Text
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Terminal Editors
For
Ruby Core Toolchain
ITOYANAGI Sakura
RubyKaigi 2019 Fukuoka
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Greeting
Hello, everyone!
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Greeting
Welcome to Fukuoka, Japan!
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Let me introduce myself
I'm
a RDoc maintainer
a Ruby committer
a member of Ruby core
team
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Let me introduce myself
I'm so tired because this is
first session just after keynote.
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Let me introduce myself
Dark green area is Kyushu
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Let me introduce myself
RubyKaigi venue is Fukuoka
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Let me introduce myself
I was born at Nagasaki
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Let me introduce myself
How strange shape the arrows are
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Let me introduce myself
Both are almost the same culture
area
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Let me introduce myself
Both eat tonkotsu ramen
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Let me introduce myself
Black Mont Blanc
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Let me introduce myself
This is the greatest soul food of
Kyushu people
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Let me introduce myself
White ice cream is covered black
chocolate and crunchy chips in
perfect balance
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Let me introduce myself
All children in Kyushu are raised
on Black Mont Blanc and
everyone love it, Black Mont
Blanc is nice so Kyushu is nice
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Community: Asakusa.rb
Asakusa.rb is holding every
Ruby Tuesday
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Community: Asakusa.rb
Many speakers of RubyKaigi
2019 are from Asakusa.rb
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Company:
Space Pirates, LLC.
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Company:
Space Pirates, LLC.
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Company:
Space Pirates, LLC.
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Hobby: climbing
And, my hobby is climbing.
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Hobby: climbing
I always go climbing when
Ruby conferences.
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Hobby: climbing
But I got an injured TFCC by hard training
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Hobby: climbing
Camp in a gorge at last weekend
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Hobby: climbing
It's a prosthetic finger for climbing
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Hobby: climbing
Climbing with prosthetic finger
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Hobby: climbing
Camp in a gorge at last weekend
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Hobby: climbing
Camp in a gorge at last weekend
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Hobby: climbing
This type of injury has so hard
problem, it's "I can't turn my
humerus".
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Hobby: climbing
It's natural position of humerus
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Hobby: climbing
It's typing position of humerus
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Hobby: climbing
"I can't turn my humerus"
vs
Typing position with turning
my humerus
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Hobby: climbing
I'm still getting over the injury
and I've gotten a lot better
now.
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Hobby: climbing
But I couldn't turn my
humerus in the early days. It
is effectively sentencing a
programmer to death.
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Hobby: climbing
In the severe situation, I felt I
had to choose.
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Hobby: climbing
I should:
make a keyboard
make an editor
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Hobby: climbing
I should:
make a keyboard
make an editor
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Terminal
Editors
For
Ruby Core
Toolchain
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Terminal Editors
For Ruby Core Toolchain
First, I got...
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Terminal Editors
For Ruby Core Toolchain
TFCC injury
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GNU Readline
Ruby has one big problem
when installing, it's about GNU
Readline.
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GNU Readline
GNU Readline is a line editor
software. For example, you
always use it on shell.
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GNU Readline
Ruby has readline standard
library, and it's based on GNU
Readline as a native library.
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GNU Readline
If you build and install Ruby
without installing GNU
Readline as a linkable files:
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GNU Readline
readline stdlib is nothing
Only "input" and
"backspace" are available
on IRB
Pry fails to launch
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GNU Readline
It's a very sad situation and a
hard trap for beginners.
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GNU Readline
And user including me needs
to re-build Ruby, it means I
need to type keyboard more.
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GNU Readline
It's worst case for my wrist
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GNU Readline
So I started to develop a GNU
Readline compatible library by
pure Ruby for Ruby core.
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GNU Readline
I had a plan to explain
terminal technologies in this
session but now...
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GNU Readline
Now, an unprecedented boom in
text editor.
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GNU Readline
You can listen to terminal
techniques in this session
tomorrow.
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GNU Readline
I developed Reline what is as
a GNU Readline
(almost)compatible library by
pure Ruby.
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GNU Readline
Reline's development policies
are:
complete developing as
soon as possible
because GNU Readline has
insanely many features
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GNU Readline
Reline's development policies
are:
Windows support by Win32
API
because it's best way to
support Windows
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GNU Readline
Therefore Reline uses:
ANSI escape code on Unix
like OSs
Win32 API on Windows
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GNU Readline
Therefore Reline uses:
ANSI escape code on
Unix like OSs
Win32 API on Windows
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ANSI escape code
ANSI escape code is a
standard specification to
control the cursor location,
color, and other options on
terminal.
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ANSI escape code
If a terminal supports ANSI
escape code, softwares control
unified escape code.
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ANSI escape code
Example:
puts
puts
puts
"\e[31mred"
"\e[32mgreen"
"\e[34mblue"
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ANSI escape code
Example:
puts "\e[31m"
puts "\e[32m"
puts "\e[34m"
+ "red"
+ "green"
+ "blue"
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ANSI escape code
Example:
puts
puts
puts
#
"\e[31m"
"\e[32m"
"\e[34m"
^color spec
+ "red"
+ "green"
+ "blue"
^text
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ANSI escape code
Output should be like this
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ANSI escape code
Example:
print "\e[#{num}A"
# Cursor Up
print "\e[#{num}B"
# Cursor Down
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ANSI escape code
Example:
print "\e[2K"
# Erase in Line
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ANSI escape code
But ANSI escape code has
some problems:
there aren't many things to
be able do
some escape sequences
are very slow grievously
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ANSI escape code
For example,
print "\e[6n"
# Device Status Report
is very slow.
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ANSI escape code
If software uses Device Status
Report so many times, it
should slower by the by.
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ANSI escape code
So terminal software with
ANSI escape code should be
devised within limited
operations.
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GNU Readline
Reline uses:
ANSI escape code on Unix
like OSs
Win32 API on Windows
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Win32 API
Fiddle what is for calling
functions inside .dll or .so
dynamic libraries is only one
solution for supporting Win32
API.
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Win32 API
This is "Console Functions"
page URL of Win32 API.
↓↓↓
https://docs.microsoft.com/en-us/windows/console/console-functions
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Win32 API
"Console Functions" is enough
to do that the same of ANSI
escape code.
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Win32 API
GetStdHandle() for console handle
SetConsoleCursorPosition() is
for cursor up and down
GetConsoleScreenBufferInfo() is
for cursor position
blah blah blah
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Hard work
It was so hard work to
complete.
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Hard work
So I always do programming,
on a desk, on a bed, in trains,
in a bathroom, in a toilet...
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Hard work
Sometimes I use computer on the floor
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Hard work
I got right anterior cruciate ligament injury
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Hard work
I got right anterior cruciate ligament injury
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Unicode support
Multibyte characters of
Unicode has so complex
specifications:
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Unicode support
combination plural bytes to one character
combination plural characters to one
grapheme cluster
character width depending on the
situation
blah blah blah
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Unicode support
combination plural bytes to one
character
combination plural characters to one
grapheme cluster
character width depending on the
situation
blah blah blah
I'll omit to explain these 2
specs because of too complex.
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Unicode support
combination plural bytes to one character
combination plural characters to one
grapheme cluster
character width depending on the
situation
blah blah blah
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Unicode support
Some Unicode characters'
width are changed by the
situation, for example Cyrillic
alphabet.
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Unicode support
I'll show 2 gnome-terminal
screenshot.
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Unicode support
"Д" as a single width character
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Unicode support
"Д" as a double width character
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Unicode support
Both are the same strings, but
changed width of "Д"
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Unicode support
The behaviour is based on
terminal software settings
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Unicode support
How to resolve:
show in actuality and check
width and...
delete it before user
awakes, in an eye's blink
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Unicode support
Vim has a function,
may_req_ambiguous_char_width() ,
the comment of it says...
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Unicode support
First, we move the cursor to (1, 0)
and print a test ambiguous character
\u25bd (WHITE DOWN-POINTING TRIANGLE)
and query current cursor position.
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COOLEST
TECH
IN
2019
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Unicode support
New headache comes, it's killing me
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Unicode support
I ported it to Reline. Coolest
software.
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Line editing implementation
Next, let me implement line
editing features to Reline.
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Line editing implementation
These are key assigned
operations...
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Line editing implementation
operation method list
ed_insert(key)
ed_quoted_insert(str, arg: 1)
ed_next_char(key, arg: 1)
ed_prev_char(key, arg: 1)
ed_move_to_beg(key)
ed_move_to_end(key)
ed_prev_history(key, arg: 1)
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Line editing implementation
Oh, list is cut off in the
middle...
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Line editing implementation
operation method list(smaller)
ed_insert(key)
ed_quoted_insert(str, arg: 1)
ed_next_char(key, arg: 1)
ed_prev_char(key, arg: 1)
ed_move_to_beg(key)
ed_move_to_end(key)
ed_prev_history(key, arg: 1)
ed_next_history(key, arg: 1)
ed_newline(key)
em_delete_prev_char(key)
ed_kill_line(key)
em_kill_line(key)
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Line editing implementation
Ah...
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Line editing implementation
operation method list(smallest)
ed_insert(key)
ed_quoted_insert(str, arg: 1)
ed_next_char(key, arg: 1)
ed_prev_char(key, arg: 1)
ed_move_to_beg(key)
ed_move_to_end(key)
ed_prev_history(key, arg: 1)
ed_next_history(key, arg: 1)
ed_newline(key)
em_delete_prev_char(key)
ed_kill_line(key)
em_kill_line(key)
em_delete_or_list(key)
em_yank(key)
em_yank_pop(key)
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Line editing implementation
Too many
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Line editing implementation
operation method list
(smallester)
ed_insert(key)
ed_quoted_insert(str, arg: 1)
ed_next_char(key, arg: 1)
ed_prev_char(key, arg: 1)
ed_move_to_beg(key)
ed_move_to_end(key)
ed_prev_history(key, arg: 1)
ed_next_history(key, arg: 1)
ed_newline(key)
em_delete_prev_char(key)
ed_kill_line(key)
em_kill_line(key)
em_delete_or_list(key)
em_yank(key)
em_yank_pop(key)
ed_clear_screen(key)
em_next_word(key)
ed_prev_word(key)
em_delete_next_word(key)
ed_delete_prev_word(key)
ed_transpose_chars(key)
em_capitol_case(key)
em_lower_case(key)
em_upper_case(key)
em_kill_region(key)
copy_for_vi(text)
vi_insert(key)
vi_add(key)
vi_command_mode(key)
vi_next_word(key, arg: 1)
vi_prev_word(key, arg: 1)
vi_end_word(key, arg: 1)
vi_next_big_word(key, arg: 1)
vi_prev_big_word(key, arg: 1)
vi_end_big_word(key, arg: 1)
vi_delete_prev_char(key)
ed_delete_prev_char(key, arg: 1)
vi_zero(key)
vi_change_meta(key)
vi_delete_meta(key)
vi_yank(key)
vi_list_or_eof(key)
ed_delete_next_char(key, arg: 1)
vi_to_history_line(key)
vi_histedit(key)
vi_paste_prev(key, arg: 1)
vi_paste_next(key, arg: 1)
ed_argument_digit(key)
vi_to_column(key, arg: 0)
vi_next_char(key, arg: 1)
search_next_char(key, arg)
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Line editing implementation
GNU Readline features are:
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Line editing implementation
emacs mode
kill-ring
yank, yank-pop
vi mode
argumented operations
combination of operation and motion
undo
setting files
key binding
macro
blah blah blah
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It means
that I made
almost full
2 editors
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Line editing implementation
Demonstration
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Multiline
editor
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Multiline editor
Today's description of this
session explains about
"Reidline".
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Multiline editor
"Reidline" is authored for new IRB by keiju-san who
is Ruby's grandfather, it behaves as a multiline editor
like JavaScript console on browsers.
It had many technical problems but I've already solved
that when I implemented Reline.
So I helped to complete Reidline.
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Multiline editor
Therefore, I improved Reline
for Reidline. It supports
multiline a few days ago!
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Multiline editor
Stiffness of neck, shoulder, lower back
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Multiline editor
There are 3 editors by Ruby
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Multiline editor
And, I'm the current RDoc
maintainer. So I added new
feature that shows document
after completion.
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Multiline editor
Demonstration
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Multiline editor
I started development of
editor for my wrist, but crash
of my body is continued.
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Multiline editor
Incredible situation.
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Multiline editor
And, at 3rd day of RubyKaigi,
Ruby 2.7.0-preview1 will be
released, with Reline and
Reidline.
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Multiline editor
So I should fix all bugs for the
day.
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Multiline editor
My body will be gone
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Multiline editor
This is my last work of Heisei era
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Multiline editor
C'mon, Reiwa era...
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