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#!/bin/awk -f
# HAT TRICK
# Copyright (C) 2022 Case Duckworth <acdw@acdw.net>
#
BEGIN {
# Configuration
DEFAULT_CONFIG_MODE = "config"
config_initialize()
config_parse(ENVIRON["HT_CONFIG"] ? ENVIRON["HT_CONFIG"] : "ht.conf")
# State
DEFTAG = CONFIG["default_tag"]
DEFATTR = CONFIG["default_attr"]
TAG = DEFTAG
ATTR = DEFATTR
}
# Handle raw sections
$0 ~ CONFIG["raw_delim"] {
RAW = ! RAW
if (RAW) {
buflush()
bufpush(CONFIG["raw_beg"], -1)
} else {
bufpush(CONFIG["raw_end"], -1)
print BUFFER
BUFFER = ""
}
next
}
RAW {
bufpush($0)
next
}
# Comments
$0 ~ ("^" COMMENT_DELIM) {
next
}
# HTML escape hatch
/^</ {
HTML = 1
bufpush($0)
next
}
# Sure, let's do templating! This makes it less... weird.
/\$/ {
# XXX: This is probably the dumbest way to do it.
gsub(/\$\$/, "$\a", $0)
gsub(/\$[^\a]/, "\\\\&", $0)
gsub(/\$\a/, "$", $0)
}
# Blocks of text
/./ {
# EOL escape
if (match($0, /\\$/)) {
sep = -1
$0 = substr($0, 1, RSTART - 1)
} else {
sep = "\n"
}
# Loop through BLOCK_TYPES
for (bt in BLOCK_TYPES) {
if (match($0, "^" bt "[ \t]*")) {
$0 = substr($0, RSTART + RLENGTH)
if (match(BLOCK_TYPES[bt], "[ \t]*>[ \t]*")) {
parent = substr(BLOCK_TYPES[bt], 1, RSTART - 1)
child = substr(BLOCK_TYPES[bt], RSTART + RLENGTH)
}
if (parent) {
split(parent, pa, FS)
split(child, bl, FS)
if (! IN_PARENT) {
IN_PARENT = pa[1]
}
TAG = IN_PARENT
ATTR = ""
for (i = 2; i <= length(pa); i++) {
ATTR = ATTR (ATTR ? " " : "") pa[i]
}
bufpush("<" child ">" $0 "</" bl[1] ">")
next # XXX: This is messy.
} else {
split(BLOCK_TYPES[bt], bl, FS)
if (IN_PARENT) {
bufpush("</" IN_PARENT ">")
IN_PARENT = ""
}
if (! BUFFER) {
TAG = bl[1]
for (b = 2; b <= length(bl); b++) {
ATTR = ATTR (ATTR ? " " : "") bl[b]
}
} else {
$0 = "<" BLOCK_TYPES[bt] ">" $0 "</" bl[1] ">"
}
}
}
}
# Loop through LINE_TYPES
for (lt in LINE_TYPES) {
if (match($0, "^" lt "[ \t]*")) {
$0 = substr($0, RSTART + RLENGTH)
templ = LINE_TYPES[lt]
while (match(templ, /\$[0-9]+/)) {
sub(/\$[0-9]+/, $(substr(templ, RSTART + 1, RLENGTH - 1)), templ)
}
$0 = templ
}
}
# Push to buffer
bufpush($0, sep)
}
# Blank lines end blocks
/^$/ {
if (HTML) {
html_end()
}
if (! RAW) {
buflush()
}
}
# Clean up
END {
if (HTML) {
html_end()
} else if (RAW) {
bufpush(CONFIG["raw_end"], -1)
print BUFFER
} else {
buflush()
}
}
### Buffer-y functions
function buflush()
{
buftrim()
if (BUFFER) {
if (TAG) {
TAG_BEG = "<" TAG (ATTR ? " " ATTR : "") ">"
TAG_END = "</" TAG ">"
}
print TAG_BEG BUFFER TAG_END
BUFFER = ""
TAG = DEFTAG
ATTR = DEFATTR
IN_PARENT = ""
}
}
function bufpush(text, separator)
{
if (! separator) {
separator = "\n"
}
if (separator == -1) {
separator = ""
}
BUFFER = BUFFER text (separator ? separator : "")
}
function buftrim()
{
if (match(BUFFER, "\n+$")) {
BUFFER = substr(BUFFER, 1, RSTART - 1)
}
}
### Config functions
function config_initialize()
{
COMMENT_DELIM = ";"
CONFIG["raw_delim"] = "```"
CONFIG["raw_beg"] = "<pre><code>"
CONFIG["raw_end"] = "</code></pre>"
CONFIG["default_tag"] = "p"
CONFIG["default_attr"] = ""
LINE_TYPES["@"] = "<a href=\"$1\">$2</a>"
LINE_TYPES["`"] = "<code>$0</code>"
BLOCK_TYPES["#"] = "h1"
BLOCK_TYPES["##"] = "h2"
BLOCK_TYPES["###"] = "h3"
BLOCK_TYPES["-"] = "ul>li"
}
function config_parse(file)
{
mode = DEFAULT_CONFIG_MODE
while ((getline < file) > 0) {
if (match($0, /^#/) || ! $0) {
continue
}
if (match($0, /^\\/)) {
$0 = substr($0, 2)
}
if (match($0, /\[[^\]]+\]/)) {
mode = substr($0, RSTART + 1, RLENGTH - 2)
continue
} else {
var = $1
val = ""
for (i = 2; i <= NF; i++) {
val = val (val ? " " : "") $i
}
if (mode == "config") {
CONFIG[var] = val
} else if (mode == "block") {
BLOCK_TYPES[var] = val
} else if (mode == "line") {
LINE_TYPES[var] = val
}
}
}
}
### Other functions
function html_end()
{
buftrim()
print BUFFER
BUFFER = ""
HTML = 0
}
|
