Repository navigation
Expand file tree
/
Copy pathmetadata.go
More file actions
123 lines (100 loc) · 2.62 KB
/
Copy pathmetadata.go
File metadata and controls
123 lines (100 loc) · 2.62 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
package parser
import (
"strings"
"time"
"github.com/verless/verless/model"
)
const (
// dateFormat is the default date format expected for
// the Date field in Markdown files.
dateFormat = "2006-01-02"
)
type (
// metadata represents a set of metadata.
metadata map[string]interface{}
// assignFn is a function that takes a value and assigns
// that value to an enclosed struct field. For example:
//
// setID := func(val interface{}) {
// user.ID = val.(int)
// }
//
// func setter(setID assignFn) {
// setID(1)
// }
//
// setter(setID)
//
// Type-asserting val to int in a closure avoids that the
// setter function has to be re-written for each data type.
assignFn func(val interface{})
)
// readMetadata reads values from a metadata map and assigns the
// values to the fields of a model.Page instance.
func readMetadata(metadata metadata, page *model.Page) {
readPrimitive(metadata["Title"], func(val interface{}) {
page.Title = val.(string)
})
readPrimitive(metadata["Author"], func(val interface{}) {
page.Author = val.(string)
})
readDate(metadata["Date"], func(val interface{}) {
page.Date = val.(time.Time)
})
readList(metadata["Tags"], func(val interface{}) {
name := val.(string)
page.Tags = append(page.Tags, model.Tag{
Name: name,
Href: "/tags/" + strings.ToLower(name),
})
})
readPrimitive(metadata["Img"], func(val interface{}) {
page.Img = val.(string)
})
readPrimitive(metadata["Credit"], func(val interface{}) {
page.Credit = val.(string)
})
readPrimitive(metadata["Description"], func(val interface{}) {
page.Description = val.(string)
})
readList(metadata["Related"], func(val interface{}) {
page.AddProvidedRelated(val.(string))
})
readPrimitive(metadata["Type"], func(val interface{}) {
page.SetProvidedType(val.(string))
})
readPrimitive(metadata["Hidden"], func(val interface{}) {
page.Hidden = val.(bool)
})
}
// readPrimitive converts a field to a primitive value and
// invokes the assignFn with that value.
func readPrimitive(field interface{}, assign assignFn) {
if field == nil {
return
}
assign(field)
}
// readPrimitive converts a field to a date and invokes the
// assignFn with that date.
func readDate(field interface{}, assign assignFn) {
if field == nil {
return
}
date, err := time.Parse(dateFormat, field.(string))
if err != nil {
panic(err)
}
assign(date)
}
// readList converts a field to a list and invokes the
// assignFn for each item in that list.
func readList(field interface{}, assign assignFn) {
if field == nil {
return
}
list, _ := field.([]interface{})
for i := 0; i < len(list); i++ {
assign(list[i])
}
}