("%s/%s", owner, name),
+				URL:                 fmt.Sprintf("https://github.com/%s/%s/commit/%s", owner, name, c.Hash.String()),
+				HasTests:            stats.HasTests,
 			}
 
 			commits = append(commits, commit)
@@ -286,8 +239,20 @@ func (r *Repository) FetchCommits(ctx context.Context, owner, name string, since
 	return commits, nil
 }
 
+// commitStats holds the statistics for a commit
+type commitStats struct {
+	Additions           int
+	Deletions           int
+	MeaningfulAdditions int
+	MeaningfulDeletions int
+	FilesChanged        int
+	HasTests            bool
+}
+
 // getCommitStats calculates additions, deletions, files changed for a commit
-func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) (additions, deletions, filesChanged int, hasTests bool) {
+func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) commitStats {
+	stats := commitStats{}
+
 	// Get parent commit for diff
 	parentIter := c.Parents()
 	parent, err := parentIter.Next()
@@ -299,7 +264,7 @@ func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) (ad
 
 	currentTree, err := c.Tree()
 	if err != nil {
-		return 0, 0, 0, false
+		return stats
 	}
 
 	// Get changes between parent and current
@@ -312,7 +277,7 @@ func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) (ad
 	}
 
 	if err != nil {
-		return 0, 0, 0, false
+		return stats
 	}
 
 	filesSet := make(map[string]bool)
@@ -327,19 +292,19 @@ func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) (ad
 		}
 
 		// Skip documentation files
-		if isDocumentationFile(filePath) {
+		if diff.IsDocumentationFile(filePath) {
 			continue
 		}
 
 		// Count unique files
 		if !filesSet[filePath] {
 			filesSet[filePath] = true
-			filesChanged++
+			stats.FilesChanged++
 
 			// Check for test files
 			for _, pattern := range testPatterns {
 				if strings.Contains(filePath, pattern) {
-					hasTests = true
+					stats.HasTests = true
 					break
 				}
 			}
@@ -359,14 +324,16 @@ func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) (ad
 				switch chunk.Type() {
 				case 1: // Add
 					for _, line := range lines {
-						if !isCommentLine(line) {
-							additions++
+						stats.Additions++
+						if diff.IsMeaningfulLine(line) {
+							stats.MeaningfulAdditions++
 						}
 					}
 				case 2: // Delete
 					for _, line := range lines {
-						if !isCommentLine(line) {
-							deletions++
+						stats.Deletions++
+						if diff.IsMeaningfulLine(line) {
+							stats.MeaningfulDeletions++
 						}
 					}
 				}
@@ -374,7 +341,7 @@ func (r *Repository) getCommitStats(c *object.Commit, testPatterns []string) (ad
 		}
 	}
 
-	return additions, deletions, filesChanged, hasTests
+	return stats
 }
 
 // extractLoginFromEmail tries to extract GitHub login from email

internal/github/client.go

@@ -13,6 +13,7 @@ import (
 	"github.com/google/go-github/v68/github"
 
 	"github.com/lukaszraczylo/git-velocity/internal/config"
+	"github.com/lukaszraczylo/git-velocity/internal/diff"
 	"github.com/lukaszraczylo/git-velocity/internal/domain/models"
 	"github.com/lukaszraczylo/git-velocity/internal/github/cache"
 )
@@ -726,10 +727,14 @@ func convertCommit(c *github.RepositoryCommit, owner, repo string) models.Commit
 	}
 	filesChanged = len(c.Files)
 
-	// Detect if commit includes tests
+	// Detect if commit includes tests and calculate meaningful line counts
 	hasTests := false
+	var meaningfulAdditions, meaningfulDeletions int
+
 	for _, f := range c.Files {
 		filename := f.GetFilename()
+
+		// Check for test files
 		if strings.Contains(filename, "_test.go") ||
 			strings.Contains(filename, ".test.") ||
 			strings.Contains(filename, ".spec.") ||
@@ -737,7 +742,19 @@ func convertCommit(c *github.RepositoryCommit, owner, repo string) models.Commit
 			strings.Contains(filename, "/test/") ||
 			strings.Contains(filename, "__tests__") {
 			hasTests = true
-			break
+		}
+
+		// Skip documentation files for meaningful line calculation
+		if diff.IsDocumentationFile(filename) {
+			continue
+		}
+
+		// Analyze file patch to get meaningful line counts
+		patch := f.GetPatch()
+		if patch != "" {
+			stats := diff.AnalyzePatch(patch)
+			meaningfulAdditions += stats.MeaningfulAdditions
+			meaningfulDeletions += stats.MeaningfulDeletions
 		}
 	}
 
@@ -747,17 +764,19 @@ func convertCommit(c *github.RepositoryCommit, owner, repo string) models.Commit
 	}
 
 	return models.Commit{
-		SHA:          c.GetSHA(),
-		Message:      message,
-		Author:       author,
-		Committer:    committer,
-		Date:         date,
-		Additions:    additions,
-		Deletions:    deletions,
-		FilesChanged: filesChanged,
-		Repository:   fmt.Sprintf("%s/%s", owner, repo),
-		URL:          c.GetHTMLURL(),
-		HasTests:     hasTests,
+		SHA:                 c.GetSHA(),
+		Message:             message,
+		Author:              author,
+		Committer:           committer,
+		Date:                date,
+		Additions:           additions,
+		Deletions:           deletions,
+		MeaningfulAdditions: meaningfulAdditions,
+		MeaningfulDeletions: meaningfulDeletions,
+		FilesChanged:        filesChanged,
+		Repository:          fmt.Sprintf("%s/%s", owner, repo),
+		URL:                 c.GetHTMLURL(),
+		HasTests:            hasTests,
 	}
 }