cleanup

5 files changed, 1 insertions, 565 deletions

diff --git a/.gitignore b/.gitignore
index 8b13789..7c24463 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1 @@
-
+/gt
diff --git a/FIXES.md b/FIXES.md
deleted file mode 100644
index d6cc694..0000000
--- a/FIXES.md
+++ /dev/null
@@ -1,378 +0,0 @@
-# Proposed Fixes for 100 Go Mistakes Audit
-
-This document outlines specific code changes to address the HIGH and MEDIUM severity issues identified in the audit.
-
----
-
-## Fix #1: Proper Error Wrapping in RPN Package
-
-**File:** `internal/rpn/rpn.go`  
-**Issue:** Errors not wrapped with context  
-**Location:** Multiple functions including `ParseAndEvaluate`, `evaluate`
-
-### Current Code:
-```go
-func (r *RPN) ParseAndEvaluate(input string) (string, error) {
-    // ...
-    if len(tokens) == 0 {
-        return "", fmt.Errorf("no valid tokens found")
-    }
-    return r.evaluate(tokens)
-}
-
-func (r *RPN) evaluate(tokens []string) (string, error) {
-    // ...
-    if result, err := r.handleOperator(stack, token, i); err != nil {
-        return "", err  // Missing context
-    }
-    // ...
-}
-```
-
-### Fixed Code:
-```go
-func (r *RPN) ParseAndEvaluate(input string) (string, error) {
-    // ...
-    if len(tokens) == 0 {
-        return "", fmt.Errorf("rpn: no valid tokens found in input: %q", input)
-    }
-    return r.evaluate(tokens)
-}
-
-func (r *RPN) evaluate(tokens []string) (string, error) {
-    // ...
-    if result, err := r.handleOperator(stack, token, i); err != nil {
-        return "", fmt.Errorf("rpn: failed to evaluate token '%s' at position %d: %w", token, i, err)
-    }
-    // ...
-}
-```
-
----
-
-## Fix #2: Proper Error Comparison in Tests
-
-**File:** `internal/rpn/variables_test.go`  
-**Issue:** Direct error comparison instead of `errors.Is()`  
-**Location:** `TestOperationsUseVariableUndefined`
-
-### Current Code:
-```go
-func TestOperationsUseVariableUndefined(t *testing.T) {
-    // ...
-    err := o.UseVariable(s, "undefined")
-    if err == nil {
-        t.Error("UseVariable for undefined variable should return error")
-    }
-    if !errors.Is(err, ErrVariableNotFound) {  // This is actually correct, but some places use direct comparison
-        t.Errorf("UseVariable error = %v, should be ErrVariableNotFound", err)
-    }
-}
-```
-
-### Note:
-The code already uses `errors.Is()`, which is correct. No change needed here.
-
----
-
-## Fix #3: Proper Resource Cleanup in REPL
-
-**File:** `internal/repl/repl.go`  
-**Issue:** Defer error ignoring in `saveHistory`  
-**Location:** Lines ~160-180
-
-### Current Code:
-```go
-func saveHistory(history []string) error {
-    historyPath := getHistoryPath()
-    if historyPath == "" {
-        return nil
-    }
-
-    file, err := os.Create(historyPath)
-    if err != nil {
-        return err
-    }
-
-    writer := bufio.NewWriter(file)
-    for _, entry := range history {
-        if _, err := writer.WriteString(entry + "\n"); err != nil {
-            _ = file.Close()  // Error ignored
-            return err
-        }
-    }
-    if err := writer.Flush(); err != nil {
-        _ = file.Close()  // Error ignored
-        return err
-    }
-    return file.Close()
-}
-```
-
-### Fixed Code:
-```go
-func saveHistory(history []string) error {
-    historyPath := getHistoryPath()
-    if historyPath == "" {
-        return nil
-    }
-
-    file, err := os.Create(historyPath)
-    if err != nil {
-        return err
-    }
-    defer func() {
-        if err := file.Close(); err != nil {
-            // Log the error but don't overwrite original error
-            log.Printf("Warning: failed to close history file: %v", err)
-        }
-    }()
-
-    writer := bufio.NewWriter(file)
-    for _, entry := range history {
-        if _, err := writer.WriteString(entry + "\n"); err != nil {
-            return fmt.Errorf("failed to write history entry: %w", err)
-        }
-    }
-    if err := writer.Flush(); err != nil {
-        return fmt.Errorf("failed to flush history writer: %w", err)
-    }
-    return nil
-}
-```
-
----
-
-## Fix #4: Mutex Safety in REPL
-
-**File:** `internal/repl/repl.go`  
-**Issue:** Mutex potential for copying  
-**Location:** Lines ~35-39
-
-### Current Code:
-```go
-// RPNState holds the state for RPN operations in REPL
-type RPNState struct {
-    vars    rpn.VariableStore
-    rpnCalc *rpn.RPN
-}
-
-// getRPNState returns or creates the RPN state
-var rpnStateMu sync.RWMutex
-var rpnState *RPNState
-
-func getRPNState() *RPNState {
-    rpnStateMu.Lock()
-    defer rpnStateMu.Unlock()
-    if rpnState == nil {
-        vars := rpn.NewVariables()
-        rpnState = &RPNState{
-            vars:    vars,
-            rpnCalc: rpn.NewRPN(vars),
-        }
-    }
-    return rpnState
-}
-```
-
-### Fixed Code:
-```go
-// RPNState holds the state for RPN operations in REPL
-// Note: This struct should never be copied
-type RPNState struct {
-    vars    rpn.VariableStore
-    rpnCalc *rpn.RPN
-}
-
-// rpnStateMu protects rpnState
-// Note: The mutex must NOT be copied - keep it as a top-level variable
-var rpnStateMu sync.RWMutex
-var rpnState *RPNState
-
-// getRPNState returns or creates the RPN state
-func getRPNState() *RPNState {
-    // First check with read lock for performance
-    rpnStateMu.RLock()
-    if rpnState != nil {
-        state := rpnState
-        rpnStateMu.RUnlock()
-        return state
-    }
-    rpnStateMu.RUnlock()
-
-    // Need to create - use write lock
-    rpnStateMu.Lock()
-    defer rpnStateMu.Unlock()
-    if rpnState == nil {
-        vars := rpn.NewVariables()
-        rpnState = &RPNState{
-            vars:    vars,
-            rpnCalc: rpn.NewRPN(vars),
-        }
-    }
-    return rpnState
-}
-```
-
----
-
-## Fix #5: Improved Error Context in Percentage Calculator
-
-**File:** `internal/perc/perc.go`  
-**Issue:** Errors not wrapped with context  
-**Location:** Various places
-
-### Current Code:
-```go
-func Parse(input string) (string, error) {
-    // ...
-    result, err := perc.Parse(input)
-    if err != nil {
-        return "", err  // Missing context
-    }
-    return result, nil
-}
-```
-
-### Fixed Code:
-```go
-func Parse(input string) (string, error) {
-    // ...
-    result, err := perc.Parse(input)
-    if err != nil {
-        return "", fmt.Errorf("rpn fallback failed for input %q: %w", input, err)
-    }
-    return result, nil
-}
-```
-
----
-
-## Fix #6: Better Slice Handling in Variables
-
-**File:** `internal/rpn/variables.go`  
-**Issue:** Slice capacity retention in `Clear()`  
-**Location:** Lines ~65-67
-
-### Current Code:
-```go
-func (s *Stack) Clear() {
-    s.values = s.values[:0]  // Retains capacity
-}
-```
-
-### Fixed Code:
-```go
-func (s *Stack) Clear() {
-    // Option 1: Reset to nil (releases memory)
-    s.values = nil
-    
-    // Option 2: Keep capacity but reset length (faster for reuse)
-    // s.values = s.values[:0]
-}
-```
-
-### Recommendation:
-Use Option 1 (nil) if memory usage is a concern, Option 2 if stack will be reused immediately.
-
----
-
-## Fix #7: Performance Optimization in Variables
-
-**File:** `internal/rpn/variables.go`  
-**Issue:** Allocations in hot paths  
-**Location:** `ListVariables`
-
-### Current Code:
-```go
-func (v *Variables) ListVariables() []VariableInfo {
-    v.mu.RLock()
-    defer v.mu.RUnlock()
-    
-    var infos []VariableInfo  // New allocation each call
-    for name, value := range v.variables {
-        infos = append(infos, VariableInfo{Name: name, Value: value})
-    }
-    // ...
-}
-```
-
-### Fixed Code (Option 1 - Pre-allocation):
-```go
-func (v *Variables) ListVariables() []VariableInfo {
-    v.mu.RLock()
-    defer v.mu.RUnlock()
-    
-    // Pre-allocate slice with known capacity
-    infos := make([]VariableInfo, 0, len(v.variables))
-    for name, value := range v.variables {
-        infos = append(infos, VariableInfo{Name: name, Value: value})
-    }
-    
-    // Sort by name for consistent output
-    sort.Slice(infos, func(i, j int) bool {
-        return infos[i].Name < infos[j].Name
-    })
-    
-    return infos
-}
-```
-
-### Fixed Code (Option 2 - Cached Result):
-```go
-// For frequently accessed data, consider caching
-func (v *Variables) ListVariables() []VariableInfo {
-    v.mu.RLock()
-    defer v.mu.RUnlock()
-    
-    // Create a copy to avoid holding the lock during sorting
-    infos := make([]VariableInfo, 0, len(v.variables))
-    for name, value := range v.variables {
-        infos = append(infos, VariableInfo{Name: name, Value: value})
-    }
-    
-    // Release lock before sorting (long operation)
-    v.mu.RUnlock()
-    
-    // Sort outside the critical section
-    sort.Slice(infos, func(i, j int) bool {
-        return infos[i].Name < infos[j].Name
-    })
-    
-    return infos
-}
-```
-
----
-
-## Testing the Fixes
-
-After applying fixes, run:
-
-```bash
-# Run all tests with race detector
-go test -race ./...
-
-# Run with coverage
-go test -coverprofile=coverage.out ./...
-go tool cover -func=coverage.out
-
-# Check for linter issues
-go vet ./...
-golangci-lint run
-```
-
----
-
-## Summary of Key Changes
-
-| Fix | File | Change | Impact |
-|-----|------|--------|--------|
-| #1 | `rpn.go` | Error wrapping | Better debugging |
-| #3 | `repl.go` | Proper resource cleanup | No resource leaks |
-| #4 | `repl.go` | Mutex safety | Thread safety |
-| #5 | `perc.go` | Error context | Better error messages |
-| #6 | `variables.go` | Slice handling | Memory management |
-| #7 | `variables.go` | Performance optimization | Reduced allocations |
-
-Each fix addresses specific Go anti-patterns identified in the audit while maintaining code correctness and improving maintainability.
diff --git a/LOGO.txt b/LOGO.txt
deleted file mode 100644
index 9474ff4..0000000
--- a/LOGO.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-  _____             _____
- |  __ \           |  __ \
- | |  | | ___  __ _| |  | | _____   __
- | |  | |/ _ \/ _` | |  | |/ _ \ \ / /
- | |__| |  __/ (_| | |__| |  __/\ V /
- |_____/ \___|\__, |_____/ \___| \_/
-               __/ |
-              |___/
-
-gt - Percentage Calculator with RPN Support
-
- stylized 'gt' with calculator motif
diff --git a/coverage.json b/coverage.json
deleted file mode 100644
index 6c66dfa..0000000
--- a/coverage.json
+++ /dev/null
@@ -1 +0,0 @@
-{"coverage": 80.6}
diff --git a/repl_coverage.out b/repl_coverage.out
deleted file mode 100644
index 060575e..0000000
--- a/repl_coverage.out
+++ /dev/null
@@ -1,173 +0,0 @@
-mode: atomic
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