A bash_completion file for Fossil SCM, as /etc/bash_completion.d/git works for Git, providing a __fossil_ps1 bash function, and other tools.

fossil.bash_completion

# Bash completion support for Fossil.
# It is based on the Git Bash completion file.
# It best fits in /etc/bash_completion.d/fossil
#
# Copyright (C) 2011 Vivien Didelot <vivien@didelot.org>
# This file is distributed under the same terms as the license of the Fossil project.
#
# This file contains routine to change your PS1, and helper functions.
#
# For instance, add those options to your bashrc to customize PS1:
#
#     # Customize PS1 with Fossil routines
#     FOSSIL_PS1_SHOWDIRTYSTATE=1 # Add Fossil dirty state mark to PS1
#     FOSSIL_PS1_SHOWSTASHSTATE=1 # Show if something is stashed
#     FOSSIL_PS1_SHOWUNTRACKEDFILES=1 # Show if there're untracked files
#
#     # Customize the prompt
#     PS1='$(date +%R) \W$(__fossil_ps1 " $(__fossil_proj) (%s)") > '

# Tests if it is an opened Fossil repository.
__fossil_is_opened ()
{
    test -e ./_FOSSIL_
}

# Returns specific info from the Fossil info command according to the first argument.
__fossil_info ()
{
    (($#)) || return
    if __fossil_is_opened ; then
        while read key value ; do
            if [[ "$key" == "$1:" ]] ; then
                echo "$value"
                return
            fi
        done < <(fossil info)
    fi
}

# Returns the Fossil project name.
__fossil_proj ()
{
    __fossil_info "project-name"
}

# Returns the Fossil repository file.
__fossil_repo ()
{
    __fossil_info "repository"
}

# Checks if the source tree contains changes.
__fossil_is_dirty ()
{
    if __fossil_is_opened ; then
        [[ -n `fossil changes` ]]
    fi
}

# Returns the list of untracked files.
__fossil_untracked_files ()
{
    if __fossil_is_opened ; then
        local r e
        r="`__fossil_repo`"
        e="_FOSSIL_"
        if [[ "`pwd`" == "`dirname "$r"`" ]] ; then
            e="$e|`basename "$r"`"
        fi
        comm -13 <(fossil ls | sort) <(find -type f | sed 's!^\./!!' | sort) | grep -vE "$e"
    fi
}

# Checks if the source tree have untracked files.
__fossil_has_untracked_files ()
{
    [[ -n `__fossil_untracked_files` ]]
}

# Checks if the source tree has stashes.
__fossil_has_stashes ()
{
    [[ "`fossil stash list`" != "empty stash" ]]
}

# Returns the current branch name.
__fossil_current_branch ()
{
    #fossil branch | grep '*' | sed 's/^\* //' # only the branch name
    __fossil_info "tags" # branch name and tags
}

# Returns a formatted string for the prompt.
#
# If $FOSSIL_PS1_SHOWDIRTYSTATE is set to a non-empty value
# and if the source tree has changes, it will display a *.
# If $FOSSIL_PS1_SHOWDIRTYSTATE is set to a non-empty value
# and if the source tree has untracked files, it will display a %.
# If $FOSSIL_PS1_SHOWDIRTYSTATE is set to a non-empty value
# and if the source tree has stashes, it will display a $.
#
# The string format can be changed with the first argument.
__fossil_ps1 ()
{
    if __fossil_is_opened ; then
        local b d u s
        b="`__fossil_current_branch`"
        d=""
        u=""
        s=""
        if [[ -n "${FOSSIL_PS1_SHOWDIRTYSTATE-}" ]] ; then
            if __fossil_is_dirty ; then
                d="*"
            fi
        fi
        if [[ -n "${FOSSIL_PS1_SHOWUNTRACKEDFILES-}" ]] ; then
            if __fossil_has_untracked_files ; then
                u="%"
            fi
        fi
        if [[ -n "${FOSSIL_PS1_SHOWSTASHSTATE-}" ]] ; then
            if __fossil_has_stashes ; then
                s='$'
            fi
        fi
        local f="$d$u$s"
        printf "${1:- (%s)}" "$b${f:+ $f}"
    fi
}