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58 lines
1.7 KiB
58 lines
1.7 KiB
package fleprocess
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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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"fmt"
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"os"
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"path/filepath"
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)
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// buildOutputFilename will try to figure out an output filename (for the case none was provided)
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func buildOutputFilename(output string, input string, overwrite bool, newExtension string) (string, error) {
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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 "", fmt.Errorf("unexpected error: no input file provided")
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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 + newExtension
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fmt.Println("No output provided, defaulting to \"" + output + "\"")
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}
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//process the computed or user-provided output filename
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info, err := os.Stat(output)
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if os.IsNotExist(err) {
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//File doesn't exist, so we're good
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return output, nil
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}
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//It exists but is a directory
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if info.IsDir() {
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return "", fmt.Errorf("error: specified output exists and is a directory")
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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, nil
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}
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return "", fmt.Errorf("file already exists. Use --overwrite flag if necessary")
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}
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