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#!/usr/bin/env bash
Color_Off='\e[0m'
Red='\e[0;31m'
Yellow='\e[0;33m'
Green='\e[0;32m'
#
# Print on stderr, in red
#
stderr() {
echo -e "${Red}[$(basename $0)]: ${*}${Color_Off}" >&2
}
#
# Print on stdout, if verbosity is enabled, prefix in green
#
stdout() {
[[ $VERBOSE -eq 1 ]] && echo -e "${Green}[$(basename $0)]:${Color_Off} $*"
}
#
# Get the command name from a script path
#
scriptname_to_command() {
echo "$1" | sed 's,^\.\/nix-script-,,' | sed 's,\.sh$,,' | \
sed -r "s,$(dirname ${BASH_SOURCE[0]})/nix-script-,,"
}
#
# Generate a help synopsis text
#
help_synopsis() {
SCRIPT=$(scriptname_to_command $1); shift
echo "usage: nix-script $SCRIPT $*"
}
#
# generate a help text footnote
#
help_end() {
echo -e "\tAdding '-v' before the '$1' command turns on verbosity"
echo -e ""
echo -e "\tReleased under terms of GPLv2"
echo -e "\t(c) 2015 Matthias Beyer"
echo ""
}
#
# Explain the next command
#
explain() {
stdout "$*"
$*
}
#
# Helper for greping the current generation
#
grep_generation() {
$* | grep current | sed -r 's,\s*([0-9]*)(.*),\1,'
}
#
# get the current system generation
#
current_system_generation() {
grep_generation "sudo nix-env -p /nix/var/nix/profiles/system --list-generations"
}
#
# get the current user generation
#
current_user_generation() {
grep_generation "nix-env --list-generations"
}
#
# Ask the user whether to continue or not
#
continue_question() {
local answer
echo -ne "${Yellow}$1 [yN]?:${Color_Off} " >&2
read answer
echo ""
[[ "${answer}" =~ ^[Yy]$ ]] || return 1
}
#
# Ask whether a command should be executed or not.
#
ask_execute() {
q="$1"; shift
local answer
echo -ne "${Yellow}$q${Color_Off} [Yn]? "
read answer; echo
[[ ! "${answer}" =~ ^[Nn]$ ]] && eval $*
}
#
# Helper for executing git commands in another git directory
#
__git() {
DIR=$1; shift
explain git --git-dir="$DIR/.git" --work-tree="$DIR" $*
}
# Gets the current branch name or the hash of the current rev if there is no
# branch
__git_current_branch() {
branch_name=$(git symbolic-ref -q HEAD)
branch_name=${branch_name##refs/heads/}
([[ -z "$branch_name" ]] && git rev-parse HEAD) || echo $branch_name
}
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