git ssb

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const assign = Object.assign
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const compose = require('http-compose')
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const pathToRegexp = require('path-to-regexp')
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const zipObject = require('@f/zip-obj')
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module.exports = Routes
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function Routes (routes) {
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  if (typeof arguments[0] === 'string') {
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    return Routes([[arguments[0], arguments[1]]])
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  } else if (arguments[0].length === 2 && typeof arguments[0][0] === 'string') {
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    return Routes([arguments[0]])
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  }
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  return compose(routes.map(route => {
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    if (typeof route === 'function') return route
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    const path = route[0]
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    const handler = route[1]
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    return mount(path, byMethod(handler))
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  }))
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}
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function byMethod (handler) {
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  const methodNames = Object.keys(handler)
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  return typeof handler === 'function'
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    ? ifMethod(handler, 'get')
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    : compose(methodNames.map(methodName => {
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      return ifMethod(handler[methodName], methodName)
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    }))
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}
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function ifMethod (handler, methodName) {
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  var METHOD = methodName.toUpperCase()
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  return function (req, res, context, next) {
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    if (req.method !== METHOD) next()
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    else handler(req, res, context, next)
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  }
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}
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function mount (path, handler) {
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  var keys = []
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  const query = pathToRegexp(path, keys)
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  return function (req, res, context, next) {
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    const url = context && context.url || req.url
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    const matches = query.exec(url)
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    if (matches === null) return next()
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    const nextUrl = req.url.substring(matches[0].length)
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    const keyNames = keys.map(key => key.name)
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    const params = zipObject(keyNames, matches.slice(1))
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    const nextContext = assign({}, context, {
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      url: nextUrl,
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      params: assign(context.params || {}, params)
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    })
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    handler(req, res, nextContext, next)
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  }
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}
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