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79 lines
2.0 KiB
79 lines
2.0 KiB
package cmd
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/*
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Copyright © 2020 Jean-Marc Meessen, ON4KJM <on4kjm@gmail.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import (
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"os"
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//"log"
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"fmt"
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"path/filepath"
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)
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// does the target file exist?
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// is the file defined
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// remove the extention
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//returning "" is considered as invalid
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func buildOutputFilename(output string, input string, overwrite bool) (outputFilename string, wasOK bool) {
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outputFilename = ""
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//validate that input is populated (should never happen if properly called)
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if input == "" {
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return "", false
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}
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//No output was provided, let's create one from the input file
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if output == "" {
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extension := filepath.Ext(input)
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outputRootPart := input[0 : len(input)-len(extension)]
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output = outputRootPart + ".adi"
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fmt.Println("No output provided, defaulting to \"" + output + "\"")
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}
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//an output was provided by the user
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if output != "" {
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info, err := os.Stat(output)
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if os.IsNotExist(err) {
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return output, true
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}
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//It exisits but is a directory
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if info.IsDir() {
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fmt.Println("Error: specified output exists and is a directory")
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return "", false
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}
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if overwrite {
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//user accepted to overwrite the file
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return output, true
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} else {
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fmt.Println("File already exists. Use --overwrite flag if necessary.")
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return "", false
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}
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}
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return outputFilename, true
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}
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// fileExists checks if a file exists and is not a directory before we
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// try using it to prevent further errors.
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func fileExists(filename string) bool {
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info, err := os.Stat(filename)
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if os.IsNotExist(err) {
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return false
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}
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return !info.IsDir()
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}
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