go.chromium.org/luci@v0.0.0-20240309015107-7cdc2e660f33/common/git/footer/tag.go (about)

     1  // Copyright 2020 The LUCI Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package footer
    16  
    17  import (
    18  	"regexp"
    19  	"strings"
    20  
    21  	"go.chromium.org/luci/common/data/strpair"
    22  )
    23  
    24  var metadataPattern = regexp.MustCompile(`^([A-Z_]+)=(.*)$`)
    25  
    26  // ParseLegacyMetadata extracts legacy style `<KEY>=<value>` metadata from
    27  // the given message. Unlike git footer, this works across *all* lines
    28  // instead of the last paragraph only.
    29  // Returns a multimap as a key may map to multiple values. The metadata defined
    30  // in a latter line takes precedence and shows up at the front of the value
    31  // slice.
    32  func ParseLegacyMetadata(message string) strpair.Map {
    33  	lines := strings.Split(message, "\n")
    34  	ret := strpair.Map{}
    35  	for i := len(lines) - 1; i >= 0; i-- {
    36  		res := metadataPattern.FindStringSubmatch(lines[i])
    37  		if len(res) == 3 {
    38  			ret.Add(res[1], strings.TrimSpace(res[2]))
    39  		}
    40  	}
    41  	return ret
    42  }