packages/html.source.sh


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

# Convert special characters to their HTML codes
html::encode () {
    $SED '
        s|\&|\&amp;|g;
        s|<|\&lt;|g;
        s|>|\&gt;|g;
    ' <<< "$@"
}

# Make a HTML paragraph.
html::make_paragraph () {
    local -r text="$1"; shift

    if [[ -n "$text" ]]; then
        echo "<p>$(html::encode "$text")</p>"
    fi
}

# Make a HTML header.
html::make_heading () {
    local -r text=$($SED -E 's/^#+ //' <<< "$1"); shift
    local -r level="$1"; shift
    echo "<h${level}>$(html::encode "$text")</h${level}>"
}

# Make a HTML quotation
html::make_quote () {
    local -r quote="${1/> }"
    echo "<p class=\"quote\"><i>$(html::encode "$quote")</i></p>"
}

# Make a HTML image
html::make_img () {
    local link="$1"; shift
    local descr="$1"; shift

    if [ -z "$descr" ]; then
        echo -n "<a href=\"$link\"><img src=\"$link\" /></a>"
    else
        echo -n "<i>$descr:</i>"
        echo -n "<a href=\"$link\"><img alt=\"$descr\" title=\"$descr\" src=\"$link\" /></a>"
    fi

    echo "<br />"
}

# Make a HTML hyperlink
html::make_link () {
    local link="$1"; shift
    local descr="$1"; shift

    if ! $GREP -F -q '://' <<< "$link"; then
        link=${link/.gmi/.html}
    fi

    if [[ -z "$descr" ]]; then
        descr="$link"
    fi

    echo "<a class=\"textlink\" href=\"$link\">$descr</a><br />"
}

# Convert Gemtext to HTML
html::fromgmi () {
    local is_list=no
    local is_plain=no

    while IFS='' read -r line; do
        if [[ "$is_list" == yes ]]; then
            if [[ "$line" == '* '* ]]; then
                echo "<li>$(html::encode "${line/\* /}")</li>"
            else
                is_list=no
                echo "</ul>"
            fi
            continue

        elif [[ "$is_plain" == yes ]]; then
            if [[ "$line" == '```'* ]]; then
                echo "</pre>"
                is_plain=no
            else
                html::encode "$line"
            fi
            continue
        fi

        case "$line" in
            '* '*)
                is_list=yes
                echo "<ul>"
                echo "<li>${line/\* /}</li>"
                ;;
            '```'*)
                is_plain=yes
                echo "<pre>"
                ;;
            '# '*)
                html::make_heading "$line" 1
                ;;
            '## '*)
                html::make_heading "$line" 2
                ;;
            '### '*)
                html::make_heading "$line" 3
                ;;
            '> '*)
                html::make_quote "$line"
                ;;
            '=> '*)
                generate::make_link html "$line"
                ;;
            *)
                html::make_paragraph "$line"
                ;;
        esac
    done
}

# Test HTML package.
html::test () {
    local line='Hello world! This is a paragraph.'
    assert::equals "$(html::make_paragraph "$line")" '<p>Hello world! This is a paragraph.</p>'

    line=''
    assert::equals "$(html::make_paragraph "$line")" ''

    line='Foo &<>& Bar!'
    assert::equals "$(html::make_paragraph "$line")" '<p>Foo &amp;&lt;&gt;&amp; Bar!</p>'

    line='# Header 1'
    assert::equals "$(html::make_heading "$line" 1)" '<h1>Header 1</h1>'

    line='## Header 2'
    assert::equals "$(html::make_heading "$line" 2)" '<h2>Header 2</h2>'

    line='### Header 3'
    assert::equals "$(html::make_heading "$line" 3)" '<h3>Header 3</h3>'

    line='> This is a quote'
    assert::equals "$(html::make_quote "$line")" '<p class="quote"><i>This is a quote</i></p>'

    line='=> https://example.org'
    assert::equals "$(generate::make_link html "$line")" \
        '<a class="textlink" href="https://example.org">https://example.org</a><br />'

    line='=> index.html'
    assert::equals "$(generate::make_link html "$line")" \
        '<a class="textlink" href="index.html">index.html</a><br />'

    line='=> http://example.org Description of the link'
    assert::equals "$(generate::make_link html "$line")" \
        '<a class="textlink" href="http://example.org">Description of the link</a><br />'

    line='=> http://example.org/image.png'
    assert::equals "$(generate::make_link html "$line")" \
        '<a href="http://example.org/image.png"><img src="http://example.org/image.png" /></a><br />'

    line='=> http://example.org/image.png Image description'
    assert::equals "$(generate::make_link html "$line")" \
        '<i>Image description:</i><a href="http://example.org/image.png"><img alt="Image description" title="Image description" src="http://example.org/image.png" /></a><br />'
}