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# Frontend to controlling prompt
prompt() {
# If no arguments, print the prompt strings as they are
if ! (($#)) ; then
declare -p PS1 PS2 PS3 PS4
return
fi
# What's done next depends on the first argument to the function
case $1 in
# Turn complex, colored PS1 and debugging PS4 prompts on
on)
# Declare the PROMPT_RETURN variable as an integer
declare -i PROMPT_RETURN
# Set up pre-prompt command
PROMPT_COMMAND='PROMPT_RETURN=$? ; history -a'
# If Bash 4.0 is available, trim very long paths in prompt
if ((BASH_VERSINFO[0] >= 4)) ; then
PROMPT_DIRTRIM=4
fi
# Basic prompt shape
PS1='\u@\h:\w'
# Add sub-commands; VCS, job, and return status checks
PS1=$PS1'$(prompt vcs)$(prompt job)$(prompt ret)'
# Add prefix and suffix
PS1='${PROMPT_PREFIX}'$PS1'${PROMPT_SUFFIX}'
# Add terminating "$" or "#" sign
PS1=$PS1'\$'
# Count available colors
local -i colors
colors=$( {
tput Co || tput colors
} 2>/dev/null )
# Prepare reset code
local reset
reset=$( {
tput me || tput sgr0
} 2>/dev/null )
# Decide prompt color formatting based on color availability
local format
case $colors in
# Check if we have non-bold bright green available
256)
format=$( {
: "${PROMPT_COLOR:=10}"
tput AF "$PROMPT_COLOR" ||
tput setaf "$PROMPT_COLOR" ||
tput AF "$PROMPT_COLOR" 0 0 ||
tput setaf "$PROMPT_COLOR" 0 0
} 2>/dev/null )
;;
# If we have only eight colors, use bold green
8)
format=$( {
: "${PROMPT_COLOR:=2}"
tput AF "$PROMPT_COLOR" ||
tput setaf "$PROMPT_COLOR"
tput md || tput bold
} 2>/dev/null )
;;
# For all other terminals, we assume non-color (!), and we just
# use bold
*)
format=$( {
tput md || tput bold
} 2>/dev/null )
;;
esac
# String it all together
PS1='\['"$format"'\]'"$PS1"'\['"$reset"'\] '
PS2='> '
PS3='? '
PS4='+<$?> ${BASH_SOURCE:-$BASH}:$FUNCNAME:$LINENO:'
;;
# Revert to simple inexpensive prompts
off)
unset -v PROMPT_COMMAND PROMPT_DIRTRIM PROMPT_RETURN
PS1='\$ '
PS2='> '
PS3='? '
PS4='+ '
;;
# Git prompt function
git)
# Bail if we have no git(1)
if ! hash git 2>/dev/null ; then
return 1
fi
# Attempt to determine git branch, bail if we can't
local branch
branch=$( {
git symbolic-ref --quiet HEAD ||
git rev-parse --short HEAD
} 2>/dev/null )
if [[ ! -n $branch ]] ; then
return 1
fi
branch=${branch##*/}
# Collect symbols representing repository state
local state
if ! git diff-files --quiet ; then
state=${state}!
fi
if ! git diff-index --cached --quiet HEAD ; then
state=${state}+
fi
if [[ -n $(git ls-files --others --exclude-standard) ]] ; then
state=${state}\?
fi
if git rev-parse --quiet --verify refs/stash >/dev/null ; then
state=${state}^
fi
# Print the status in brackets; add a git: prefix only if there
# might be another VCS prompt (because PROMPT_VCS is set)
printf '(%s%s%s)' "${PROMPT_VCS:+git:}" "${branch:-unknown}" "$state"
;;
# Subversion prompt function
svn)
# Bail if we have no svn(1)
if ! hash svn 2>/dev/null ; then
return 1
fi
# Determine the repository URL and root directory
local key value url root
while IFS=: read -r key value ; do
case $key in
'URL')
url=${value## }
;;
'Repository Root')
root=${value## }
;;
esac
done < <(svn info 2>/dev/null)
# Exit if we couldn't get either
if [[ ! -n $url || ! -n $root ]] ; then
return 1
fi
# Remove the root from the URL to get what's hopefully the branch
# name, removing leading slashes and the 'branches' prefix, and any
# trailing content after a slash
local branch
branch=${url/"$root"}
branch=${branch#/}
branch=${branch#branches/}
branch=${branch%%/*}
# Parse the output of svn status to determine working copy state
local symbol
local -i modified untracked
while read -r symbol _ ; do
if [[ $symbol == *'?'* ]] ; then
untracked=1
else
modified=1
fi
done < <(svn status 2>/dev/null)
# Add appropriate state flags
local -a state
if ((modified)) ; then
state[${#state[@]}]='!'
fi
if ((untracked)) ; then
state[${#state[@]}]='?'
fi
# Print the state in brackets with an svn: prefix
(IFS= ; printf '(svn:%s%s)' "${branch:-unknown}" "${state[*]}")
;;
# VCS wrapper prompt function; print the first relevant prompt, if any
vcs)
local vcs
for vcs in "${PROMPT_VCS[@]:-git}" ; do
if prompt "$vcs" ; then
return
fi
done
;;
# Show return status of previous command in angle brackets, if not zero
ret)
if ((PROMPT_RETURN > 0)) ; then
printf '<%u>' "$PROMPT_RETURN"
fi
;;
# Show the count of background jobs in curly brackets, if not zero
job)
local -i jobc
while read ; do
((jobc++))
done < <(jobs -p)
if ((jobc > 0)) ; then
printf '{%u}' "$jobc"
fi
;;
# Print error
*)
printf '%s: Unknown command %s\n' "$FUNCNAME" "$1" >&2
return 2
;;
esac
}
# Start with full-fledged prompt
prompt on
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