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int_expander.go
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/
int_expander.go
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// Envish is a library to help you emulate UNIX-like program environments
// in Golang packages
//
// Copyright 2019-present Ganbaro Digital Ltd
// 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 names of the copyright holders nor the names of his
// 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 OWNER 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 envish
import (
shellexpand "github.com/ganbarodigital/go_shellexpand"
)
// expand replaces ${var} or $var in the input string.
func expand(e Expander, fmt string) string {
// do we have an environment to work with?
if e == nil {
return fmt
}
// yes we do
cb := shellexpand.ExpansionCallbacks{
AssignToVar: e.Setenv,
LookupHomeDir: LookupHomeDir,
LookupVar: e.LookupEnv,
MatchVarNames: e.MatchVarNames,
}
// attempt full-on shell expansion
retval, err := shellexpand.Expand(fmt, cb)
// did it work?
if err != nil {
return fmt
}
// yes it did :)
return retval
}