Bug fixes: • UI tweaks for macOS 26 • Fixes quasiquote for expressions involving array literals • Fixes the (library ...) directive of cond-expand New features: • New application icon consistent with LispPad Go on iOS • New library for handling locations: (lispkit location) • New library for creating and editing PDF documents: (lispkit pdf) • New library for solving computer vision problems (lispkit vision) supporting optical character recognition, shape detection, barcode recognition, and image classification • New libraries for processing/manipulating images: (lispkit image), (lispkit image process) • New library for drawing maps: (lispkit draw map) • New library for making and drawing snapshots of web pages: (lispkit draw web) • Extensions of library (lispkit draw), including improvements for reading and writing images • Extensions of libraries (lispkit core), (lispkit enum), (lispkit object), and (lispkit date-time) • New sample code: ImageComposition.scm, OCR.scm, MermaidDiagrams.scm, Pinterest.scm

Bug fixes: • Fixed equivalence procedures for bitsets New features: • Support for all major JSON standards with libraries (lispkit json) and (lispkit json schema) • Support for HTTP-based networking with libraries (lispkit http), (lispkit http oauth), and (lispkit http server) • Deeper integrations into macOS via libraries (lispkit system keychain) and (lispkit system pasteboard) • New concurrency features with support for atomic boxes, thread-safe shared queues, and futures via libraries (lispkit box), (lispkit thread shared-queue), and (lispkit thread future) • Support for drawing barcodes via library (lispkit draw barcode) • New libraries: (lispkit url), (lispkit serialize) • Extended libraries: (lispkit thread), (lispkit system), (lispkit bytevector), (lispkit markdown), (lispkit dynamic), and (lispkit control) • New sample code: OAuthDemo.scm, Keychain.scm, WebAPIs.scm, and Webserver.scm

Bug fixes: • Fix saving the content of graphics windows New features: • Provide line-based editing features (delete and duplicate lines) • Support selection of lines • Support duplication of selected text • Implement smarter parenthesis matching

Bug fixes: • Enforce that imported (immutable) definitions cannot be mutated, unless within the read-eval-print loop; export-mutable in library definitions enable mutability • Improved display of OS-level exceptions and errors in read-eval-print loop • Bug fixes in window management API provided by (lisppad system macos) New features: • Revamp of graphics windows with support for a toolbar, zoom, export of drawings, and editing of window properties • Ported universal formatting facility from Common Lisp and made it available via library (lispkit format) • Support customization of read-eval-print-loop result formatting • Library (lispkit records) now supports extensible records compatible with SRFI 131 • Procedure type-of of library (lispkit type) now returns a list of type tags (from most specific to least specific type) • New library (lisppad turtle) supporting indicators for turtles • Support for currencies included in library (lispkit system) • Renamed library (lisppad system) to (lisppad system macos) • Renamed library (lispkit system os) to (lispkit system call) • Extended libraries: (lispkit system), (lispkit port), (lispkit bitset), (lispkit system), (lispkit draw), (lispkit draw turtle), (lispkit core), (lispkit type), (lispkit bytevector), and (lisppad location) • New libraries: (lisppad turtle), (lispkit format), (lispkit crypto), (lispkit archive tar), (lispkit list set), (srfi 239), and (srfi 235) • New sample code: `Blockchain.scm`

Bug fixes: • Improved R7RS regression tests • Bugfixes in library (lispkit bytevector) for procedures bytevector-copy and bytevector-copy! New features: • Revamp of library (lispkit graph) with new procedures: graph-topological-sort, graph-graph-weakly-connected-components, graph-strongly-connected-components, and graph-shortest-paths • New libraries: (srfi 228), (srfi 233), and (srfi 236) • New documentation for library (lispkit graph)

New features: • New menu item "Show in Finder" to show the current document in the Finder • Display memory footprint in session inspector • Display call stack when errors are shown in sessions • Limit stack size to prevent application crashes • New settings for defining the maximum stack size and the maximum number of active calls to trace upon errors • New procedure in library (lispkit thread): thread-max-stack • Included new libraries: (lisppad draw map) • New sample code: DisplayMap.scm Bug fixes: • Fixed bug leading to deadlocks when using text ports • Fixed bug allowing to execute empty lists • Fixed serious bug leading to an infinite loop when iterating through stack traces

New features: • Performance improvements: optimized code generation for lambdas without captured expressions • Major revamp of all type-related functionality: each type is now represented by a type tag/symbol • Major revision of library (lispkit clos) • Support complex numbers for trigonometric and inverse trigonometric functions in library (lispkit math): sin, cos, tan, asin, acos, and atan • Reimplemented and extended library (lispkit enum) making it compatible with SRFI 209 • New procedures in library (lispkit type): type-for • New procedures in library (lispkit draw): bytevector->image, draw-styled-text, styled-text-size • New procedure in library (lispkit core): procedure-rename • Included new libraries: (lispkit math matrix), (lispkit bitset), (lispkit styled-text), (lispkit draw chart bar), (srfi 118), (srfi 141), (srfi 149), and (srfi 232) • New sample code: ObjectOrientation.scm, DrawBarCharts.scm, and StyledTextDoc.scm Bug fixes: • Bug fixes of indentation with spaces and semicolons • Bug fixes in library (lispkit draw chart bar) and (lispkit enum) • Fixed division by zero issues with truncate and floor procedures • Fixed bug preventing LispPad to correctly determine the maximum number of threads • Optimized display of objects of custom types • Removed duplicates in results of procedures available-fonts and available-font-families in library (lispkit draw) • Changed defaults for procedure string-insert! of library (lispkit string)

New features: • Support for threads • Go-inspired channels for synchronizing threads • Revamp of math libraries, extending functionality, addressing incompatibilities, and fixing bugs: - Consistent interface for procedures random, flrandom, and fxrandom - Unary argument support for fx-, fl-, and fl/ - New procedures make-flonum, flexponent, flsignificand, flnext, flprev, fx-width, fx-greatest, fx-least, fl-epsilon, fl-greatest, and fl-least - Support for many arguments for flmin, flmax, fxmin, fxmax, fx+, fx-, fx*, fx/, fx=, ..., fl+, fl-, fl*, fl/, fl=, ... • New procedures in library (lispkit math util): make-nan, nan-negative?, nan-quiet?, nan-payload, and nan=? • New procedures in library (lispkit system): physical-memory, memory-footprint, and system-uptime • New procedure in library (lispkit port): display* • New procedures in library (lispkit debug): stack-size, call-stack-procedures, call-stack-trace, and set-max-call-stack! • Enabled concurrency support for library (srfi sicp) • Included new libraries: (lispkit thread), (lispkit thread channel), (scheme flonum), (srfi 18), (srfi 144), (srfi 208), (srfi 230) • Exceptions now include more information about the active call stack • Include tutorial for channels as new example code Bug fixes: • Fix several bugs in math libraries: - Prevent crash on division by zero for fx/ - Make procedure exact also work for negative numbers - Improve inexact when used with rationals with very large numerator or denominator • Fix scope of sym in form (let sym ...)

New features: • Integrated simple bytecode optimizer • Implemented support for tagged procedures • Implemented support for procedures with optional arguments • Included new libraries: (lispkit math util), (lispkit math stats), (srfi 166), (srfi 227), and (srfi 229) • Included new documentation for libraries (lispkit prolog), (lispkit math stats), (lispkit math util), (srfi 166), (srfi 227), and (srfi 229) • Ported Peter Norvig's pattern matcher and algebraic simplifier from Common Lisp to Scheme and included it as new example code • Extended sample code Math.scm • Updated PDF library reference manual Bug fixes: • Increased stack size of interpreter • Fixed file/editor loader • Fixed bug compiling every procedure twice • Fixed implementation of procedure expt • Fixed overflow issues in procedure approximate • Fixed crashes in the rounding functions when used with rational big integers • Moved procedure load into library (lispkit core)

New features: - Include all libraries in the library inspector, including libraries that are not loaded - Support filtering in the libraries inspector - New procedures in library (lispkit core): thunk?, procedure-of-arity?, procedure-name, procedure-arity, procedure-arity-range, procedure-arity-includes?, arity-at-least?, arity-at-least-value - Added procedure icloud-directory to library (lisppad system) - Included new libraries: (srfi sicp), (srfi 102), (srfi 217), (srfi 224) - Included new documentation for library (lispkit text-table) - New sample code: Simplifier.scm; extended sample code Math.scm Bug fixes: - Fixed bug in logic to detect valid local definitions - Handle libraries with errors more carefully to prevent crashes - Fixed bit counting bug in library (srfi 143) and expt in (lispkit math)

New features: • New procedures in library (lispkit draw): bitmap->bytevector, bitmap-blur, bitmap-crop • Support tables and definition lists in library (lispkit markdown) • Support gzip and zlib container formats for deflate compression via library (lispkit bytevector) • Support symlink resolution via procedure file-path of library (lispkit system) • Included new libraries: (lisppad location), (lispkit text-table), (srfi 215), (srfi 216), (srfi 219), (srfi 221), (srfi 222), (srfi 223) • Included new sample code EUStats.scm; extended sample code Math.scm • Minor update of the LispPad and LispKit library documentation Bug fixes: • Fixed behavior of "Play" button in editor windows, now setting the source directory correctly • Bug fixes in library (lispkit system): home-directory also supports a non-sandboxed mode, file-path handles tilde correctly • Bug fixes for a few procedures of library (lispkit archive zip) • Bug fix in procedure load (previously, load always returned no result instead of the result of the last executed expression)

New features: • Execute LispPad code on iOS with LispPad Go • Sync LispPad code via iCloud and use it with LispPad Go on iPhones and iPads • Show Markdown document structure in editor windows • Associate descriptions and help text with definitions (in Common Lisp style) • New libraries: (lisppad audio), (lispkit archive zip), (lispkit prolog), (srfi 143), (srfi 189), (srfi 214), (srfi 219), (scheme red), (scheme fixum), (scheme bitwise), (scheme division) • Extended library (lispkit string) with procedures string-decode-named-chars and string-encode-named-chars • Extended library (lispkit char) with procedure char-name • Extended library (lispkit core) with new environment procedures: interaction-environment?, custom-environment?, the-environment, environment-definable?, environment-define, environment-define-syntax, environment-import, environment-documentation, and environment-assign-documentation! • Extended library (lispkit sqlite) with procedures sqlite-database? and sqlite-statement? • Support custom environments for the compile procedure of (lispkit debug) • New sample code: PlayMusic.scm, ObliqueProjection.scm, VisualizePointSets.scm, Schelog.scm Bug fixes: • Allow let* and letrec* to redefine variables • Minor bug fixes in LispKit libraries

New features: • Complete revamp of user interface optimized for macOS Big Sur • Introduced key equivalents for session and editor windows • Rewrote line number display; allow selection of line ranges • Introduced feature to automatically indent Scheme code • Updated and extended documentation (accessible via "Help > LispPad Help" and "Help > LispPad Library Reference") • Included new libraries: (srfi 9), (srfi 180), (srfi 209), (srfi 210) • Extended library (lispkit log) with syntax log-time • Extended library (lispkit debug) with syntax time-values • Extended library (lispkit math) with procedures fxodd?, fxeven?, fx-width, fx-greatest, and fx-least in library (lispkit math); generalized procedure number->string • Included new documentation for library (lispkit debug) • Included new sample code: DrawTrees.scm, DisplayTrees.scm, and EditDistance.scm Bug fixes: • Fixed several editor-related bugs • Fixed crash of virtual machine when execution gets aborted while loading and executing a file • Minor bug fixes in LispKit libraries

New features: • Improved Scheme automatic indentation algorithm • Redesigned Scheme definitions menu in editor windows • Revision of library (lispkit test) involving procedures test-group-failed-tests, test-group-passed-tests, failed-tests, passed-tests, current-test-epsilon • Refactored debugging functionality into library (lispkit debug) • New libraries: (srfi 194), (srfi 204), (lispkit sxml), (lispkit sxml html), and (lispkit sxml xml) • New documentation for libraries: (lispkit iterate), (lispkit comparator), (lispkit match), (lispkit csv), (lispkit log), and (lispkit test) Bug fixes: • Fixed comparison of complex numbers and numbers involving NaN in library (lispkit test) • Fixed small bugs in library (lispkit match) and included support for =.., *.., and **1

New features: • Reorganized menus and shortcuts; improved "Help" menu • Support for marking up identifiers for standard Scheme procedures and special-forms when syntax-highlighting is enabled • Support for auto completions, including setting a custom delay both in console and editor windows • New libraries: (lisppad applescript), (lispkit sqlite), (lispkit combinator), (lispkit system os), (srfi 195), and (srfi 196) • New documentation for libraries: (lispkit combinator), (lispkit stream), (lispkit iterate), (lispkit stack), (lispkit queue), and (lispkit system os) • Renamed library (lispkit iteration) into (lispkit iterate) • Extended library (lispkit date-time) with procedures supporting date arithmetics and comparisons • Extended library (lispkit core) with procedures thunk, thunk*, and apply-with-values • Extended library (lispkit string) with procedures string-normalize-diacritics and string-normalize-separators • Extended library (lispkit dynamic) with procedures unwind-protect and try • Extended library (lispkit control) with procedure letrec-values • Extended library (lispkit system) with procedures home-directory, system-directory, path-extension, append-path-extension, remove-path-extension, file-readable?, file-writeable?, file-deletable?, directory-readable?, directory-writeable?, and directory-deletable? • Extended library (lispkit draw) with procedures set-image-size!, bitmap-size, bitmap-pixels, bitmap-exif-data, and set-bitmap-exif-data! • Support for timeouts in procedures handling HTTP ports in library (lispkit port) • Small tweaks to library (lispkit csv) • Library (lispkit box) now supports multi-value boxes • New sample code: Covid.scm, ComposePhotos.scm Bug fixes: • Speed up output in console windows by 10x • Save command history in session documents • Add "~/Documents/LispPad" as standard search path and search in external libraries and assets always first • Fixed a few path creation functions in library (lispkit system) which failed for corner cases • define-values can now be used wherever define can be used, fixing a long-standing bug • Distinguish between empty response and failed request for HTTP requests in library (lispkit port) • Fixed bugs in PDF library documentation and extended it to cover the new libraries

New features: • Linked documentation for SRFI libraries directly from the libraries info panel of session windows • New example code for rendering markdown documents and for working with polynomials • New libraries: (srfi 6), (srfi 54), (srfi 162) • Extended library (lispkit dynamic) with assertion support: make-assertion-error, assertion, assert • New documentation for libraries (lispkit record), (lispkit regexp), (srfi 6), (srfi 54), (srfi 162) • Made LispPad Library Reference available in PDF form via the Help menu Bug fixes: • Fixed serious memory leak in the compiler and implemented several garbage collection enhancements • Made field access of records type safe

New features: • Library documentation now directly accessible in the "Libraries" tab of session windows • Support for document type-specific text completions • Support logging of garbage collection runs • New mechanism for providing/configuring assets such as images, documents, etc., enabling libraries to depend on data in an extensible fashion • New example code: SpellNumbers.scm, Sudoku.scm, RenderMarkdown.scm; extension of Math.scm • New libraries: (lisppad speech), (lispkit markdown), (lispkit disjoint-set), (srfi 175), (srfi 167), (srfi 98), (srfi 87) • Extended library (lispkit system) with procedures asset-file-path, path-components, parent-path, path, and source-directory • Extended library (lispkit bytevector) with procedures read-binary-file and write-binary-file • Extended library (lispkit string) with procedures write-file, read-file, string-pad-center, string-empty?; string-concatenate now supports an optional separator character • Extended library (lispkit port) with procedures open-input-asset, open-binary-input-asset, call-with-output-bytevector, and call-with-output-string • Extended library (lispkit hashtable) with procedure hashtable-empty-copy; hashtable-hash-function can now return a hash function for all hashtables • Extended library (lispkit math) with procedure fxsqrt • Extended library (lispkit core) with procedure opt • Extended library (lispkit draw) to support assets, color lists and drawing of HTML • Added character set char-set:newlines to (lispkit char-set) • New documentation for libraries (lisppad speech), (lispkit port), (lispkit heap), (lispkit markdown), (lispkit disjoint-set), (srfi 175), (srfi 167), (srfi 98), (srfi 87) Bug fixes: • Fixed bug in library (lispkit set) which was leading to multi-set behavior • Fixed garbage collection issue in library (lispkit hashtable) • Fixed cosmetic issues in the line number viewer of the text editor

New features: • Simplified printed representation of procedures • Provided a more complete set of hash functions via library (lispkit hashtable) • New libraries: (lispkit comparator), (srfi 174), and (srfi 177) • New documentation for libraries (lispkit math) and (lispkit bytevector) Bug fixes: • Replaced garbage collector with a more robust implementation • Fixed several issues in library (lispkit math): integer->fx renamed to integer->fixnum, introduced fxlogical-shift-right and real->flonum, fixed bit-count, fixed fxmodulo to work with negative numbers • Fixed explanations for symbols containing "->"

New features: • Allow logging of input and output of sessions • Support for uninterned symbols • Support for custom keywords in let-keywords • Extension and re-implementation of library (lispkit type) • New libraries: (lispkit stream), (scheme mapping), (srfi 146), (srfi 165), (srfi 173) • Inclusion of miniAdapton in a new third-party directory of LispKit • New example code for generating mazes • Inclusion of documentation for libraries (lispkit control) and (srfi 173) Bug fixes: • Fixed handling of option-clicks to show documentation popovers • Fixed memory leak involving recursive local functions • Implemented algebraic datatypes using more efficient internal functions

New features: • Significant performance improvements in the interpreter • Documentation popovers in session and editor windows (use menu item "View > Explain..." or option-click on symbol) • Documentation viewer in environment sidebar of session windows • New SRFI libraries: SRFI 26, SRFI 33, SRFI 46, SRFI 55, SRFI 146, and SRFI 165 • New libraries: (scheme mapping), (lispkit stream), (lispkit graph) • Included documentation for SRFI 26, SRFI 33, SRFI 46, SRFI 55, SRFI 146, SRFI 161, SRFI 165, (lispkit core), (lispkit list), (lispkit dynamic), (lispkit char), (lispkit char-set), and (lispkit string) Bug fixes: • Bug fixes in library (lispkit gvector) • Fixed memory leak involving recursive local functions

New features: • New libraries: (lispkit csv), (lispkit match), (lispkit regexp), (lispkit gvector), (lispkit date-time) • Extended (lispkit vector) and (lispkit list) libraries • Support for let-keywords and let*-keywords in library (lispkit control) • Support call tracing for individual procedures • Include call traces in the session log • Make the last three session results available via *1, *2, and *3 Bug fixes: • Complete re-write of library import and export logic fixing numerous bugs and incompatibilities with R7RS • Improved reporting of errors in library definitions • Fixed output of multi-value results in the session window • Allow @ as initial character in identifiers

New features: • Session log (for making all log data available in one window) • New libraries: (lisppad log), (lispkit log), (lispkit char-set), (scheme char) • Support for most Scheme libraries from R7RS large/Red edition: (scheme box), (scheme charset), (scheme comparator), (scheme generator), (scheme hash-table), (scheme ideque), (scheme list), (scheme rlist), (scheme set), (scheme sort), (scheme stream), (scheme text), (scheme vector) • New SRFI libraries: SRFI 14 (full + ascii), SRFI 101, SRFI 125 • New functionality in library (lispkit test): support for nested test groups, approximate tests, handling of exceptions • More user-friendly error messages for operating system errors • New example code showcasing LispPad's drawing library • Extended Help menu Bug fixes: • Fixed font handling in session windows • Bug fixes affecting functions fold-left, max, min, numerator, denominator, log, magnitude, gcd, and lcm, as well as the escaping of symbols • Handle closing of ports correctly in library (lispkit port) • Fixed major bug in library (lispkit system) affecting the composition of file paths • Moved from #\dx???? syntax to #\x???? to represent character literals

New features: • Support jumping to a given line number and to the beginning and end of a text document • Included implementation of "Tiny CLOS" as library (lispkit clos) • New SRFI libraries: SRFI 23, SRFI 34, SRFI 39, SRFI 95 • Documentation for libraries (lispkit set) and (lispkit enum) Bug fixes: • The "LispPad Help" menu item still didn't work in version 1.2.2; this is fixed now

Version 1.2.2 is a minor bug fix release which now includes the documentation announced already for version 1.2.1. New features as of version 1.2.1: • Support for dark mode • Support for Markdown syntax highlighting • New preferences pane for customizing colors used in syntax highlighting • Extended library documentation in LispPad's help book • New SRFI libraries: SRFI 11, SRFI 14, SRFI 16, SRFI 51, SRFI 161 • New libraries: (lispkit draw turtle), (lisppad turtle) • New functionality in library (lispkit draw): • New drawing functions • Comprehensive font API • Support for multi-page PDF files Bug fixes as of version 1.2.1: • Revised all hash functions; fixed several hashing-related bugs • Bug fixes in library (lispkit draw)

New features: • Support for dark mode • Support for Markdown syntax highlighting • New preferences pane for customizing colors used in syntax highlighting • Extended library documentation in LispPad's help book • New SRFI libraries: SRFI 11, SRFI 14, SRFI 16, SRFI 51, SRFI 161 • New libraries: (lispkit draw turtle), (lisppad turtle) • New functionality in library (lispkit draw): • New drawing functions • Comprehensive font API • Support for multi-page PDF files Bug fixes: • Revised all hash functions; fixed several hashing-related bugs • Bug fixes in library (lispkit draw)