git-rfetch

#!/bin/bash -e
## Check for updates, is an alias for
## git fetch --recurse-submodule=yes
## with some modifications of the output.

## read input, display help if necessary
if [[ "$@" == *--help* ]]; then
    cat<<EOF
 Recursive fetch

 This command recursively fetches changes from origin.
 (Up to output it is equal to running 
    git fetch --recurse-submodules=yes.)

 Usage:
    git rfetch ...

    ...: same arguments as git fetch
EOF
    exit 0;
fi

## from the git mailinglist:
function git
{
    LC_MESSAGES=C command git "$@"
} 
export git

## run fetch
tmp=`git fetch --recurse-submodules=yes "$@" 2>&1`
## and process output
last="_start_"
output=""
while read line; do
    if [[ "${line:0:5}" == "Fetch" ]]; then
	last="$line"
    elif [[ "${line:0:4}" == "From" ]]; then
	if [[ "$last" == "_start_" ]]; then
	    output="${output}There are updates available for the current repository.
"
	elif [[ "$last" != "" ]]; then
	    output="${output}There are updates available for ${last:19}.
"
	fi
	last=""
    fi
done <<< "$tmp"

if [[ "$output" ]]; then
    if [[ "$@" == "--dry-run" ]]; then
	cat<<EOF 
${output}Use "git rfetch" to fetch updates.
Then go to the innermost submodules and use "git rpull" to merge the updates.
EOF
    else
	cat<<EOF 
${output}Fetched updates. Now use "git rdiff" to show the differing files. 
Then "git rpull" in the correct folder to merge updates.
EOF
    fi
fi