chore: Re-structure workspaces, enforce build order

These are some changes in the way the monorepo is structured,
that are aimed at making it easier to get started.

There are two important changes:

**Multiple workspaces**

We had a yarn workspaces setup at `packages/*`. But our monorepo has
grown to 92 packages which can be overwhelming for people not familiar
with the package names.

To remedy this, I've split it into 4 different workspaces:

- `designs/*`: Holds FreeSewing designs (think patterns)
- `plugins/*`: Holds FreeSewing plugins
- `packages/*`: Holds other packages published on NPM
- `sites/*`: Holds software that is not published as an NPM package,
  such as our various websites and backend API

This should make it easier to find things, and to answer questions like
*where do I find the code for the plugins*.

**Updated reconfigure script to handle build order**

One problem when bootstrapping the repo is inter-dependencies between
packages. For example, building a pattern will only work once
`plugin-bundle` is built. Which will only work once all plugins in the
bundle or built. And that will only work when `core` is built, and so
on.

This can be frustrating for new users as `yarn buildall` will fail.
And it gets overlooked by seasoned devs because they're likely to have
every package built in their repo so this issue doesn't concern them.

To remedy this, we now have a `config/build-order.mjs` file and the
updated `/scripts/reconfigure.mjs` script will enforce the build order
so that things *just work*.

plugins/plugin-export-dxf/src/dxf.js

@@ -0,0 +1,248 @@
+import { name, version, description, author, license } from '../package.json'
+
+function Dxf(config) {
+  this.config = config
+}
+
+// Round to 2 decimals because DXF is stupid
+Dxf.prototype.round = function (val) {
+  return Math.round(val * 100) / 100
+}
+
+/** Returns DXF code for optional banner */
+Dxf.prototype.banner = function (pattern) {
+  return `999
+${name.slice(1)} | v${version}
+999
+${description}
+999
+(c) ${new Date().getFullYear()} ${author}
+999
+License: ${license}
+999
+Pattern: ${pattern.config.name} | v${pattern.config.version}
+999
+Export date: ${new Date().toISOString()}`
+}
+
+/** Returns DXF code for tables */
+Dxf.prototype.tables = function (tables) {
+  let dxf = `
+  0
+SECTION
+  2
+TABLES`
+  for (let lineType of tables.lineTypes)
+    dxf += `
+  0
+TABLE
+  2
+LTYPE
+  0
+LTYPE
+  2
+${lineType.name}
+  3
+${lineType.description}
+ 72
+65
+ 73
+0
+ 40
+0.00
+  0
+ENDTAB`
+  for (let layer of tables.layers)
+    dxf += `
+  0
+TABLE
+  2
+LAYER
+  0
+LAYER
+  2
+${layer.name}
+ 62
+${layer.color}
+  6
+${layer.lineType}
+  0
+ENDTAB`
+  dxf += `
+  0
+ENDSEC`
+
+  return dxf
+}
+
+/** Returns DXF code to close/end a DXF file */
+Dxf.prototype.footer = function () {
+  return `
+  0
+EOF
+`
+}
+
+/** Returns DXF code for a line */
+Dxf.prototype.line = function (to, layer) {
+  return `
+  0
+VERTEX
+  8
+${layer}
+ 10
+${this.round(to.x)}
+ 20
+${this.round(to.y)}`
+}
+
+/** Returns DXF code for a curve */
+Dxf.prototype.curve = function (from, cp1, cp2, to, layer, part) {
+  let { Path } = part.shorthand()
+  let path = new Path().move(from).curve(cp1, cp2, to)
+  let steps = Math.floor(path.length() / this.config.precision)
+  let current
+  let dxf = ''
+  for (let i = 1; i < steps; i++) {
+    current = path.shiftAlong(i * this.config.precision)
+    dxf += this.line(current, layer)
+  }
+  if (current.dist(to) > 0.1) dxf += this.line(to, layer)
+
+  return dxf
+}
+
+/** Returns DXF code for a Path object */
+Dxf.prototype.path = function (path, layer, part) {
+  let dxf = `
+  0
+POLYLINE
+  8
+${layer}
+ 70
+1`
+  let current, start
+  for (let op of path.ops) {
+    switch (op.type) {
+      case 'move':
+        start = op.to
+        dxf += this.line(op.to, layer)
+        break
+      case 'line':
+        dxf += this.line(op.to, layer)
+        break
+      case 'curve':
+        dxf += this.curve(current, op.cp1, op.cp2, op.to, layer, part)
+        break
+      case 'close':
+        dxf += this.line(start, layer)
+        break
+      case 'noop':
+        break
+      default:
+        throw new Error(`Unsupported path operation: ${op.type}`)
+    }
+    current = op.to
+  }
+  dxf += `
+  0
+SEQEND`
+
+  return dxf
+}
+
+/** Returns blocs portion of the DXF code for a Part object */
+Dxf.prototype.partBlocks = function (part, name, layer = 1) {
+  let dxf = `
+  0
+BLOCK
+  8
+${layer}
+  2
+${name}
+ 70
+0
+ 10
+0.00
+ 20
+0.00`
+  for (let key in part.paths) {
+    this.pathName = key
+    this.partName = name
+    let path = part.paths[key]
+    if (path.render) dxf += this.path(path, layer, part)
+  }
+  dxf += `
+  0
+ENDBLK`
+
+  return dxf
+}
+
+/** Returns entities portion of the DXF code for a Part object */
+Dxf.prototype.partEntities = function (part, name, layer = 1) {
+  return `
+  0
+INSERT
+  8
+${layer}
+  2
+${name}
+ 10
+0.00
+ 20
+0.00`
+}
+
+/** Exports (drafted) pattern as DXF-ASTM */
+Dxf.prototype.render = function (pattern) {
+  // Ensure pattern layout
+  pattern.pack()
+
+  // Tables structure
+  let tables = {
+    lineTypes: [
+      {
+        name: 'CONTINUOUS',
+        description: 'SOLIDLINE',
+      },
+    ],
+    layers: [
+      {
+        name: 1,
+        color: 7,
+        lineType: 'CONTINIOUS',
+      },
+    ],
+  }
+
+  let dxf = ''
+  dxf += this.banner(pattern)
+  dxf += this.tables(tables)
+  dxf += `
+  0
+SECTION
+  2
+BLOCKS`
+  for (let partId in pattern.parts) {
+    if (pattern.parts[partId].render) dxf += this.partBlocks(pattern.parts[partId], partId)
+  }
+  dxf += `
+  0
+ENDSEC
+  0
+SECTION
+  2
+ENTITIES`
+  for (let partId in pattern.parts) {
+    if (pattern.parts[partId].render) dxf += this.partEntities(pattern.parts[partId], partId)
+  }
+  dxf += `
+  0
+ENDSEC`
+  dxf += this.footer()
+
+  return dxf
+}
+
+export default Dxf

plugins/plugin-export-dxf/src/footer.js

@@ -0,0 +1,5 @@
+const footer = `
+0
+EOF
+`
+export default footer

plugins/plugin-export-dxf/src/header.js

@@ -0,0 +1,13 @@
+import { name, version, description, author, license } from '../package.json'
+
+const header = `999
+${name.slice(1)} | v${version}
+999
+${description}
+999
+(c) ${new Date().getFullYear()} ${author}
+999
+License: ${license}
+999`
+
+export default header

plugins/plugin-export-dxf/src/index.js

@@ -0,0 +1,14 @@
+import pkg from '../package.json'
+
+import Dxf from './dxf'
+
+export default {
+  name: pkg.name,
+  version: pkg.version,
+  hooks: {
+    preRender: (svg) => svg.attributes.setIfUnset('freesewing:plugin-export-dxf', pkg.version),
+    postDraft: (pattern, config = { precision: 1 }) => {
+      pattern.exportDxf = () => new Dxf(config).render(pattern)
+    },
+  },
+}