87 lines
2.9 KiB
Go
87 lines
2.9 KiB
Go
/*
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SysUtils - a library to assist with various system-related functions
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Copyright (C) 2020 Brent Saner
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package exec_extra
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import (
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"os/exec"
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)
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func ExecCmdReturn(cmd *exec.Cmd) (exitStatus int, err error) {
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// https://stackoverflow.com/a/55055100/733214
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err = cmd.Run()
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exitErr, _ := err.(*exec.ExitError)
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exitStatus = exitErr.ExitCode()
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return
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}
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/*
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GetCmdFromStruct takes (a pointer to) a struct and returns a slice of
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strings compatible with os/exec.Cmd.
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The tag name used can be changed by setting the StructTagCmdArgs variable in this module;
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the default is `cmdarg`.
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If the tag value is "-", the field will be skipped. Any other tag value(s) are ignored.
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Tag value format:
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<tag>:"<option>=<value>[,<option>[=<value>],<option>[=<value>]...]"
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e.g.
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cmdarg:"short=l,long=list"
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cmdarg:"short=l"
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cmdarg:"long=list"
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If the tag value is "-", or <VAR NAME> is not provided, the field will be explicitly skipped.
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(This is the default behavior for struct fields not tagged with `cmdarg`.)
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If a cmdarg tag is specified but has no `short` or `long` option value, the field will be skipped entirely.
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If a field's value is nil, it will be skipped.
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Otherwise if a field's value is the zero-value, it will be skipped.
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Recognized options:
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* short - A short flag for the argument
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e.g.:
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struct{
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// If this is an empty string, it will be replaced with the value of $CWD.
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CurrentDir string `envpop:"CWD"`
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// This would only populate with $USER if the pointer is nil.
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UserName *string `envpop:"USER"`
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// This will *always* replace the field's value with the value of $DISPLAY,
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// even if not an empty string.
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// Note the `force` option.
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Display string `envpop:"DISPLAY,force"`
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// Likewise, even if not nil, this field's value would be replaced with the value of $SHELL.
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Shell *string `envpop:"SHELL,force"`
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// This field will be untouched if non-nil, otherwise it will be a pointer to an empty string
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// if FOOBAR is undefined.
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NonExistentVar *string `envpop:"FOOBAR,allow_empty"`
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}
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If s is nil, nothing will be done and err will be errs.ErrNilPtr.
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If s is not a pointer to a struct, nothing will be done and err will be errs.ErrBadType.
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*/
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func GetCmdFromStruct[T any](s T, opts ...cmdArgOpt) (cmdSlice []string, err error) {
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// TODO
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return
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}
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