rtraschke/gitcolorage.lua

## gitcolorage.lua
--[[
Little script that expects to be fed the output of "git blame -t -p"
and will generate SVG image 50 px high with horizontal lines coloured
by the age of a line of code. See the accompanying shells script for
an example invocation.

The SVG will be the number of code lines wide (plus a border).

The brightness of a vertical line shows the age, white being just now,
black, the time the file was first created.

A Gamma exponent is used to make aging non-linear.

]]

local gamma = 1.8

local now = os.time()
local oldest = now
local line_time
local lines = {}

local line = io.read("*l")
while line do
	if line:match("^committer%-time") then
		_, _, line_time = line:find("^committer%-time (%d+)")
		line_time = tonumber(line_time)
		if line_time < oldest then
			oldest = line_time
		end
	elseif line:match("^"..("%x"):rep(40)) then
		lines[#lines+1] = line_time
	end
	line = io.read("*l")
end

print(string.format("<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='50' width='%d'>", #lines+2))
print("<line x1='0' y1='0' x2='0' y2='50' stroke='black' />")
print(string.format("<line x1='0' y1='0' x2='%d' y2='0' stroke='black' />", #lines+1))
local percent, adjusted
for i, n in ipairs(lines) do
	percent = (n - oldest) / (now - oldest)
        adjusted = math.pow(percent, gamma)
	print(string.format("<line x1='%d' y1='1' x2='%d' y2='49' stroke='hsl(25, 75%%, %d%%)' />", i, i, adjusted*100))
end
print(string.format("<line x1='0' y1='50' x2='%d' y2='50' stroke='black' />", #lines+1))
print(string.format("<line x1='%d' y1='0' x2='%d' y2='50' stroke='black' />", #lines+1, #lines+1))
print("</svg>")

## gitcolorage.sh
RUNNER_SCRIPT_DIR=$(cd ${0%/*} && pwd)

echo "<html>"
echo "<style>"
echo "table { border-collapse:collapse; }"
echo "table, th { border: 1px solid black; }"
echo "td { border: 0px; }"
echo "<style>"
echo "</style>"
echo "<body>"

echo "<table>"
for i in `git ls-files`
do
	echo "<tr>"
	echo "<th>" $i "</th>"
	echo "<td>"
	git blame -t -p $i | lua $RUNNER_SCRIPT_DIR/gitcolorage.lua
	echo "</td>"
	echo "</tr>"
done
echo "</table>"

echo "</body>"
echo "</html>"
	--[[
	Little script that expects to be fed the output of "git blame -t -p"
	and will generate SVG image 50 px high with horizontal lines coloured
	by the age of a line of code. See the accompanying shells script for
	an example invocation.

	The SVG will be the number of code lines wide (plus a border).

	The brightness of a vertical line shows the age, white being just now,
	black, the time the file was first created.

	A Gamma exponent is used to make aging non-linear.

	]]

	local gamma = 1.8

	local now = os.time()
	local oldest = now
	local line_time
	local lines = {}

	local line = io.read("*l")
	while line do
	if line:match("^committer%-time") then
	_, _, line_time = line:find("^committer%-time (%d+)")
	line_time = tonumber(line_time)
	if line_time < oldest then
	oldest = line_time
	end
	elseif line:match("^"..("%x"):rep(40)) then
	lines[#lines+1] = line_time
	end
	line = io.read("*l")
	end

	print(string.format("<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='50' width='%d'>", #lines+2))
	print("<line x1='0' y1='0' x2='0' y2='50' stroke='black' />")
	print(string.format("<line x1='0' y1='0' x2='%d' y2='0' stroke='black' />", #lines+1))
	local percent, adjusted
	for i, n in ipairs(lines) do
	percent = (n - oldest) / (now - oldest)
	adjusted = math.pow(percent, gamma)
	print(string.format("<line x1='%d' y1='1' x2='%d' y2='49' stroke='hsl(25, 75%%, %d%%)' />", i, i, adjusted*100))
	end
	print(string.format("<line x1='0' y1='50' x2='%d' y2='50' stroke='black' />", #lines+1))
	print(string.format("<line x1='%d' y1='0' x2='%d' y2='50' stroke='black' />", #lines+1, #lines+1))
	print("</svg>")
	RUNNER_SCRIPT_DIR=$(cd ${0%/*} && pwd)

	echo "<html>"
	echo "<style>"
	echo "table { border-collapse:collapse; }"
	echo "table, th { border: 1px solid black; }"
	echo "td { border: 0px; }"
	echo "<style>"
	echo "</style>"
	echo "<body>"

	echo "<table>"
	for i in `git ls-files`
	do
	echo "<tr>"
	echo "<th>" $i "</th>"
	echo "<td>"
	git blame -t -p $i \| lua $RUNNER_SCRIPT_DIR/gitcolorage.lua
	echo "</td>"
	echo "</tr>"
	done
	echo "</table>"

	echo "</body>"
	echo "</html>"