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Álvaro Ramírez

[2015-04-17 Fri] # Plantuml example

Played with Plantuml. Convenient for generating UML diagrams from text. Language Reference Guide and example below:

  abstract class Singer {
    abstract void sing()
    void Dance()

  Singer <|-- PopSinger
  Singer <|-- LatinSinger

  class PopSinger {
    void sing()

  class LatinSinger {
    void sing()



[2015-04-14 Tue] # Helm-describe-helm-attribute

Writing A Spotify Client in 16 Minutes is fantastic for picking up helm and Emacs lisp tips. Of interest helm-describe-helm-attribute, second to the awesomeness of helm-spotify integration.

[2015-03-06 Fri] # Startup bookmarks

[2015-03-05 Thu] # Learning Emacs lisp

[2015-04-13 Mon] updated
  • Use nreverse and nconc to operate on lists in-place.
  • Set buffer local variables:
(setq-local my-clever-var)
  • Execute before saving buffer:
(add-hook 'write-file-hooks
          (lambda ()
            (message "about to save!")))
  • Possibly use to start processes and send file content:
(make-comint NAME PROGRAM &optional STARTFILE &rest SWITCHES)
  • Creating markers:
(setq my-marker (copy-marker (point)))
  #<marker at 10251 in *ielm*>

(marker-buffer my-marker)
  #<buffer *ielm*>

(marker-position my-marker)
  10251 (#o24013, #x280b, ?⠋)
  • Get org heading at point:
(org-get-heading 'no-tags 'no-todo)
  • Remove string text properties. From manual:

(substring-no-properties STRING &optional FROM TO)

Return a substring of STRING, without text properties. It starts at index FROM and ends before TO. TO may be nil or omitted; then the substring runs to the end of STRING. If FROM is nil or omitted, the substring starts at the beginning of STRING. If FROM or TO is negative, it counts from the end.

  • Skip org entry metadata/drawers:
  • Random access to org entry using id (or CUSTOM_ID):
(org-open-link-from-string "[[#%exciting-custom-id]]")
  • Go to where the function is defined.
  • Press C-u C-M-x. Edebug breakpoint for function.
  • Invoke function in question.
  • n/c will get you around.
  • q when done.
  • Pretty printing objects:
(let ((my-var (list "val1"
  (pp-to-string my-var))
  • Search and/or replace in curent buffer:
(re-search-forward "needle"
                   nil t)
(match-beginning 0) ;; Start location of match from last search.
(match-end 0) ;; End location of match from last search.
(replace-match "love")

;; needle-in-haystack
  • Restric buffer editing to a region:
(narrow-to-region (point)
  • Restore restriction:
(save-restriction (narrow-to-region (point)
  • Restore point, mark, and current buffer:
(save-excursion (goto-char (point-max))
                (insert "Hello elisp."))
  • Concatenating strings:
(concat "Hello " "elisp " "world.")
  • Grabbing thing at point:
(thing-at-point 'word)
(thing-at-point 'symbol)
(thing-at-point 'line)
  • Unit test with ert.
  • Basic iteration with dolist:
(dolist (v '("a" "b" "c"))
  (print v))
  • Output to other buffer:
(with-current-buffer (get-buffer-create "*some buffer*")
  (princ '(some list to print)
  • For a temporary buffer, use with-temp-buffer:
  (insert "abc")
  • Cons cells bookmark.
  • Check for substring:
(string-match-p REGEXP STRING &optional START)
  • Matching substrings and accessing groups:
(setq haystack "Always click [[][here]].")
  "Always click [[][here]]."

(setq needle-re "\\[\\[\\(.*\\)]\\[\\(.*\\)]]")

(string-match needle-re haystack)
  13 (#o15, #xd, ?\C-m)

(match-string 0 haystack)

(match-string 1 haystack)

(match-string 2 haystack)
  • Return argument unchanged (noop):
(identity ARG)
  • Org insert today's timestamp
(org-insert-time-stamp (current-time))
(car LIST)
  • All but first element
(cdr LIST)
  • Add NEWELT to front of PLACE
  • Invoke 'FUNCTION for each in SEQUENCE
  • Search/replace
(while (search-forward "Hello")
  (replace-match "Bonjour"))
  • Save to kill ring = copy.
  • Point = cursor position.
  • Mark = a buffer position.
  • Kill = cut text.
  • Yank = paste.
  • Buffer:File = 1:1.
  • Window:Buffer = 1:1.
  • Frame:Window = 1:many.
  • Font lock = syntax highlighting.

[2014-09-20 Sat] # Emacs lisp bookmarks

[2015-04-12 Sun] # Youtube videos in your org html export

Sacha Chua and John Wiegley posted a wonderful video on Emacs lisp development tips. Embedding the following raw HTML using #+BEGIN_HTML/#+END_HTML:

<iframe width="420"

results in an embedded video when exporting your org file:

[2014-07-13 Sun] # Python bookmarks

[2015-04-12 Sun] updated

[2015-04-12 Sun] # .net bookmarks

[2015-03-06 Fri] # UX scrapbook bookmarks

[2015-04-10 Fri] # UK property bookmarks

[2015-03-06 Fri] # Go bookmarks

[2015-04-09 Thu] # Java bookmarks

[2015-04-09 Thu] # Git commit message style

Adopted Tim Pope's Git commit message style. Also enabled Emacs's git-commit-training-wheels-mode:

(use-package git-commit-training-wheels-mode :ensure t
  :commands (git-commit-training-wheels-mode))

(use-package git-commit-mode :ensure t
  (add-hook 'git-commit-mode-hook 'git-commit-training-wheels-mode)
  :commands (git-commit-mode))

[2015-04-06 Mon] # fci-mode and org-html-export-to-html bug

Having enabled fci-mode in most programing modes, org-html-export-to-html now exports an additional unicode character in source blocks. This thread has a workaround:

(defun org-html-fontify-code (code lang)
  ;; ...
  (funcall lang-mode)
  (when (require 'fill-column-indicator nil 'noerror)
    (fci-mode -1))
  (insert code)
  ;; ...

[2015-03-28 Sat] # Emacs init.el bookmarks

[2015-03-06 Fri] # Lifestyle bookmarks

[2015-04-03 Fri] # Try cocoapods out

Cocapods try:

$ pod try POD_NAME

[2015-03-05 Thu] # iOS bookmarks

[2015-04-03 Fri] # Cornwall travel backlog

[2015-04-03 Fri] # Austria travel backlog

[2015-04-02 Thu] # Cinnamon desktop run dialog

Note to self. Open with Alt-f2.

[2015-03-29 Sun] # Books for 2015

[2014-09-19 Fri] # Emacs bookmarks

[2015-03-29 Sun] updated

[2015-03-28 Sat] # CSS vertical align using flex

Codepen snippet:

  height: 200px;
  background: #ccc;
  display: flex;
  justify-content: center;
  align-items: center;

  margin: auto

[2014-07-14 Mon] # HTML5 bookmarks

[2015-03-26 Thu] # Helm buffer URLs

Venturing into Emacs lisp and Helm. Here's a go at listing all URLs in current buffer.

(require 'goto-addr)

(defun ar/helm-buffer-url-candidates ()
  "Generate helm candidates for all URLs in buffer."
    (goto-char (point-min))
    (let ((helm-candidates '())
      (while (re-search-forward goto-address-url-regexp
                                nil t)
        (setq url
              (buffer-substring-no-properties (match-beginning 0)
                                              (match-end 0)))
        (add-to-list 'helm-candidates
                     (cons url

(defun ar/helm-buffer-urls ()
  "Narrow down and open a URL in buffer."
  (helm :sources `(((name . "Buffer URLs")
                    (candidates . ,(ar/helm-buffer-url-candidates))
                    (action . (lambda (url)
                                (browse-url url)))))))

[2014-07-13 Sun] # Development bookmarks

[2015-03-26 Thu] # London diving schools

[2015-03-05 Thu] # India travel backlog

[2015-03-22 Sun] # Born to Run references

[2015-03-23 Mon] updated

References from reading Christopher McDougall's Born to Run:

Recipe by Megan Mignot, based on book references:

Mama Tita’s Pancakes

  • 1 ½ cups cooked brown rice
  • 1 cup coconut milk
  • 2 ripe bananas
  • 1 tablespoon honey
  • ½ cup white cornmeal
  • 2 teaspoons baking powder

[2015-03-23 Mon] # Doh! undo last git commit

$ git reset --soft HEAD~1

[2015-03-22 Sun] # Resetting variables using defvar

Want to re-evaluate defvars and modify variables? eval-defun (bound to C-M-x) can help. From the manual:

If the current defun is actually a call to `defvar', then reset the variable using its initial value expression even if the variable already has some other value. (Normally `defvar' does not change the variable's value if it already has a value.) Treat `defcustom' similarly.

[2015-03-22 Sun] # Broken Xcode plugins?

Some Xcode plugins stopped loading after updating Xcode. Ensure the latest DVTPlugInCompatibilityUUIDs is added to the plugin's Info.plist. Get from:

$ defaults read \
    /Applications/ DVTPlugInCompatibilityUUID

[2015-03-18 Wed] # Sharing on iOS

NSString *title = @"Sharing on iOS bookmarks.";
NSURL *url = [NSURL URLWithString:@""];
UIImage *image = [UIImage imageNamed:@"beautiful-image"];

UIActivityViewController *controller =
  [[UIActivityViewController alloc]
    initWithActivityItems:@[title, url, image]

// self being a UIViewController.
[self presentViewController:controller animated:YES completion:nil];
  • Sharing through Mail app on simulator isn't supported.

viewServiceDidTerminateWithError: Error Domain=_UIViewServiceInterfaceErrorDomain Code=3 "The operation couldn’t be completed. (_UIViewServiceInterfaceErrorDomain error 3.)" UserInfo=… {Message=Service Connection Interrupted}

[2015-03-19 Thu] # Org tips from 2015-03-18 Emacs hangout

[2015-03-22 Sun] updated

Lots of great tips in Emacs Hangout 2015-03-18. Favorites:

  • Private org drawer to prevent export:
My super duper secret text I don't want to export.
  • C-c C-p/C-c C-n Jump over sections.
  • (setq org-hide-leading-stars t).
  • (org-bullets-mode).
  • (org-refile).
  • C-u (org-refile) jumps, no refile.
  • (helm-org-in-buffer-headings).

[2015-03-19 Thu] # Food bookmarks

[2015-03-19 Thu] # China travel backlog

[2015-03-19 Thu] # Ethiopia travel backlog

[2015-03-18 Wed] # Istanbul travel backlog

[2015-03-18 Wed] # South Korea travel backlog

[2015-03-18 Wed] # San Francisco travel backlog

[2015-03-17 Tue] # Italy travel backlog

[2015-03-17 Tue] # Burma travel backlog

[2015-03-17 Tue] # Emacs lisp debug on entry

Wanted to track down which package was enabling ido-mode on my behalf. debug-on-entry to the rescue. Pass the method name in question and you're good to go.

(debug-on-entry 'ido-mode)

When done, use cancel.

(cancel-debug-on-entry 'ido-mode)

[2015-03-16 Mon] # OS X Screencasts to animated GIF

[2015-03-15 Sun] # Writing Xcode plugins

defaults read \
    /Applications/ DVTPlugInCompatibilityUUID

[2015-03-15 Sun] # Uninstalling Alcatraz from Xcode

$ rm -rf ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins/Alcatraz.xcplugin
$ rm -rf ~/Library/Application\ Support/Alcatraz

ps. Removing all plugins:

$ rm -rf ~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins/*

[2015-03-14 Sat] # Prefill Emacs swiper with current region

The new swiper Emacs package is proving to be a great alternative to helm-swoop. Here's how to prefill with current region:

(defun ar/prefilled-swiper ()
  "Pre-fill swiper input with region."
  (if (region-active-p)
      (let ((region-text (buffer-substring (region-beginning)
        (swiper region-text))

(global-set-key (kbd "C-s")

[2015-03-14 Sat] # Change Mac OS app icon

  • Open the new icon (.icns) in Preview.
  • Select all (⌘-a).
  • Copy (⌘-c).
  • Ctrl-click on app icon.
  • Select Get Info.
  • Click on app icon (top-left).
  • Paste (⌘-v).
  • Done!



[2015-03-11 Wed] # Hack on Emacs London meetup bookmarks

[2015-03-09 Mon] # Working with OS X and Emacs tips

From M-x all-things-emacs, Ryan McGeary's OS X/Emacs workflow.


[2015-03-09 Mon] # Building ycmd


$ git clone
$ cd ycmd
$ git submodule update --init --recursive
$ ./ --clang-completer


$ python ycmd
  serving on

[2015-03-08 Sun] # Paris travel backlog

  • Au Passage. Small plates in fun atmosphere.
  • Berthillon Ice Cream.
  • Buvette Gastrotheque. Wine bar with small dishes.
  • Cheri Bibi, possibly hipster, underneath Sacre Coeur, good cocktails.
  • Creperie Josseline. Worth the queue. Drink Breton cider with crepes.
  • Holybelly Canal Saint Martin.
  • L'Aller Retour. The place for steak-frites.
  • L'Office. Wine bar/bistrot.
  • Le Barav'.
  • Marché d'Aligre. Authentic neighbourhood market.
  • Marché des Enfants Rouge. Small covered market. Eat at food stalls.
  • Mosquee de Paris. City mosque. Drink mint tea at courtyard under olive trees or eat in restaurant inside. North African food.
  • Musee d'Orsay.
  • Paris: A Guide To Some Of The Best Cafes In Canal St. Martin.
  • Pierre Herme. For great pastries and macarons.
  • RATP for transport info including the "carnet" of 10 tickets.
  • Rodin Museum.

[2015-03-08 Sun] # Org mode bookmarks

[2015-03-08 Sun] # Regular bookmarks

[2015-03-08 Sun] # Photography bookmarks

[2015-03-07 Sat] # Music backlog

[2015-03-07 Sat] # UX bookmarks

[2015-03-06 Fri] # Graphics bookmarks

[2015-03-29 Sun] # Ayahuasca bookmarks

[2015-03-06 Fri] # Productivity bookmarks

[2015-03-06 Fri] # Courses bookmarks

[2015-03-06 Fri] # Mindfulness bookmarks

[2015-03-06 Fri] # Privacy bookmarks

[2015-03-06 Fri] # Romania travel backlog

[2015-03-06 Fri] # Travel bookmarks

[2015-03-06 Fri] # GitHub

[2015-03-06 Fri] # iOS imaging bookmarks

[2015-03-05 Thu] # Reload inputrc

Reload .iputrc from bash prompt: C-x C-r. More at bashref manual.

[2015-03-07 Sat] # Unix/Linux tips backlog

rsync --rsync-path=/usr/local/bin/rsync --partial \
    --progress --rsh=ssh john@host:/path/to/file path/to/partial/file

[2015-03-04 Wed] # Language learning bookmarks

[2015-03-08 Sun] # London food backlog





  • BAO (Bao buns! enough said).

Sloane Square


[2015-02-18 Wed] # Git conflict resolution Déjà vu?

Use git rerere. Here's a post.

[2015-01-17 Sat] # Graphics design tools

[2014-12-30 Tue] # Books backlog

[2015-03-07 Sat] # Recipes

Tom Kha Gai soup

  • Chicken or Prawns
  • 2 kaffir lime leaves
  • 1 lemongrass stalk
  • 1 1/2 cocunut milk
  • 3/4 sliced fresh galaghal
  • 1 1/2 chicken stock or water
  • 1/2 cup mushrooms
  • 3 1/2 tbsp sugar
  • 1/2 cup of cilantro
  • 1-4 thai chillies
  • 1-2 tbsp chili oil
  • 1 green onion

Veg-Fruit juice

  • Lime
  • Ginger
  • Apple
  • Chilly
  • Celery
  • Fig
  • Blueberries

Berry Hempster

  • Hemp milk
  • Hemp protein
  • Strawberry
  • Blueberry
  • Date

[2014-12-30 Tue] # Travel gear

[2014-12-30 Tue] # Movie backlog

  • Akira Kurosawa director.
  • Awake, The Life of Yogananda.
  • Babadook.
  • Birdmane.
  • Boyhood.
  • Enter the Void, by Gaspar Noe
  • Hirokazu Koreeda director.
  • Naomi Kawaze director.
  • Nostalghia
  • Sion Sono director.
  • Solyaris
  • Stalker
  • Takashi Kitano director.
  • Takashi Miike director.
  • The Connection.
  • The Mirror
  • Uncle Boonmee Who Can Recall His Past Lives, by Apichatpong Weerasethakul.
  • Waking Life, by Rickard Linklater.

[2014-12-30 Tue] # Video backlog

TODO Griefwalker.

[2014-12-29 Mon] # Spotted

[2014-12-03 Wed] # Emacs tips backlog

Avoid writing pitfalls using artbollocks-mode and writegood

More at Sacha's post.

Create presentations in org and export via org-ioslide.

Yasnippet mirrors with transformations

For example:

- (${1:id})${2:foo}
    return $2;

- (void)set${2:$(capitalize yas-text)}:($1)aValue
    [$2 autorelease];
    $2 = [aValue retain];

More at snippet development.

installing Emacs 24.4 on Mac OS

See Yamamoto's Mac port.

$ brew tap railwaycat/emacsmacport
$ brew install emacs-mac

Graphical system monitor

See Symon.


elmacro shows keyboard macros or latest interactive commands as emacs lisp.

Weather package

Monitor clipboard and automatically paste to buffer

See clipmon.

Try out stock-ticker

Try out ibuffer-vc

Sort python imports

See pyimpsort.

Private configuration

See private package.

Unify mechanism to open files

Export ASCII art

With Artist mode + ditaa for UML. Demo video.

Speed up window handling

See ace-window.

Mac OS clipboard support (from terminal)

See pbcopy.


See speedtype.

Building Emacs 24.4 on Linux

sudo apt-get install texinfo build-essential xorg-dev libgtk-3-dev libjpeg-dev libncurses5-dev libgif-dev libtiff-dev libm17n-dev libpng12-dev librsvg2-dev libotf-dev ./configure –with-gtk –prefix=/your/fav/prefix

Jumping around tips

See zerokspot.

use-package post

At lunaryorn.

Static blog

See org-page.

youtube-dl for Emacs

See Or emacs.

Clang indexing tool

See clang-tags.

Project management for C/C++

See Malinka.

Git modes

See git-modes.

Lots of org links

Found at

Create custom theme

See Trường's post.

GTD Emacs workflow

See Charles Cave's notes.

Simplify file transformations

See make-it-so.

LISP editing

See lispy.

Continue comment blocks

M-j (indent-new-comment-line).

O(1) link jump

See ace-link.

Choosing magit repo

C-u C-x g (magit-status).

Project templates

See Skeletor.

Melpa recipe format

See format.

NaturalDocs for JavaScript in Emacs


Checks buffer for doc strings file errors.

Toggling key bingings

Squashing Commits with Magit

See post.

Editing colors

See Kurecolor.

Hide lines longer than

Export org to reveal.js

See Org-Reveal.

Beautify org

org-beautify-theme: A sub-theme to make org-mode more beautiful.

Minimalist appearance

See minimal.

Want buffer local cursor color?

See ccc.

Narrowing regions

  • C-x n n (narrow-to-region).
  • C-x n w (widen).

Linux system-wide Emacs keybindings

Org Protocol

Editing XML?

Try out nxml-mode.

Move by parens

For example, C-M-u moves backward out of one level of parentheses. More at the manual.

Debug expanded elisp macros

See Wisdom and Wonder's post.

Working with Java

Describe bindings

  • C-h b lists all bindings.
  • Narrow down with occurr or Helm!

Shell commands

  • C-u M-! (inline shell-command).
  • C-u M-| (shell-command-on-region).

Search manuals

  • info-apropos (lookup subject in all manuals).
  • emacs-index-search (lookup subject in Emacs manual).

Recursive query/replace

  • M-x find-dired RET.
  • Navigate to location, RET.
  • Add find argument (omit for all files), RET.
  • t (select all).
  • Q (query-replace).
  • Enter search/replace terms.
  • y/n for each match.
  • C-x s ! (save all).

Disable furniture

(menu-bar-mode -1)
(toggle-scroll-bar -1)
(tool-bar-mode -1)

Repeat last command

C-x z (and just z threreafter).

Replace char with a newline

  • M-x replace-string RET ; RET C-q C-j.
  • C-q (quoted-insert).
  • C-j (newline).

[2014-11-02 Sun] # Xcode6 tips


  • ⌘⇧o Fuzzy file search.
  • ⌘⌥j Fuzzy file search (showing in Xcode project hierarchy).
  • ⌘⇧j Show file in Xcode project hierarchy.
  • ⌘⌥0 Show/hide utility area (right panel).
  • ⌘0 Show/hide navigation area (left panel).
  • ⇧⌘Y Show/hide debug area (bottom panel).
  • Ctrli Indent selection.
  • ⌘\ Toggle breakpoint on line.
  • ⌘/ Toggle comment.
  • ⌘[1-8] Select tabs on left panel.
  • Ctrl[1-x] Select top file navigation menu items.

Xcode features

  • Snippets.
  • Templates.
  • View debugging.
  • Simctl (send files to simulator).

Plugins of interest

  • Fuzzy autocomplete.
  • Uncrustify for indentation.
  • xcs code switch expansion.
  • Org and order (for properties).

[2014-09-11 Thu] # Resetting gnome-terminal preferences

Resetting preferences

gconftool --recursive-unset /apps/gnome-terminal

Want 256 colors?

Edit .bash_profile

export TERM="screen-256color"

Ensure .bash_profile is loaded

From gnome-terminal window:

        Title and Command
          X Run command as login shell


Bonus: See post to get solarized on gnome-terminal.

[2015-03-05 Thu] # Git bookmarks

[2014-07-14 Mon] # Java bookmarks

  • Lanterna, a text GUI (a la ncurses) written in Java.

[2013-11-04 Mon] # Some python idioms

  • Prefer double quotes if escaping single quotes.
  • Prefer string interpolation over join. Eg. "'%s'" % member_default.
  • Prefer double underscore for privates.
  • Prefer with statement to implicitly close file.
with open(path, 'r') as text_file:
    text =
  • Prefer list comprehensions to filter.
  • Prefer using separate modules over classes if only using for separation.
  • Keep in mind: "eafp vs lbyl" (ie. just let it throw).
  • Prefer exceptions over assertions.
  • Throw ValueError for wrong input.
  • Return explicit False if remaining case is always false.