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package main
import (
"bytes"
"fmt"
"go/parser"
"go/printer"
"go/token"
"io/ioutil"
"os"
"github.com/mgutz/ansi"
"golang.org/x/tools/go/ast/astutil"
)
// ProcessFileAST processes the files using golang's AST parser
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")
yellow := ansi.ColorCode("yellow+bh")
blackOnWhite := ansi.ColorCode("black+b:white+h")
//Reset the color
reset := ansi.ColorCode("reset")
fmt.Println(blackOnWhite+"Processing file", filePath, "in SAFE MODE", reset)
// New FileSet to parse the go file to
fSet := token.NewFileSet()
// Parse the file
file, err := parser.ParseFile(fSet, filePath, nil, parser.ParseComments)
if err != nil {
fmt.Println(err)
return
}
// Keep track of number of changes
changed := false
if changed = astutil.RewriteImport(fSet, file, from, to); changed {
fmt.Println(red +
"Updating import " +
reset + white +
from +
reset + red +
" to " +
reset + white +
to +
reset)
}
// If the number of changes are more than 0, write file
if changed {
// Print the new AST tree to a new output buffer. These Config settings intended to match gofmt.
printerMode := printer.TabIndent | printer.UseSpaces
printConfig := &printer.Config{Mode: printerMode, Tabwidth: 8}
var outputBuffer bytes.Buffer
err := printConfig.Fprint(&outputBuffer, fSet, file)
if err != nil {
fmt.Println(err)
return
}
ioutil.WriteFile(filePath, outputBuffer.Bytes(), os.ModePerm)
fmt.Println(yellow+
"File",
filePath,
"saved",
reset, "\n\n")
} else {
fmt.Println(yellow+
"No changes to write on this file.",
reset, "\n\n")
}
}
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