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Adding pcomplete to eshell

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Howard Abrams 2022-10-25 22:05:47 -07:00
parent dc7ace6e14
commit fa1545b088
1 changed files with 25 additions and 11 deletions
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ha-eshell.org
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@ -52,6 +52,22 @@ If any program wants to pause the output through the =$PAGER= variable, well, we
#+begin_src emacs-lisp
(setenv "PAGER" "cat")
#+end_src
** Argument Completion
Shell completion uses the flexible =pcomplete= mechanism internally, which allows you to program the completions per shell command. To know more, check out this [[https://www.masteringemacs.org/article/pcomplete-context-sensitive-completion-emacs][blog post]], about how to configure =pcomplete= for git commands. The [[https://github.com/JonWaltman/pcmpl-args.el][pcmpl-args]] package extends =pcomplete= with completion support for more commands, like the Fish and other modern shells. I love how a package c→
#+begin_src emacs-lisp
(use-package pcmpl-args)
#+end_src
Note that this will work with =shell-command= as well.
** Better Command Line History
On [[http://www.reddit.com/r/emacs/comments/1zkj2d/advanced_usage_of_eshell/][this discussion]] a little gem for using IDO to search back through the history, instead of =M-R= to prompt for the history.
#+begin_src emacs-lisp
(defun eshell-insert-history ()
"Displays the eshell history to select and insert back into your eshell."
(interactive)
(insert (completing-read "Eshell history: "
(delete-dups
(ring-elements eshell-history-ring)))))
#+END_SRC
* Predicate Filters and Modifiers
The =T= predicate filter allows me to limit file results that have internal =org-mode= tags. For instance, =eshell= will send files that have a =#+TAGS:= header with a =mac= label to the =grep= function:
#+begin_src sh
@ -317,6 +333,10 @@ Specify the buffers with either the Eshell approach, e.g. =#<buffer buffer-name>
(list (get-buffer ha-eshell-ebbflow-buffername))))
#+end_src
I used to call this function, =bcat= (for /buffer cat/), and I sometimes type this:
#+begin_src emacs-lisp
(defalias 'eshell/bcat 'eshell/flow)
#+end_src
*** ebb: Bump Data to a Buffer
We have three separate use-cases:
@ -556,10 +576,14 @@ The [[https://github.com/joddie/pcre2el][pcre2el]] project can convert from a Li
Most shell applications accept Perl Compatible Regular Expressions."
`(rx-let ((integer (1+ digit))
(float (seq integer "." integer))
(b256 (seq (optional (or "1" "2"))
(regexp "[0-9]\\{1,2\\}")))
(ipaddr (seq b256 "." b256 "." b256 "." b256))
(time (seq digit (optional digit) ":" (= 2 digit) (optional ":" (= 2 digit))))
(date (seq (= 2 digit) (or "/" "-") (= 2 digit) (or "/" "-") (= 4 digit)))
(ymd (seq (= 4 digit) (or "/" "-") (= 2 digit) (or "/" "-") (= 2 digit)))
(guid (seq (= 8 hex) "-" (= 3 (seq (= 4 hex) "-")) (= 12 hex))))
(uuid (seq (= 8 hex) "-" (= 3 (seq (= 4 hex) "-")) (= 12 hex)))
(guid (seq uuid)))
(rxt-elisp-to-pcre (rx ,@expressions)))))
#+end_src
** Map
@ -1143,16 +1167,6 @@ This function pulls it all together:
(message "Connecting to: %s" destination)
(eshell-there destination))))
#+end_src
* Better Command Line History
On [[http://www.reddit.com/r/emacs/comments/1zkj2d/advanced_usage_of_eshell/][this discussion]] a little gem for using IDO to search back through the history, instead of =M-R= to prompt for the history.
#+begin_src emacs-lisp
(defun eshell-insert-history ()
"Displays the eshell history to select and insert back into your eshell."
(interactive)
(insert (completing-read "Eshell history: "
(delete-dups
(ring-elements eshell-history-ring)))))
#+END_SRC
* Command on the File Buffer
Sometimes you need to change something about the current file you are editing...like the permissions or even execute it. Hitting =Command-1= will prompt for a shell command string and then append the current file to it and execute it.
#+begin_src emacs-lisp