Pre commit hook for checking go source conventions usage

pre-commit

#!/bin/bash

# This pre hook runs all go checking tools on every relevant go file.
# Returns status 1 if checks fail, preventing commit to be done

function fmtdiff {
    gofmt -d $@ > /tmp/gofmtdiff
    if [ `wc -l < /tmp/gofmtdiff` != 0 ]; then
        cat /tmp/gofmtdiff
        echo "Run gofmt to apply those changes"
        echo ""
        return 1
    fi
}

function gocheck {
    go vet $@ && golint $@ && fmtdiff $@
}

filter=''
filter=$filter'/^[AM]/!d;'    # Take only changed and added files
filter=$filter's/^.{3}//;'    # Strip off git status meta-info characters
filter=$filter'/^vendor\//d;' # Discard files in vendor directory
filter=$filter'/\.go/!d;'     # Only take go files

files=$(git status --porcelain | sed -nE '{'$filter';p;}')

# Run all checks for relevant files
status=0
for file_name in $files; do
  gocheck $file_name || status=1
done

exit $status