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find_config_file.go
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95 lines (87 loc) · 2.7 KB
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/*
* Copyright (c) 2014, Robert Bieber
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the project's author nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package conflag
import (
"errors"
"io"
"os"
)
func (c *Config) findConfigFile() (
f io.Reader,
args []string,
err error,
) {
err = nil
f = c.file
args = c.args
fileName := c.fileName
foundFlag := false
if c.fileShortFlag != 0 || c.fileLongFlag != "" {
shortFlag := ""
longFlag := ""
if c.fileShortFlag != 0 {
shortFlag = "-" + string([]rune{c.fileShortFlag})
}
if c.fileLongFlag != "" {
longFlag = "--" + c.fileLongFlag
}
for i := len(args) - 1; i >= 0; i-- {
if args[i] == longFlag || args[i] == shortFlag {
if foundFlag {
if closer, ok := f.(io.Closer); ok {
closer.Close()
}
f = nil
err = errors.New("conflag: Duplicate config file flags")
return
} else {
foundFlag = true
}
if i+1 > len(args)-1 {
err = errors.New("conflag: Missing config file name")
return
}
fileName = args[i+1]
// Removing file names and flags from the args so they
// don't cause problems later
args = append(args[:i], args[i+2:]...)
}
}
}
if (f == nil && fileName != "") || foundFlag {
if closer, ok := f.(io.Closer); ok {
closer.Close()
}
f, err = os.Open(fileName)
}
return
}