estysdesu

#!/usr/bin/env bash
# https://github.com/estysdesu/dotFiles/blob/master/bin/tmuxColour

for i in {0..255}; do
    printf "\x1b[38;5;${i}mcolour${i}\x1b[0m\n"
done

estysdesu

##### if, elif, else, fi (CONDITIONAL) #####
# https://www.netacad.com/courses/os-it/ndg-linux-essentials --> Ch11: Basic Scripting
if [ "$1" = "hello" ]; then # square brackets are same as test command `test "$1" = "hello"`
  echo "hello yourself"
elif [ "$1" = "goodbye" ]; then
  echo "nice to have met you"
  echo "I hope to see you again"
else
  echo "I didn't understand that"
fi

estysdesu

##### REGEX CHARACTERS/GLOBS #####
. # match any one single character
* # match the previous character repeated 0+ times 
? # match the previous character repeated 0 or 1 time (extended pattern `-E`)
+ # match the previous character repeated 1+ times (extended pattern `-E`)
{<num>} # match the previous character repeated the number of times specificed in the braces (extended pattern `-E`)
[<chars>] # character range to match one time; check `ascii`
[^<chars>] # character range to not match one time; check `ascii`
^ # if first char of pattern, pattern must be at start of line to match
$ # if last char of pattern, pattern must be at end of line to match

estysdesu

##### tr (TRANSLATE/DELETE) #####
# tr <pattern-translate-in> <pattern-translate-out>
# -d: delete SET1
# -t: truncate SET1 to length of SET2
# -c: compliment SET1
# -s: squeeze the repitition SET1
tr 'a-z' 'A-Z' < <file> # converts input to all caps
tr -d ' ' < <file># delete spaces
cat <file> | tr -cd [:digit:] # delete all but digits

estysdesu

##### cat (SHOW ALL FILE CONTENTS) #####
cat <file> # shows all file contents
cat <enter>...<ctrl+d> # echos whatever is typed after enter (useful for redirecting stdin)

##### less/more (PAGERS) #####
less <file> # more advanced version of `more`; allows vim navigation

##### head/tail (PARTIAL CONTENTS) #####
# Normal indexing (GNU/UNIX)
head -n 5 <file> # first 5 lines (defaults to 10) == `head -5 <file>`

estysdesu

##### tar (ARCHIVING) #####
# -z: gzip
# -j: bzip2
# -J: xz
# if compression method is missing, tar tries to guess compression method (from extension)
# -c: create
# -x: extract
# -v: verbose (list each file)
# -f: archive file name
# -r: append to unzipped archive

estysdesu

# https://effbot.org/zone/python-with-statement.htm
class Tyler():
    def __enter__(self):
#         <set-up>
#            return <something> # essentially "with this state thats returned, do something"
    def __exit__(self):
#         <tear-down>
            
with Tyler() as ty:
#     <do-something-with-ty>

estysdesu

##### test OR [ -s/-n/-t/(etc...) ] (TEST CONDITIONALS) #####
# https://www.gnu.org/software/bash/manual/html_node/Bash-Conditional-Expressions.html
# numeric and string are different for numbers -- `test 01 -eq 1` is true, but `test "01" == "1"` is obviously not
# -f: file exists
# -s: file exists and has size > 0
# ! <-flag>: negate 
# -d: directory exists
# -x: can execute 
# <#> -eq <#>: numeric equality; good for exit codes 
# <#> -ne <#>: numeric inequality (test if not equal)

estysdesu

# https://thoughtbot.com/blog/input-output-redirection-in-the-shell
# http://mywiki.wooledge.org/BashSheet#Streams
# http://www.learnlinux.org.za/courses/build/shell-scripting/ch01s04.html

##### fd (FILE DESCRIPTORS) #####
# 0 == stdin
# 1 == stdout
# 2 == stderr
# & == pointer (`2>&1`)
# &> == `2> <file> 1> <file>` (file direction)

estysdesu

#!/usr/bin/env bash
# https://github.com/estysdesu/dotFiles/blob/master/bash/.bash_profile

# one-liner
alias spotify_web="'`locate "*Google\ Chrome"`' --app="https://play.spotify.com"" # Spotify web client without all the junk

# functional
chrome_app=`locate "*Google\ Chrome"`
web_app () {
	"$chrome_app" --app="$1"