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const fs = require('fs')
module.exports = function snippet (md, options = {}) {
const root = options.root || process.cwd()
function parser (state, startLine, endLine, silent) {
const CH = '<'.charCodeAt(0)
const pos = state.bMarks[startLine] + state.tShift[startLine]
const max = state.eMarks[startLine]
// if it's indented more than 3 spaces, it should be a code block
if (state.sCount[startLine] - state.blkIndent >= 4) {
return false
}
for (let i = 0; i < 3; ++i) {
const ch = state.src.charCodeAt(pos + i)
if (ch !== CH || pos + i >= max) return false
}
if (silent) {
return true
}
const start = pos + 3
const end = state.skipSpacesBack(max, pos)
const rawPath = state.src.slice(start, end).trim().replace(/^@/, root)
const filename = rawPath.split(/[{:\s]/).shift()
const content = fs.existsSync(filename) ? fs.readFileSync(filename).toString() : 'Not found: ' + filename
const meta = rawPath.replace(filename, '')
state.line = startLine + 1
const token = state.push('fence', 'code', 0)
token.info = filename.split('.').pop() + meta
token.content = content
token.markup = '```'
token.map = [startLine, startLine + 1]
return true
}
md.block.ruler.before('fence', 'snippet', parser)
}
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