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|
#!/bin/gawk -f
BEGIN {
list = ""
quote = 0
code = 0
}
function handle_meta( i, n, cats, link)
{
if ($0 ~ /^; /) {
if (meta_count == 0) {
} else if (meta_count == 1) {
sub(/^; /, "")
n = split($0, cats, " ")
printf "<nav class=\"categories\">"
printf "#<a class=\"category\" href=\"/writings/\">all</a> "
for (i = 1; i <= n; i++) {
link = "/writings/" cats[i]
printf "<a class=\"category\" href=\"" link "\">#" cats[i] "</a> "
}
print "</nav>"
} else if (meta_count == 2) {
sub(/^; /, "")
print "<p class=\"date\">" $0 "</p>"
}
meta_count++
next
}
}
function handle_list_item(condition, type)
{
if ($0 ~ condition) {
if (list != type) {
if (list != "") print "</" list ">"
print "<" type ">"
list = type
}
sub(condition, "")
print "<li>" $0 "</li>"
next
}
}
function handle_quote()
{
if ($0 == "\"\"\"") {
if (quote == 0) {
print "<blockquote>"
quote = 1
} else {
print "</blockquote>"
quote = 0
}
next
}
}
function handle_codeblock()
{
if ($0 ~ /^'''/) {
if (code == 0) {
if (list != "") {
print "</" list ">"
list = ""
}
print "<pre><code>"
code = 1
} else {
print "</code></pre>"
code = 0
}
next
}
if (code == 1) {
gsub(/&/, "\\&")
gsub(/</, "\\<")
gsub(/>/, "\\>")
print
next
}
}
function inline(delim, tag, escaped, pattern)
{
escaped = delim
gsub(/\*/, "\\*", escaped)
gsub(/\./, "\\.", escaped)
pattern = escaped "([^" escaped "]+)" escaped
while (match($0, pattern)) {
$0 = substr($0, 1, RSTART-1) \
"<" tag ">" substr($0, RSTART+length(delim), \
RLENGTH-length(delim)*2) "</" tag ">" \
substr($0, RSTART+RLENGTH)
}
}
function inline_link(pattern, result, pre, arr)
{
pattern = "\\[([^]]+)\\]\\(([^)]+)\\)"
result = ""
while (match($0, pattern, arr)) {
pre = substr($0, 1, RSTART-1)
result = result pre "<a href=\"" arr[2] "\">" arr[1] "</a>"
$0 = substr($0, RSTART+RLENGTH)
}
$0 = result $0
}
function inline_image(pattern, result, pre, arr)
{
pattern = "!\\[([^]]+)\\]\\(([^)]+)\\)"
result = ""
while (match($0, pattern, arr)) {
pre = substr($0, 1, RSTART-1)
result = result pre "<a href=\"" arr[2] "\">" "<img alt=\"" \
arr[1] "\" src=\"" arr[2] "\">" "</a>"
$0 = substr($0, RSTART+RLENGTH)
}
$0 = result $0
}
function inline_footnote_ref(pattern, result, pre, arr)
{
pattern = ".\\[\\^([^]]+)\\]"
result = ""
while (match($0, pattern, arr)) {
pre = substr($0, 1, RSTART)
result = result pre "<sup id=\"fnref-" \
arr[1] "\"><a href=\"#fn-" arr[1] "\">" arr[1] "</a></sup>"
$0 = substr($0, RSTART+RLENGTH)
}
$0 = result $0
}
function handle_header(i, level)
{
if ($0 ~ /^#+[ ]/) {
level = 0
while (substr($0, level+1, 1) == "#") level++
sub(/^#+[ ]+/, "")
print "<h" level ">" $0 "</h" level ">"
next
}
}
function handle_footnote(pattern, arr)
{
pattern = "^\\[\\^([^]]+)\\]:[ ]*(.*)"
if (match($0, pattern, arr)) {
if (footnote != 1) {
print "<ol class=\"footnotes\">"
footnote = 1
}
print "<li id=\"fn-" arr[1] "\">" arr[2] \
"<a href=\"#fnref-" arr[1] "\">↩</a></li>"
list = "ol"
next
}
}
{
handle_meta()
handle_quote()
handle_codeblock()
inline("**", "b")
inline("*", "em")
inline("--", "s")
inline("'''", "code")
inline_image()
inline_link()
inline_footnote_ref()
handle_list_item("^- ", "ul")
handle_list_item("^[0-9]+\\.[ ]+", "ol")
handle_footnote()
if (list != "") {
print "</" list ">"
list = ""
}
handle_header()
if ($0 != "") {
print "<p>" $0 "</p>"
}
}
END {
if (list != "")
print "</" list ">"
}
|
