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package main
import (
"bytes"
"fmt"
"go/parser"
"go/printer"
"go/token"
"io/ioutil"
"os"
"path"
"strings"
"github.com/mgutz/ansi"
"golang.org/x/tools/go/ast/astutil"
)
func ProcessFileAST(filePath string, from string, to string) {
//Colors to be used on the console
red := ansi.ColorCode("red+bh")
white := ansi.ColorCode("white+bh")
greenUnderline := ansi.ColorCode("green+buh")
blackOnWhite := ansi.ColorCode("black+b:white+h")
//Reset the color
reset := ansi.ColorCode("reset")
// If the file is a go file scan it
if path.Ext(filePath) == ".go" {
// New FileSet to parse the go file to
fSet := token.NewFileSet()
// Parse the file
file, err := parser.ParseFile(fSet, filePath, nil, 0)
if err != nil {
fmt.Println(err)
}
// Get the list of imports from the ast
imports := astutil.Imports(fSet, file)
// Keep track of number of changes
numChanges := 0
// Iterate through the imports array
for _, mPackage := range imports {
for _, mImport := range mPackage {
// Since astutil returns the path string with quotes, remove those
importString := mImport.Path.Value
// If the path matches the oldpath, replace it with the new one
if strings.Contains(importString, from) {
//If it needs to be replaced, increase numChanges so we can write the file later
numChanges++
// Join the path of the import package with the remainder from the old one after removing the old import package
replacePackage := strings.Replace(importString, from, to, -1)
fmt.Println(red + "Updating import " + importString + " from file " + reset + white + filePath + reset + red + " to " + reset + white + replacePackage + reset)
// Remove the old import and replace it with the replacement
astutil.DeleteImport(fSet, file, importString)
astutil.AddImport(fSet, file, replacePackage)
}
}
}
// If the number of changes are more than 0, write file
if numChanges > 0 {
// Print the new AST tree to a new output buffer
var outputBuffer bytes.Buffer
printer.Fprint(&outputBuffer, fSet, file)
ioutil.WriteFile(filePath, outputBuffer.Bytes(), os.ModePerm)
fmt.Printf(blackOnWhite+"File "+filePath+" saved after %d changes."+reset+"\n", numChanges)
} else {
fmt.Println(greenUnderline + "No changes needed on file " + filePath + reset)
}
}
}
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