adworse

defmodule StringTrimmer do
  def trim_utf8(string, len), do: trim(string, len, &utf8_counter/1)

  def trim_utf16(string, len), do: trim(string, len, &utf16_counter/1)

  def trim(string, len, counter) do
    string
    |> String.graphemes()
    |> Enum.reduce_while({0, ""}, fn grapheme, {count, acc} ->
      count = count + counter.(grapheme)

adworse

def counter(string) do
  string
  |> :unicode.characters_to_binary(:utf8, :utf16)
  |> byte_size()
  |> div(2)
end

adworse

iex> name = "समुद्र के भीतर अचानक जब बड़ी तेज़ हलचल होने लगती है तो उसमें तूफान उठता है जिससे ऐसी लंबी और बहुत ऊंची लहरों का रेला उठना शुरू हो जाता"\
|> Naive.trim_name
"समुद्र के भीतर अचानक जब बड़ी तेज़ हलचल होने लगती है तो उसमें तूफान उठता है जिससे ऐसी लंबी और बहुत ऊंची लहरों का"

iex> name |> String.length
80

iex> Repo.insert(%Company{name: name})
** (Postgrex.Error) ERROR 22001 (string_data_right_truncation) value
    too long for type character varying(80)

adworse

% node
Welcome to Node.js v14.5.0.
Type ".help" for more information.
> "Sunny! 𐍈𐍈 Yesterday my life was filled with rain, \
... Oh Sunny 𐍈𐍈You smiled at me re".length
84

adworse

iex> trimmed = "Sunny! 𐍈𐍈 Yesterday my life was filled with rain, \
Oh Sunny 𐍈𐍈You smiled at me really eased the pain"  \
|> LessNaive.trim_string
"Sunny! 𐍈𐍈 Yesterday my life was filled with rain, Oh Sunny 𐍈𐍈You smiled at me re"

iex> trimmed |> String.length
80

adworse

defmodule LessNaive do
  def trim_string(string) do
    string
    |> String.graphemes()
    |> Enum.reduce_while({0, ""}, fn grapheme, {count, acc} ->
      count = count + counter(grapheme)

      if count <= 80,
        do: {:cont, {count, acc <> grapheme}},
        else: {:halt, acc}

adworse

defmodule LessNaive do
  def trim_string(string) do
    string
    |> String.graphemes()
    |> Enum.reduce_while("", fn grapheme, acc ->
      if counter(acc <> grapheme) <= 80,
        do: {:cont, acc <> grapheme},
        else: {:halt, acc}
    end)
  end

adworse

defmodule Naive do
  def trim_name do
    name
    |> String.codepoints
    |> Enum.take(80)
    |> to_string
  end
end

iex> Repo.insert(%Company{name: name |> Naive.trim_name})

adworse

defmodule Naive do
  def trim_name(name) do
    name |> String.slice(0, 80)
  end
end

adworse

Show git branch and ruby version in bash prompt

export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8

parse_git_branch() {
     git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/[\1]/'
}