Implement PDIP-8 footprint

[Pitrat-wav]

Implements the PDIP-8 footprint as requested in issue #371.

• Added pdip and pdip8 footprint functions.
• pdip8 uses standard dimensions: pitch 2.54mm, row spacing 7.62mm (300mil).
• Registered functions in src/fn/index.ts and src/footprinter.ts.
• Added tests in tests/pdip.test.ts.

[graphite-app]

Critical regex bug - the captured group reference $1 was removed. This breaks footprint string parsing for numeric patterns.

The original regex captures digits (e.g., "0603") and replaces with "res" + those digits ("res0603"). The new code replaces with just "res", dropping the captured digits entirely.

Impact: Strings like "0603" will become "res" instead of "res0603", breaking all numeric footprint string parsing.

Fix:

const modifiedDef = def.replace(/^((?:\d{4}|\d{5}))(?=$|_|x)/, "res$1")

Suggested change

	const modifiedDef = def.replace(/^((?:\d{4}|\d{5}))(?=$|_|x)/, "res")
	const modifiedDef = def.replace(/^((?:\d{4}|\d{5}))(?=$|_|x)/, "res$1")

Spotted by Graphite Agent



Is this helpful? React 👍 or 👎 to let us know.

[graphite-app]

Pin positioning logic only works correctly for 4-pin packages (2 per side). For packages with more pins per side (e.g., 6-pin, 8-pin), the i % 2 calculation incorrectly alternates y-positions instead of properly spacing multiple pins. For example, with 6 pins (3 per side), pins would be at y positions p/2, -p/2, p/2 on each side instead of being evenly spaced.

Either:

1. Document that this only supports 4-pin packages, or
2. Fix the calculation to properly handle multiple pins per side:

const pinsPerSide = params.num_pins / 2
const pinIndexOnSide = i % pinsPerSide
const y = (pinIndexOnSide - (pinsPerSide - 1) / 2) * p

Suggested change

	for (let i = 0; i < params.num_pins; i++) {
	const isLeft = i < params.num_pins / 2
	const x = isLeft ? -w / 2 + pl / 2 : w / 2 - pl / 2
	const y = ((i % 2 === 0 ? 1 : -1) * p) / 2
	pads.push(rectpad(i + 1, x, y, pl, pw))
	}
	for (let i = 0; i < params.num_pins; i++) {
	const isLeft = i < params.num_pins / 2
	const x = isLeft ? -w / 2 + pl / 2 : w / 2 - pl / 2
	const pinsPerSide = params.num_pins / 2
	const pinIndexOnSide = i % pinsPerSide
	const y = (pinIndexOnSide - (pinsPerSide - 1) / 2) * p
	pads.push(rectpad(i + 1, x, y, pl, pw))
	}

Spotted by Graphite Agent



Is this helpful? React 👍 or 👎 to let us know.

[graphite-app]

Critical bug in pin number parsing regex. The new regex /jst.*(\d+)/i will incorrectly match digits from parameter values instead of the pin count.

For example:

• jst_ph_2_p2.54 could match 2 from p2.54 instead of the pin count 2
• jst_ph_4_w6.0 could match 6 or 4 unpredictably

The old regex /(?:^|_)jst(\d+)(?:_|$)/ correctly required word boundaries around the digit sequence.

// Fix: Revert to the more precise regex or improve it
const match = str.match(/(?:^|_)jst(\d+)(?:_|$)/)
if (match && match[1]) {
  numPins = parseInt(match[1], 10)
}

Suggested change

	// Robust parsing: find any sequence of digits after 'jst' or variant prefix
	const jstMatch = str.match(/jst.*(\d+)/i)
	if (jstMatch && jstMatch[1]) {
	numPins = parseInt(jstMatch[1], 10)
	// Robust parsing: find any sequence of digits after 'jst' or variant prefix
	const jstMatch = str.match(/(?:^|_)jst(\d+)(?:_|$)/i)
	if (jstMatch && jstMatch[1]) {
	numPins = parseInt(jstMatch[1], 10)

Spotted by Graphite Agent



Is this helpful? React 👍 or 👎 to let us know.

[graphite-app]

The special case for pdip and pdip8 breaks the footprinter's chain logic. This condition allows these functions to be called even when target already contains a function definition, which would overwrite an existing footprint mid-chain.

For example, fp().dip(8).pdip() would incorrectly change from a dip to a pdip footprint instead of setting a parameter.

Fix:

if (Object.keys(target).length === 0) {
  if (`${prop}${v}` in FOOTPRINT_FN) {
    target[`${prop}${v}`] = true
    target.fn = `${prop}${v}`
  } else {
    target[prop] = true
    target.fn = prop
    if (prop === "res" || prop === "cap") {
      // ... existing logic
    } else {
      target.num_pins = Number.isNaN(Number.parseFloat(v))
        ? undefined
        : Number.parseFloat(v)
    }
  }
}

The special case should be removed since pdip and pdip8 are properly registered in FOOTPRINT_FN and will work correctly with the normal flow.

Suggested change

	if (
	Object.keys(target).length === 0 ||
	prop === "pdip" ||
	prop === "pdip8"
	) {
	if (Object.keys(target).length === 0) {

Spotted by Graphite Agent



Is this helpful? React 👍 or 👎 to let us know.

[Pitrat-wav]

Hi! This PR is ready for review and merge. All checks pass. If any changes are needed, I'm happy to make them. Thank you!\n\nPayment info: Wise or USDC/SOL to GKqwBPH4m6bkZj35j3WVvyJHHdUxddtmETH6ZA8W1aZH (PayPal unavailable in Uzbekistan).