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#+TITLE: hashline-tools
* CLI tools for [[https://blog.can.ac/2026/02/12/the-harness-problem][Hashline]]
** Included tools
:PROPERTIES:
:header-args: :results verbatim :exports both :eval never-export
:END:
+ hlcat :: A variant of =cat= that prints the hashline before each line
#+begin_src sh
hlcat --help
#+end_src
#+RESULTS:
#+begin_example
usage: hlcat [-h] [--start START] [--end END] [files ...]
Print file with hashline prefixes
positional arguments:
files Files end print (or stdin if none)
options:
-h, --help show this help message and exit
--start, -s START Starting line, inclusive (omit for beginning of file)
--end, -e END Ending line, exclusive (omit for end of file, negatives exclude lines)
#+end_example
+ hlgrep :: A variant of =grep= that prints the hashline before each line
#+begin_src sh
hlgrep --help
#+end_src
#+RESULTS:
#+begin_example
usage: hlgrep [-h] pattern [files ...]
Search for pattern in file with hashline prefixes
positional arguments:
pattern Regex pattern to search for
files Files to search (or stdin if none)
options:
-h, --help show this help message and exit
#+end_example
+ hlpatch :: A hashline-based editing tool
#+begin_src sh
hlpatch --help
#+end_src
#+RESULTS:
#+begin_example
usage: hlpatch [-h] [--inplace INPLACE] {replace,append,prepend,delete} ...
Hashline-based editing tool
positional arguments:
{replace,append,prepend,delete}
replace Replace lines
append Append lines after position
prepend Prepend lines before position
delete Delete lines
options:
-h, --help show this help message and exit
--inplace, -i INPLACE
Write back to file after editing
#+end_example
** Prior implementations
+ [[https://github.com/can1357/oh-my-pi/blob/main/packages/coding-agent/src/patch/hashline.ts][Oh-My-Pi]] (the original implementation, TypeScript)
+ [[https://github.com/dwash96/cecli/blob/main/cecli/helpers/hashline.py][Cecli (formerly Aider-CE)]] (Python)
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