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Add --format option to mfs stat command #2706

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merged 5 commits into from
May 18, 2016
Merged

Add --format option to mfs stat command #2706

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4993689
Add --format option to mfs stats command
Kubuxu May 16, 2016
94f1922
Incorporate better moreThanOne function
Kubuxu May 16, 2016
130c08c
Make format logic look much better
Kubuxu May 17, 2016
64677e7
Add sharness tests for files stat format options
Kubuxu May 18, 2016
fea0b94
Replace head piping with --hash option in t0250
Kubuxu May 18, 2016
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68 changes: 63 additions & 5 deletions core/commands/files/files.go
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,8 @@ on the files in question, then data may be lost. This also applies to running
},
}

var formatError = errors.New("Format was set by multiple options. Only one format option is allowed")

var FilesStatCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Display file status.",
Expand All @@ -61,7 +63,24 @@ var FilesStatCmd = &cmds.Command{
Arguments: []cmds.Argument{
cmds.StringArg("path", true, false, "Path to node to stat."),
},
Options: []cmds.Option{
cmds.StringOption("format", "Print statistics in given format. Allowed tokens: "+
"<hash> <size> <cumulsize> <type> <childs>. Conflicts with other format options.").Default(
`<hash>
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This should be prefixed with Hash: <hash> -- otherwise it only prints the hash in one line and then Key: Value format.

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I know this was this way in the past-- it seems like it was a bug.

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It was always like that, changing it would break CLI compatibility.

It is so you could do ipfs files stat /file | head -1 to get the hash before format options were a thing.

Size: <size>
CumulativeSize: <cumulsize>
ChildBlocks: <childs>
Type: <type>`),
cmds.BoolOption("hash", "Print only hash. Implies '--format=<hash>. Conflicts with other format options.").Default(false),
cmds.BoolOption("size", "Print only size. Implies '--format=<cumulsize>. Conflicts with other format options.").Default(false),
},
Run: func(req cmds.Request, res cmds.Response) {

_, err := statGetFormatOptions(req)
if err != nil {
res.SetError(err, cmds.ErrClient)
}

node, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
Expand Down Expand Up @@ -90,19 +109,58 @@ var FilesStatCmd = &cmds.Command{
},
Marshalers: cmds.MarshalerMap{
cmds.Text: func(res cmds.Response) (io.Reader, error) {

out := res.Output().(*Object)
buf := new(bytes.Buffer)
fmt.Fprintln(buf, out.Hash)
fmt.Fprintf(buf, "Size: %d\n", out.Size)
fmt.Fprintf(buf, "CumulativeSize: %d\n", out.CumulativeSize)
fmt.Fprintf(buf, "ChildBlocks: %d\n", out.Blocks)
fmt.Fprintf(buf, "Type: %s\n", out.Type)

s, _ := statGetFormatOptions(res.Request())
s = strings.Replace(s, "<hash>", out.Hash, -1)
s = strings.Replace(s, "<size>", fmt.Sprintf("%d", out.Size), -1)
s = strings.Replace(s, "<cumulsize>", fmt.Sprintf("%d", out.CumulativeSize), -1)
s = strings.Replace(s, "<childs>", fmt.Sprintf("%d", out.Blocks), -1)
s = strings.Replace(s, "<type>", out.Type, -1)

fmt.Fprintln(buf, s)
return buf, nil
},
},
Type: Object{},
}

func statGetFormatOptions(req cmds.Request) (string, error) {
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i'd write this function as:

hash, _, _ := req.Option("hash").Bool()
size, _, _ := req.Option("size").Bool()
format, found, _ := req.Option("format").Found()

if moreThanOne(hash, size, found) {
    return "", formatError
}

if hash {
    return "<hash>", nil
} else if size {
    return "<cumulsize>", nil
} else {
    return format, nil
}

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@Kubuxu Kubuxu May 17, 2016 •
edited
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Will do, I was quite sleepy when I was doing it.
EDIT: done


hash, _, _ := req.Option("hash").Bool()
size, _, _ := req.Option("size").Bool()
formatSpecified := req.Option("format").Found()

count := 0
if hash {
count++
}
if size {
count++
}
if formatSpecified {
count++
}
if count > 1 {
return "", formatError
}
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I am 100% sure there is better pattern to do it. My C tainted mind where I would just add them couldn't find it.

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i think this works:

func moreThanOne(a,b,c bool) bool {
    return !((a == b == c) && !(a && b && c)) && (a || b || c)
}

it can probably be reduced...

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better:
return a && b || b && c || a && c

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Right, it is so easy 😢 😄


format := ""
if hash {
format = "<hash>"
}
if size {
format = "<cumulsize>"
}
if len(format) == 0 {
format, _, _ = req.Option("format").String()
}

return format, nil
}

func statNode(ds dag.DAGService, fsn mfs.FSNode) (*Object, error) {
nd, err := fsn.GetNode()
if err != nil {
Expand Down