github.com/slspeek/camlistore_namedsearch@v0.0.0-20140519202248-ed6f70f7721a/cmd/camtool/search.go (about)

     1  /*
     2  Copyright 2014 The Camlistore Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8       http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package main
    18  
    19  import (
    20  	"encoding/json"
    21  	"flag"
    22  	"fmt"
    23  	"io/ioutil"
    24  	"os"
    25  	"strings"
    26  
    27  	"camlistore.org/pkg/cmdmain"
    28  	"camlistore.org/pkg/search"
    29  )
    30  
    31  type searchCmd struct {
    32  	server   string
    33  	limit    int
    34  	describe bool
    35  }
    36  
    37  func init() {
    38  	cmdmain.RegisterCommand("search", func(flags *flag.FlagSet) cmdmain.CommandRunner {
    39  		cmd := new(searchCmd)
    40  		flags.StringVar(&cmd.server, "server", "", "Server to search. "+serverFlagHelp)
    41  		flags.IntVar(&cmd.limit, "limit", 0, "Limit number of results. 0 is default. Negative means no limit.")
    42  		flags.BoolVar(&cmd.describe, "describe", false, "Describe results as well.")
    43  		return cmd
    44  	})
    45  }
    46  
    47  func (c *searchCmd) Describe() string {
    48  	return "Execute a search query"
    49  }
    50  
    51  func (c *searchCmd) Usage() {
    52  	fmt.Fprintf(os.Stderr, "Usage: camtool [globalopts] search <expr or Constraint JSON>\n")
    53  }
    54  
    55  func (c *searchCmd) Examples() []string {
    56  	return []string{
    57  		`"loc:paris is:portrait" # expression`,
    58  		`'{"blobrefPrefix":"sha1-f00d"}' # SearchConstraint JSON`,
    59  		`- # piped from stdin`,
    60  	}
    61  }
    62  
    63  func (c *searchCmd) RunCommand(args []string) error {
    64  	if len(args) != 1 {
    65  		return cmdmain.UsageError("requires search expression or Constraint JSON")
    66  	}
    67  	q := args[0]
    68  	if q == "-" {
    69  		slurp, err := ioutil.ReadAll(cmdmain.Stdin)
    70  		if err != nil {
    71  			return err
    72  		}
    73  		q = string(slurp)
    74  	}
    75  	q = strings.TrimSpace(q)
    76  
    77  	req := &search.SearchQuery{
    78  		Limit: c.limit,
    79  	}
    80  	if plausibleJSON(q) {
    81  		cs := new(search.Constraint)
    82  		if err := json.NewDecoder(strings.NewReader(q)).Decode(&cs); err != nil {
    83  			return err
    84  		}
    85  		req.Constraint = cs
    86  	} else {
    87  		req.Expression = q
    88  	}
    89  	if c.describe {
    90  		req.Describe = &search.DescribeRequest{}
    91  	}
    92  
    93  	cl := newClient(c.server)
    94  	res, err := cl.Search(req)
    95  	if err != nil {
    96  		return err
    97  	}
    98  	resj, err := json.MarshalIndent(res, "", "  ")
    99  	if err != nil {
   100  		return err
   101  	}
   102  	resj = append(resj, '\n')
   103  	_, err = os.Stdout.Write(resj)
   104  	return err
   105  }
   106  
   107  func plausibleJSON(s string) bool {
   108  	return strings.HasPrefix(s, "{") && strings.HasSuffix(s, "}")
   109  }