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
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
package main
import (
"fmt"
"log"
"os"
"strings"
"sort"
"io"
)
const (
bufsize = 512
prefix = `.\"s `
end = `.\"e`
section = `.\"§`
//tableHead = ".TS\nexpand;\nl1w(1.5i) l1w(4.5i)."
//tableFoot = ".TE"
mac = ".ref"
//delim = "()"
)
var tableHead, tableFoot, delim, extraPrefix, extraSuffix string
type Reference struct {
name string
contents string
index int
}
func interpEscape(str string) string {
var rt string
for i := 0; i < len(str); i++ {
if str[i] == '\\' {
i++
if str[i] == 'n' {
rt += "\n"
} else {
rt += "\\n"
}
} else {
rt += string(str[i])
}
}
return rt
}
func getRefTxt(lines []string) string {
var txt string
for _, line := range lines {
if strings.HasPrefix(line, end) {
break
}
txt += line + "\n"
}
return string(txt)
}
func findIndex(refs []Reference, name string) int {
for _, ref := range refs {
if ref.name == name {
return ref.index
}
}
return -1
}
func checkLetter(ch rune) bool {
if ch >= 'A' && ch <= 'Z' ||
ch >= 'a' && ch <= 'z' {
return true
}
return false
}
func checkAllCaps(word string) bool {
for _, ch := range word {
if !checkLetter(ch) {
continue
}
if ch < 'A' || ch > 'Z' {
return false
}
}
return true
}
// Typographic niceties.
func extraFmt(ref string) string {
words := strings.Split(ref, " ")
if checkAllCaps(words[0]) {
words[0] = extraPrefix + words[0] + extraSuffix
}
words[1] = extraPrefix + words[1] + extraSuffix
return words[0] + " " + words[1]
}
func main() {
in := os.Stdin
if len(os.Args) > 1 {
var err error
in, err = os.Open(os.Args[1])
if err != nil {
log.Fatal(err)
}
}
bytes, err := io.ReadAll(in)
if err != nil {
log.Fatal(err)
}
contents := string(bytes)
/* Iterate through the contents of the file twice:
Once to find and index all references.
Again to refer to each reference. */
var refs []Reference
div := -1
lines := strings.Split(contents, "\n")
for i, line := range lines {
if strings.HasPrefix(line, section) {
div = i
words := strings.Split(line, "#")
wc := len(words)
if wc < 4 {
log.Fatal(`Provide 3 arguments in the § split, delimited by #.
• A tbl(7) header
• A tbl(7) footer
• A pair of delimiters for references, such as "()"
Below is an example.
.\"§#.TS\nexpand;\nl1w(1.5i) l1w(4.5i).#.TE#()#\fC#\fP
The final two arguments in that example are optional.`)
}
tableHead = interpEscape(words[1] + "\n")
tableFoot = interpEscape(words[2])
delim = words[3]
if wc > 4 {
extraPrefix = words[4]
}
if wc > 5 {
extraSuffix = words[5]
}
}
}
// If no split, quietly return contents.
if div == -1 {
fmt.Print(contents)
return
}
for i, line := range lines[div:] {
if strings.HasPrefix(line, prefix) {
var ref Reference
ref.name = line[len(prefix):]
// i is relative to the lines after div.
ref.contents = getRefTxt(lines[div+i+1:])
refs = append(refs, ref)
}
}
/* Sort references alphabetically. */
sort.Slice(refs, func(i, j int) bool {
return strings.Compare(refs[i].name, refs[j].name) < 0
})
for i := range refs {
refs[i].index = i
}
// Second pass.
for _, line := range lines[:div] {
if strings.HasPrefix(line, mac) {
var name string
var start, end int
for i := range line {
if line[i] == delim[0] {
start = i+1
}
if line[i] == delim[1] {
end = i
break
}
}
name = line[start:end]
index := findIndex(refs, name)
fmt.Printf(".post.url #%d \"%s\"\n\n", index,
extraFmt(line[start-1:]))
} else {
fmt.Println(line)
}
}
// Format References into AMS Style bibiography.
/* As it turns out, in order to be referenced individually,
each reference needs its own table. */
for _, ref := range refs {
fmt.Printf(".post.name %d\n", ref.index)
fmt.Printf(tableHead)
fmt.Printf("T{\n%c%s%c\nT}", delim[0], extraFmt(ref.name),
delim[1])
fmt.Printf("\tT{\n%sT}\n", ref.contents)
fmt.Println(tableFoot)
}
}
|
