Comments (8)
I'd love some suggestions for what this might look like!
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Wouldn't it be something like:
func IsFile(path string) (bool, error) {
s, err := os.Stat(path)
if err != nil {
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
return !s.IsDir(), nil
}
from script.
Sorry—my fault for not being clear. Yes, the implementation would probably look something like what you quoted, though we need to think about whether we should consider both files and directories to 'exist'.
The more difficult question is about how it would work within script
pipelines. For example, would it be something like:
script.IfExists("/srv/foo/config.txt").Exec("/usr/bin/configure-service")
What do you think? A use case would be helpful here. Have you ever written a script which has logic based on whether or not a file exists?
from script.
Here are some examples I have on hand (in shell:)
if [ -f $x ]; then
cat $x
else
ls $x --color
fi
if [ -f "$HOME/.goobook_auth.json" ]; then
goobook query '' >> "$TMP"
< $TMP grep -v '^ ' | sponge $TMP
fi
if [ -f "$HOME/.dbic.json" ]; then
export DBIC_TRACE_PROFILE="$HOME/.dbic.json"
fi
if [[ ! -f ~/.dotfilecheck ]]; then
echo $(($EPOCHSECONDS+60*60*24*7)) > ~/.dotfilecheck
fi
from script.
Great! Would you mind writing out one of these examples using script
, as you would like to see it?
from script.
@frioux (or anyone else) do you have any comments on the proposed design?
from script.
from script.
Well, then it's even more helpful of you to pop in and make suggestions! I appreciate it.
Here's the final result:
// IfExists tests whether the specified file exists, and returns a pipe whose
// error status reflects the result. If the file doesn't exist, the pipe's error
// status will be set, and if the file does exist, the pipe will have no error
// status.
func IfExists(filename string) *Pipe {
_, err := os.Stat(filename)
if err != nil {
return NewPipe().WithError(err)
}
return NewPipe()
}
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