Open a commit for a line of a file on github

git-hub-blame

#!/bin/sh
#
# Usage: git hub-blame file line
#
# Opens the commit where the given line originates in the commit view. Useful for
# code review on github.

FILENAME=$1
LINE=$2

# lookup original commit, file and line
set -- $(git blame -p -L$LINE,$LINE "$FILENAME" |
    awk '/filename/ {match($0, /^filename /); origfile = substr($0, RLENGTH+1)};
        NR == 1 { commit = $1; origline = $2 };
        END { print commit " " origfile " " origline }')

COMMIT=$1
ORIGFILE=$2
ORIGLINE=$3

# get the line number of the original file in the original commit diff (so that we can generate the anchor tag for github)
set -- $(git diff-tree -r --name-only $COMMIT ${COMMIT}~1 |
    awk -v origfile="$ORIGFILE" '$0 ~ origfile { print NR-1; exit } ')

ORIGNUM=$1

hub browse -- commit/${COMMIT}#L${ORIGNUM}R${ORIGLINE}