legit-show

#!/bin/dash

filename="`echo "$0" | rev | cut -d'/' -f1 | rev `"

if [ ! -d ".legit" ]; then
	echo "$filename: error: no .legit directory containing legit repository exists" >&2
	exit 1
fi
branch=`cat .legit/current_branch`
if [ -z "$(ls -A .legit/"$branch"/commit)" ]; then
	echo "$filename: error: your repository does not have any commits yet" >&2
	exit 1
elif [ $# -ne 1 ]; then
	echo "usage: $filename <commit>:<filename>" >&2
	exit 1
fi

check=$(echo "$1" | egrep ":")
if [ -z "$check" ]; then
	echo "$filename: error: invalid object "$1"" >&2	
	exit 1
fi
commit=$(echo "$1" | cut -d':' -f1)
file=$(echo "$1" | cut -d':' -f2)

files=$(echo "$file" | egrep "[^a-zA-Z0-9._-]")	
if [ ! -z $files ]; then	
	echo ""$filename": error: invalid filename '"$file"'" >&2
	exit 1
fi

if [ -z $commit ]; then

	if [ ! -f .legit/add/"$file" ]; then
		echo "$filename: error: '"$file"' not found in index" >&2
		exit 1
	else
		cat .legit/add/"$file"
		exit 1
	fi
fi

testing=$(echo "$commit" | egrep [0-9])			
if [ -z $testing ]; then
	echo "usage: $filename <commit>:<filename>" >&2
	exit 1
fi

check=$(cat .legit/"$branch"/commit/commit_history.txt | egrep "commit $commit")
if [ -z "$check" ]; then
	echo "$filename: error: unknown commit '$commit'" >&2
	exit 1
elif [ ! -f .legit/"$branch"/commit/commit_$commit/"$file" ]; then
	echo "$filename: error: '"$file"' not found in commit $commit" >&2
	exit 1
else
	cat .legit/"$branch"/commit/commit_$commit/"$file"
fi