Skip to content

Instantly share code, notes, and snippets.

set -e
CONTENTS=$(tesseract -c language_model_penalty_non_dict_word=0.8 --tessdata-dir /usr/local/share/tessdata/ "$1" stdout -l eng | xml esc)
hex=$((cat <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "">
<plist version="1.0">
import socket
import struct
import sys
# We want unbuffered stdout so we can provide live feedback for
# each TTL. You could also use the "-u" flag to Python.
class flushfile(file):
def __init__(self, f):
pnc /
Last active May 12, 2020
Using Erlang observer/appmon remotely

Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host
pnc /
Last active Jun 8, 2019

Prepare to spend a little cash on a wild ride. You are about to go from an expensive, Jet-A-enriched glass-and-steel shopping mall to an acoustic-tile-ceilinged underground train pit with a bowling alley on top.

Load up Google Maps and pick the result that has you taking AirTrain to Jamaica, and then a cluster of colorful names including Babylon, Hempstead, Long Beach, Port Jefferson, and Ronkonkoma to Penn Station.

🍹 True fact: Ronkonkoma isn't a real place!

Once in the baggage area of any of the terminals follow the signs for Ground Transportation and then AirTrain. Board (ticketless) a Jamaica Station-bound AirTrain. Do not board a Howard Beach-bound AirTrain. Once at Jamaica Station, swarm with the others to purchase a MetroCard of at least $5 value. I recommend just getting a $20 (plus $1.4536̅6̅ bonus!!!) card for your time here. The UI will try to create a false distinction between an "AirTrain MetroCard" and a normal MetroCard. Do not be fooled. You simply need a card with at least $5 v

pnc / canvas-build.log
Last active Mar 1, 2019
Unaccounted time
View canvas-build.log
npm install --save --build-from-source canvas on master
> canvas@2.3.1 install /Users/phil/Development/creator/node_modules/canvas
> node-pre-gyp install --fallback-to-build
node-pre-gyp WARN Using needle for node-pre-gyp https download
gyp ERR! configure error
gyp ERR! stack Error: Command failed: /usr/local/opt/python/libexec/bin/python -c import sys; print "%s.%s.%s" % sys.version_info[:3];
gyp ERR! stack File "<string>", line 1
gyp ERR! stack import sys; print "%s.%s.%s" % sys.version_info[:3];
pnc /
Last active Aug 6, 2017
Debugging exit status 127 of custom binaries on AWS Lambda

AWS Lambda allows you to run custom binaries as child processes.

However, if the packaged binary you're running on AWS Lambda uses shared libraries, they may not be available in the Lambda environment. If this is the case, your binary will terminate without any output. In my case, the exit status code was 127, which wasn't very helpful (typically this is "command not found.")

2015-11-18T00:50:10.731Z	521db901-8d8e-11e5-b9df-cd31cc90ece2	Calling phantom:  /var/task/phantomjs [ '/var/task/phantomjs-script.js' ]
2015-11-18T00:50:10.809Z	521db901-8d8e-11e5-b9df-cd31cc90ece2	child process exited with code 127

Linux's loader,, allows you (see manpage) to set an environment variable called LD_DEBUG that will output verbose information while the shared libraries are loaded.

Since Lambda doesn't let you set arbitrary environment variables, you need to set the environment

View petstore.yaml
phil@Supernova > java -jar lib/swagger-codegen-cli.jar version
phil@Supernova > java -jar lib/swagger-codegen-cli.jar generate -v -i specs/client/petstore.yaml -l swagger -o output/client/petstore
[main] INFO io.swagger.codegen.config.CodegenConfigurator -
VERBOSE MODE: ON. Additional debug options are injected
- [debugSwagger] prints the swagger specification as interpreted by the codegen
- [debugModels] prints models passed to the template engine
- [debugOperations] prints operations passed to the template engine
- [debugSupportingFiles] prints additional data passed to the template engine
[main] INFO io.swagger.parser.Swagger20Parser - reading from specs/client/petstore.yaml
View gist:621a4e2f22b3edb042e54d9b39994b89
### Keybase proof
I hereby claim:
* I am pnc on github.
* I am pnc ( on keybase.
* I have a public key whose fingerprint is CAE3 A08A 3CFB 5042 82BD 80B8 37B7 21F0 DAE6 961F
To claim this, I am signing this object:
pnc /
Last active Jun 1, 2016
Debugging poolboy checkout errors

Just about the only thing that'll crash the Erlang VM is running out of memory. Although processes themselves are cheap, a good way to run out of memory is to start an unbounded number of processes from an external signal (such as one per web request), and then make each of those processes hold onto some more expensive resource. If you're not careful about cleanup, you can also leak processes, which compounds the problem. Anyway, nobody's perfect, so to avoid these cases, we use the poolboy library in a bunch of places to handle process pools that handle cleanup and limit the total amount of concurrency to some reasonable amount.


  1. all a pool's workers are checked out (by actual organic load/concurrency)
  2. some process is leaking pool workers by not checking them back in (rude)
  3. the pool supervisor isn't responding (it's deadlocked, bugs, etc.)

you'll see "checkout" timeouts (waited longer than the timeout to check out a worker from the pool):

pnc / section.m
Created Feb 1, 2013
Example of using ATV.
View section.m
ATVManagedTableSection *inboxSection = [[ATVManagedTableSection alloc] initWithIdentifier:@"inbox"];
[inboxSection setManagedObjectContext:context andFetchRequest:fetchRequest];
[inboxSection registerNib:@"PIMessageCell" forIdentifier:@"PIMessageCell"];
[inboxSection setCellSource:^UITableViewCell *(ATVTableSection *section, NSUInteger index, id object) {
UITableViewCell *cell = [section dequeueReusableCellWithIdentifier:@"PIMessageCell"];
return cell;
[inboxSection setConfigureCell:^(ATVTableSection *section, UITableViewCell *cell, NSUInteger index, id object) {
PIMessageCell *messageCell = (PIMessageCell *)cell;
[messageCell setMessage:object];
You can’t perform that action at this time.