# colour of the revision number to display in the prompt
set -g __fish_svn_prompt_color_revision yellow

# setting the prompt status separator character
set -g __fish_svn_prompt_char_separator "|"

# ==============================

# SVN status display variables
# these are paired in groups of two:
# 1. the character to display in the prompt
# 2. the colour that should be used to display the character
#
# these variables are user-configurable and can be set to customize the display output

set -g __fish_svn_prompt_char_added_display A
set -g __fish_svn_prompt_char_added_color green

set -g __fish_svn_prompt_char_conflicted_display C
set -g __fish_svn_prompt_char_conflicted_color --underline magenta

set -g __fish_svn_prompt_char_deleted_display D
set -g __fish_svn_prompt_char_deleted_color red

set -g __fish_svn_prompt_char_ignored_display I
set -g __fish_svn_prompt_char_ignored_color --bold yellow

set -g __fish_svn_prompt_char_modified_display M
set -g __fish_svn_prompt_char_modified_color blue

set -g __fish_svn_prompt_char_replaced_display R
set -g __fish_svn_prompt_char_replaced_color cyan

set -g __fish_svn_prompt_char_unversioned_external_display X
set -g __fish_svn_prompt_char_unversioned_external_color --underline cyan

set -g __fish_svn_prompt_char_unversioned_display '?'
set -g __fish_svn_prompt_char_unversioned_color purple

set -g __fish_svn_prompt_char_missing_display !
set -g __fish_svn_prompt_char_missing_color yellow

set -g __fish_svn_prompt_char_versioned_obstructed_display '~'
set -g __fish_svn_prompt_char_versioned_obstructed_color magenta

set -g __fish_svn_prompt_char_locked_display L
set -g __fish_svn_prompt_char_locked_color --bold red

set -g __fish_svn_prompt_char_scheduled_display '+'
set -g __fish_svn_prompt_char_scheduled_color --bold green

set -g __fish_svn_prompt_char_switched_display S
set -g __fish_svn_prompt_char_switched_color --bold blue

set -g __fish_svn_prompt_char_token_present_display K
set -g __fish_svn_prompt_char_token_present_color --bold cyan

set -g __fish_svn_prompt_char_token_other_display O
set -g __fish_svn_prompt_char_token_other_color --underline purple

set -g __fish_svn_prompt_char_token_stolen_display T
set -g __fish_svn_prompt_char_token_stolen_color --bold purple

set -g __fish_svn_prompt_char_token_broken_display B
set -g __fish_svn_prompt_char_token_broken_color --bold magenta


# ==============================

function __fish_svn_prompt_parse_status --description "helper function that does pretty formatting on svn status"
    # SVN status symbols
    # Do not change these! These are the expected characters that are output from `svn status`, they are taken from `svn help status`
    set -l __fish_svn_prompt_chars A C D I M R X '?' ! '~' L + S K O T B
    # this sets up an array of all the types of status codes that could be returned.
    set -l __fish_svn_prompt_flag_names added conflicted deleted ignored modified replaced unversioned_external unversioned missing versioned_obstructed locked scheduled switched token_present token_other token_stolen token_broken
    # iterate over the different status types
    for flag_type in $__fish_svn_prompt_flag_names
        # resolve the name of the variable for the character representing the current status type
        set -l flag_index (contains -i $flag_type $__fish_svn_prompt_flag_names)
        # check to see if the status list for this column contains the character representing the current status type
        if contains -- $__fish_svn_prompt_chars[$flag_index] $argv
            # if it does, then get the names of the variables for the display character and colour to format it with
            set -l flag_var_display __fish_svn_prompt_char_{$flag_type}_display
            set -l flag_var_color __fish_svn_prompt_char_{$flag_type}_color
            # set the colour and print display character, then restore to default display colour
            printf '%s%s%s' (set_color $$flag_var_color) $$flag_var_display (set_color normal)
        end
    end
end


function fish_svn_prompt --description "Prompt function for svn"
    # if svn isn't installed or doesn't offer svnversion then don't do anything
    if not command -sq svn svnversion
        return 1
    end

    # make sure that this is a svn repo
    set -l checkout_info (command svn info 2>/dev/null)
    or return

    # get the current revision number
    printf '(%s%s%s' (set_color $__fish_svn_prompt_color_revision) (__fish_print_svn_rev) (set_color normal)

    # resolve the status of the checkout
    # 1. perform `svn status`
    # 2. remove extra lines that aren't necessary
    # 3. cut the output down to the first 7 columns, as these contain the information needed
    set -l svn_status_lines (command svn status | sed -e 's=^Summary of conflicts.*==' -e 's=^  Text conflicts.*==' -e 's=^  Property conflicts.*==' -e 's=^  Tree conflicts.*==' -e 's=.*incoming .* upon update.*==' | cut -c 1-7)

    # track the last column to contain a status flag
    set -l last_column 0

    # iterate over the 7 columns of output (the 7 columns are defined on `svn help status`)
    for col in (seq 7)
        # get the output for a particular column
        # 1. echo the whole status flag text
        # 2. cut out the current column of characters
        # 3. remove duplicates
        # 4. remove spaces
        set -l column_status (printf '%s\n' $svn_status_lines | cut -c $col | sort -u | tr -d ' ')

        # check that the column status list does not only contain an empty element (if it does, this column is empty)
        if [ (count $column_status) -gt 1 -o -n "$column_status[1]" ]

            # parse the status flags for this column and create the formatting by calling out to the helper function
            set -l svn_status_flags (__fish_svn_prompt_parse_status $column_status)

            # the default separator is empty
            set -l prompt_separator ""
            for index in (seq (math "$col - $last_column"))
                # the prompt separator variable has to be updated with the number of separators needed to represent empty status columns (eg: if a file has the status "A  +" then it should display as "A|||+" in the prompt)
                set prompt_separator $prompt_separator$__fish_svn_prompt_char_separator
            end

            # record that the current column was the last one printed to the prompt
            set last_column $col
            # print the separator string then the current column's status flags
            printf '%s%s' $prompt_separator $svn_status_flags
        end
    end

    # print the close of the svn status prompt
    printf ')'
end