Discussion

Bash vs. Python

The Bash implementation was removed with commit 177b4dc.

Bash

• More interesting in terms of doing more with less (cooler as a hack)
• Native support for completion (no extra layer)
• Allows to execute external commands, e.g. tasknote
• Provides control structures for scripting, e.g. for ... (unless shell keywords are rebound, i.e. aliased)
• Easy to use special prompt functions, like __git_ps1
• Easy to integrate user configuration

• More difficult to provide controlled environment
• Not restricted enough, i.e. other commands still executable

Python

• Testable
• Easy to provide controlled environment (only offer subcommands etc.)
• Can be suspended with fg
• Resilient against shortcuts, e.g. info instead of information (taskwarrior), and other special syntaxes, e.g. /pattern/ (taskwarrior)