4.3.0 (October 13, 2026)

[tleonhardt]

Overview

This release primarily fixes a number of subtle bugs related to piping cmd2 command output to shell commands. It also removes the experimental tag from the @with_annotated decorator feature.

Details

• Stabilized features
  • @with_annotated is no longer experimental. It was introduced as an experimental feature in
    4.0.0 and is now a fully supported way to define a command's arguments, alongside
    @with_argparser. This covers the decorator and its supporting API in cmd2.annotated,
    including Argument, Option, Group, and ArgumentBlock.
    Annotated Argument Processing.
• Bug Fixes
  • On POSIX, piping a command's output to an interactive program such as less
    (help -v | less) now runs that program as the terminal's foreground job, as a shell pipeline
    does. It had run in a separate session that never received the terminal, so Ctrl-Z and fg
    did not suspend and resume it together with cmd2. The program now owns the terminal as it
    starts, so a pager can set its terminal modes, and Ctrl-C and Ctrl-Z reach the whole pipeline.
    Pipes started from a worker thread, or whose output does not go to the terminal, such as one
    nested in a command whose own output is piped, still run in their own session
  • A shell command piped to an interactive program, such as shell git log | less, now joins
    the pipeline's job, so both processes receive Ctrl-C and Ctrl-Z
  • On Windows, fixed piped output appearing garbled in console programs such as more
    (help -v | more), a regression in 4.2.4. Pipes are written as UTF-8, but console programs
    decode their input with the console's code page. While a pipe or the pager runs, cmd2 now sets
    the console to UTF-8 (code page 65001, as chcp 65001 does) and restores its code pages
    afterward, so console programs and UTF-8 tools such as rg both read the output correctly
  • When copying a command's output to the clipboard (help >) fails, later commands' output is
    no longer written to the temporary file that held it
  • When a pipe's process cannot be started, for instance because no more processes can be created
    or $SHELL names a program that cannot run, both ends of the pipe are now closed rather than
    left open
  • When a pipe's process exits before the command runs, what it wrote, such as the shell's
    "command not found", is no longer lost when cmd2 captures the output, as in a pyscript

---

This discussion was created from the release 4.3.0 (October 13, 2026).