Refactor Alacritty scripts

This includes some changes to the scripts `README.md` to provide
some more information on the different Alacritty scripts.

A new script for testing the 24 bit support of Alacritty has been
added with the `24-bit-color.sh` name. This should help with
troubleshooting truecolor support issues.

Since `perf` is a standard tool which is available in the official
repositories for most distributions, it doesn't make much sense to
provide an installation script specifically for Ubuntu. As a result of
this, the script has been removed.

5 files changed, 156 insertions, 30 deletions

diff --git a/scripts/24-bit-color.sh b/scripts/24-bit-color.sh
new file mode 100755
index 00000000..161608fc
--- /dev/null
+++ b/scripts/24-bit-color.sh
@@ -0,0 +1,101 @@
+#!/bin/bash
+# This file was originally taken from iterm2 https://github.com/gnachman/iTerm2/blob/master/tests/24-bit-color.sh
+#
+#   This file echoes a bunch of 24-bit color codes
+#   to the terminal to demonstrate its functionality.
+#   The foreground escape sequence is ^[38;2;<r>;<g>;<b>m
+#   The background escape sequence is ^[48;2;<r>;<g>;<b>m
+#   <r> <g> <b> range from 0 to 255 inclusive.
+#   The escape sequence ^[0m returns output to default
+
+setBackgroundColor()
+{
+    #printf '\x1bPtmux;\x1b\x1b[48;2;%s;%s;%sm' $1 $2 $3
+    printf '\x1b[48;2;%s;%s;%sm' $1 $2 $3
+}
+
+resetOutput()
+{
+    echo -en "\x1b[0m\n"
+}
+
+# Gives a color $1/255 % along HSV
+# Who knows what happens when $1 is outside 0-255
+# Echoes "$red $green $blue" where
+# $red $green and $blue are integers
+# ranging between 0 and 255 inclusive
+rainbowColor()
+{
+    let h=$1/43
+    let f=$1-43*$h
+    let t=$f*255/43
+    let q=255-t
+
+    if [ $h -eq 0 ]
+    then
+        echo "255 $t 0"
+    elif [ $h -eq 1 ]
+    then
+        echo "$q 255 0"
+    elif [ $h -eq 2 ]
+    then
+        echo "0 255 $t"
+    elif [ $h -eq 3 ]
+    then
+        echo "0 $q 255"
+    elif [ $h -eq 4 ]
+    then
+        echo "$t 0 255"
+    elif [ $h -eq 5 ]
+    then
+        echo "255 0 $q"
+    else
+        # execution should never reach here
+        echo "0 0 0"
+    fi
+}
+
+for i in `seq 0 127`; do
+    setBackgroundColor $i 0 0
+    echo -en " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor $i 0 0
+    echo -en " "
+done
+resetOutput
+
+for i in `seq 0 127`; do
+    setBackgroundColor 0 $i 0
+    echo -n " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor 0 $i 0
+    echo -n " "
+done
+resetOutput
+
+for i in `seq 0 127`; do
+    setBackgroundColor 0 0 $i
+    echo -n " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor 0 0 $i
+    echo -n " "
+done
+resetOutput
+
+for i in `seq 0 127`; do
+    setBackgroundColor `rainbowColor $i`
+    echo -n " "
+done
+resetOutput
+for i in `seq 255 -1 128`; do
+    setBackgroundColor `rainbowColor $i`
+    echo -n " "
+done
+resetOutput
+
diff --git a/scripts/README.md b/scripts/README.md
index 39897c30..a560b3b6 100644
--- a/scripts/README.md
+++ b/scripts/README.md
@@ -1,20 +1,26 @@
-scripts
+Scripts
 =======
 
-There are two scripts included at the time this README was written, and they
-both support flamegraph generation on Ubuntu. The first script installs the
-required dependencies:
+## Flamegraph
+
+Run the release version of Alacritty while recording call stacks. After the
+Alacritty process exits, a flamegraph will be generated and it's URI printed
+as the only output to STDOUT.
 
 ```sh
-scripts/ubuntu-install-perf.sh
+./create-flamegraph.sh
 ```
 
-The second script will run Alacritty while recording call stacks. After the
-Alacritty process exits, a flamegraph will be generated  and its URI printed.
+Running this script depends on an installation of `perf`.
+
+## ANSI Color Tests
+
+We include a few scripts for testing the color of text inside a terminal. The
+first shows various foreground and background varients. The second enumerates
+all the colors of a standard terminal. The third enumerates the 24-bit colors.
 
 ```sh
-scripts/create-flamegraph.sh
+./fg-bg.sh
+./colors.sh
+./24-bit-colors.sh
 ```
-
-**NOTE**: The _create-flamegraph.sh_ script is intended to be run from the
-alacritty project root.
diff --git a/scripts/colors.sh b/scripts/colors.sh
new file mode 100755
index 00000000..436d149e
--- /dev/null
+++ b/scripts/colors.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+for x in {0..8}; do
+    for i in {30..37}; do
+        for a in {40..47}; do
+            echo -ne "\e[$x;$i;$a""m\\\e[$x;$i;$a""m\e[0;37;40m "
+        done
+        echo
+    done
+done
+echo ""
diff --git a/scripts/create-flamegraph.sh b/scripts/create-flamegraph.sh
index 8c03aa28..71af6a93 100755
--- a/scripts/create-flamegraph.sh
+++ b/scripts/create-flamegraph.sh
@@ -1,19 +1,38 @@
 #!/usr/bin/env bash
 
-# Make sure FlameGraph scripts are available
-if [ ! -e ./FlameGraph ]
+# The full path to the script directory, regardless of pwd.
+DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+
+# Current UNIX time.
+TIME=$(date +%s)
+
+# Make sure FlameGraph scripts are available.
+if [ ! -e $DIR/FlameGraph ]
 then
-    git clone https://github.com/BrendanGregg/FlameGraph
+    git clone https://github.com/BrendanGregg/FlameGraph \
+        $DIR/create-flamegraph/FlameGraph
 fi
 
-if [ ! -e target/release/alacritty ]
+# Make sure a release build of Alacritty is available.
+if [ ! -e $DIR/../target/release/alacritty ]
 then
     echo "Must build alacritty first: cargo build --release"
     exit 1
 fi
 
-# This will block while alacritty runs
-perf record -g -F 99 target/release/alacritty
-perf script | ./FlameGraph/stackcollapse-perf.pl | ./FlameGraph/flamegraph.pl --width 1920 > alacritty.svg
+# Make sure perf is available.
+if [ ! -x "$(command -v perf)" ]
+then
+    echo "Cannot find perf, please make sure it's installed"
+    exit 1
+fi
+
+# Run perf, this will block while alacritty runs.
+perf record -g -F 99 $DIR/../target/release/alacritty
+perf script \
+    | $DIR/create-flamegraph/FlameGraph/stackcollapse-perf.pl \
+    | $DIR/create-flamegraph/FlameGraph/flamegraph.pl --width 1920 \
+    > flame-$TIME.svg
 
-echo "Flame graph created at file://$(pwd)/alacritty.svg"
+# Tell users where the file is.
+echo "Flame graph created at: file://$(pwd)/flame-$TIME.svg"
diff --git a/scripts/ubuntu-install-perf.sh b/scripts/ubuntu-install-perf.sh
deleted file mode 100755
index 85670039..00000000
--- a/scripts/ubuntu-install-perf.sh
+++ /dev/null
@@ -1,11 +0,0 @@
-#!/usr/bin/env bash
-set -v
-
-# Get kernel info
-UNAME=$(uname -r)
-
-# Install linux tools for the perf binary
-sudo apt-get install -y \
-    linux-tools-common \
-    linux-tools-generic \
-    linux-tools-$UNAME