John Roll

I built software systems for large astronomical instrumentation at Smithsonian Astrophysical Observatory for 27 years. I was at Meta Platforms nee Facebook between 2014 and 2024. Now I'm in Old Schenectady or the Catskills of NY.

JBR in discussions

  If you are not writing code that writes code you are doing it wrong.

.

  Tcl's detractors like to harsh on the Tcl mantra "every thing is a string".  I
  like consider the corollary of this : Code is data is code.

Tcl Things

• PickPic
• ELF reader in pure Tcl
• risc-v assembler
• traceproc helper
• TNA - A numeric array type for Tcl
• arec - An array of records structure for Tcl
• Deadfish
• dict lappend2
• dict get?
• string chunk
• 2013.0321 - Experience with nodejs and why Tcl is better
• patience sort and the longest increasing subsequence
• minimal coroutine iterator
• Perplexing issue with Tcl DDE
• JBR's tcloo.tcl - simple tcloo helpers.
• critcl::cproc nproc : Number of processors
• Operator precedence expression parser
• C level Thread Pool
• Numeric arrays in pure Tcl
• Canvas Structured Graphics
• sqlite3 full text search example
• modify a proc's behavior with a shim
• I wrote this thing for Using Perl to get Excel sheets from ascii
• I wrote procargs because I got tired of long long proc argument lists
• RS wrote a tiny htext hypertext help widget which I improve in htext2
• Beginning a tiny spreadsheet
• A different FORTH interpreter.
• ds9 image display
• Wikit page references as attributes
• ip-drop an adaptive firewall for linux
• cstat - distributed system status client/server
• Laying out widgets in a grid
• Writing DXF
• Talking to a Delta Tau PMAC
• TCP and recv
• Subst template expansion helpers
• Parsing Excel XLSX
• unsource - inline the content of "source" commands.
• parser-actions - generate Parser Tools action procs from peg grammer and template files.
• Playing ISBL - a little database query language
• Mavica 411 image conversion