# git-gui index (add/remove) support
# Copyright (C) 2006, 2007 Shawn Pearce

proc _delete_indexlock {} {
        if {[catch {file delete -- [gitdir index.lock]} err]} {
                error_popup [strcat [mc "Unable to unlock the index."] "\n\n$err"]
        }
}

proc _close_updateindex {fd after} {
        fconfigure $fd -blocking 1
        if {[catch {close $fd} err]} {
                set w .indexfried
                toplevel $w
                wm title $w [strcat "[appname] ([reponame]): " [mc "Index Error"]]
                wm geometry $w "+[winfo rootx .]+[winfo rooty .]"
                pack [label $w.msg \
                        -justify left \
                        -anchor w \
                        -text [strcat \
                                [mc "Updating the Git index failed.  A rescan will be automatically started to resynchronize git-gui."] \
                                "\n\n$err"] \
                        ] -anchor w

                frame $w.buttons
                button $w.buttons.continue \
                        -text [mc "Continue"] \
                        -command [list destroy $w]
                pack $w.buttons.continue -side right -padx 5
                button $w.buttons.unlock \
                        -text [mc "Unlock Index"] \
                        -command "destroy $w; _delete_indexlock"
                pack $w.buttons.unlock -side right
                pack $w.buttons -side bottom -fill x -pady 10 -padx 10

                wm protocol $w WM_DELETE_WINDOW update
                bind $w.buttons.continue <Visibility> "
                        grab $w
                        focus $w.buttons.continue
                "
                tkwait window $w

                $::main_status stop
                unlock_index
                rescan $after 0
                return
        }

        $::main_status stop
        unlock_index
        uplevel #0 $after
}

proc update_indexinfo {msg pathList after} {
        global update_index_cp

        if {![lock_index update]} return

        set update_index_cp 0
        set pathList [lsort $pathList]
        set totalCnt [llength $pathList]
        set batch [expr {int($totalCnt * .01) + 1}]
        if {$batch > 25} {set batch 25}

        $::main_status start $msg [mc "files"]
        set fd [git_write update-index -z --index-info]
        fconfigure $fd \
                -blocking 0 \
                -buffering full \
                -buffersize 512 \
                -encoding binary \
                -translation binary
        fileevent $fd writable [list \
                write_update_indexinfo \
                $fd \
                $pathList \
                $totalCnt \
                $batch \
                $after \
                ]
}

proc write_update_indexinfo {fd pathList totalCnt batch after} {
        global update_index_cp
        global file_states current_diff_path

        if {$update_index_cp >= $totalCnt} {
                _close_updateindex $fd $after
                return
        }

        for {set i $batch} \
                {$update_index_cp < $totalCnt && $i > 0} \
                {incr i -1} {
                set path [lindex $pathList $update_index_cp]
                incr update_index_cp

                set s $file_states($path)
                switch -glob -- [lindex $s 0] {
                A? {set new _O}
                M? {set new _M}
                D_ {set new _D}
                D? {set new _?}
                ?? {continue}
                }
                set info [lindex $s 2]
                if {$info eq {}} continue

                puts -nonewline $fd "$info\t[encoding convertto $path]\0"
                display_file $path $new
        }

        $::main_status update $update_index_cp $totalCnt
}

proc update_index {msg pathList after} {
        global update_index_cp

        if {![lock_index update]} return

        set update_index_cp 0
        set pathList [lsort $pathList]
        set totalCnt [llength $pathList]
        set batch [expr {int($totalCnt * .01) + 1}]
        if {$batch > 25} {set batch 25}

        $::main_status start $msg [mc "files"]
        set fd [git_write update-index --add --remove -z --stdin]
        fconfigure $fd \
                -blocking 0 \
                -buffering full \
                -buffersize 512 \
                -encoding binary \
                -translation binary
        fileevent $fd writable [list \
                write_update_index \
                $fd \
                $pathList \
                $totalCnt \
                $batch \
                $after \
                ]
}

proc write_update_index {fd pathList totalCnt batch after} {
        global update_index_cp
        global file_states current_diff_path

        if {$update_index_cp >= $totalCnt} {
                _close_updateindex $fd $after
                return
        }

        for {set i $batch} \
                {$update_index_cp < $totalCnt && $i > 0} \
                {incr i -1} {
                set path [lindex $pathList $update_index_cp]
                incr update_index_cp

                switch -glob -- [lindex $file_states($path) 0] {
                AD {set new __}
                ?D {set new D_}
                _O -
                AM {set new A_}
                U? {
                        if {[file exists $path]} {
                                set new M_
                        } else {
                                set new D_
                        }
                }
                ?M {set new M_}
                ?? {continue}
                }
                puts -nonewline $fd "[encoding convertto $path]\0"
                display_file $path $new
        }

        $::main_status update $update_index_cp $totalCnt
}

proc checkout_index {msg pathList after} {
        global update_index_cp

        if {![lock_index update]} return

        set update_index_cp 0
        set pathList [lsort $pathList]
        set totalCnt [llength $pathList]
        set batch [expr {int($totalCnt * .01) + 1}]
        if {$batch > 25} {set batch 25}

        $::main_status start $msg [mc "files"]
        set fd [git_write checkout-index \
                --index \
                --quiet \
                --force \
                -z \
                --stdin \
                ]
        fconfigure $fd \
                -blocking 0 \
                -buffering full \
                -buffersize 512 \
                -encoding binary \
                -translation binary
        fileevent $fd writable [list \
                write_checkout_index \
                $fd \
                $pathList \
                $totalCnt \
                $batch \
                $after \
                ]
}

proc write_checkout_index {fd pathList totalCnt batch after} {
        global update_index_cp
        global file_states current_diff_path

        if {$update_index_cp >= $totalCnt} {
                _close_updateindex $fd $after
                return
        }

        for {set i $batch} \
                {$update_index_cp < $totalCnt && $i > 0} \
                {incr i -1} {
                set path [lindex $pathList $update_index_cp]
                incr update_index_cp
                switch -glob -- [lindex $file_states($path) 0] {
                U? {continue}
                ?M -
                ?D {
                        puts -nonewline $fd "[encoding convertto $path]\0"
                        display_file $path ?_
                }
                }
        }

        $::main_status update $update_index_cp $totalCnt
}

proc unstage_helper {txt paths} {
        global file_states current_diff_path

        if {![lock_index begin-update]} return

        set pathList [list]
        set after {}
        foreach path $paths {
                switch -glob -- [lindex $file_states($path) 0] {
                A? -
                M? -
                D? {
                        lappend pathList $path
                        if {$path eq $current_diff_path} {
                                set after {reshow_diff;}
                        }
                }
                }
        }
        if {$pathList eq {}} {
                unlock_index
        } else {
                update_indexinfo \
                        $txt \
                        $pathList \
                        [concat $after [list ui_ready]]
        }
}

proc do_unstage_selection {} {
        global current_diff_path selected_paths

        if {[array size selected_paths] > 0} {
                unstage_helper \
                        {Unstaging selected files from commit} \
                        [array names selected_paths]
        } elseif {$current_diff_path ne {}} {
                unstage_helper \
                        [mc "Unstaging %s from commit" [short_path $current_diff_path]] \
                        [list $current_diff_path]
        }
}

proc add_helper {txt paths} {
        global file_states current_diff_path

        if {![lock_index begin-update]} return

        set pathList [list]
        set after {}
        foreach path $paths {
                switch -glob -- [lindex $file_states($path) 0] {
                _O -
                ?M -
                ?D -
                U? {
                        lappend pathList $path
                        if {$path eq $current_diff_path} {
                                set after {reshow_diff;}
                        }
                }
                }
        }
        if {$pathList eq {}} {
                unlock_index
        } else {
                update_index \
                        $txt \
                        $pathList \
                        [concat $after {ui_status {Ready to commit.}}]
        }
}

proc do_add_selection {} {
        global current_diff_path selected_paths

        if {[array size selected_paths] > 0} {
                add_helper \
                        {Adding selected files} \
                        [array names selected_paths]
        } elseif {$current_diff_path ne {}} {
                add_helper \
                        [mc "Adding %s" [short_path $current_diff_path]] \
                        [list $current_diff_path]
        }
}

proc do_add_all {} {
        global file_states

        set paths [list]
        foreach path [array names file_states] {
                switch -glob -- [lindex $file_states($path) 0] {
                U? {continue}
                ?M -
                ?D {lappend paths $path}
                }
        }
        add_helper {Adding all changed files} $paths
}

proc revert_helper {txt paths} {
        global file_states current_diff_path

        if {![lock_index begin-update]} return

        set pathList [list]
        set after {}
        foreach path $paths {
                switch -glob -- [lindex $file_states($path) 0] {
                U? {continue}
                ?M -
                ?D {
                        lappend pathList $path
                        if {$path eq $current_diff_path} {
                                set after {reshow_diff;}
                        }
                }
                }
        }


        # Split question between singular and plural cases, because
        # such distinction is needed in some languages. Previously, the
        # code used "Revert changes in" for both, but that can't work
        # in languages where 'in' must be combined with word from
        # rest of string (in diffrent way for both cases of course).
        #
        # FIXME: Unfortunately, even that isn't enough in some languages
        # as they have quite complex plural-form rules. Unfortunately,
        # msgcat doesn't seem to support that kind of string translation.
        #
        set n [llength $pathList]
        if {$n == 0} {
                unlock_index
                return
        } elseif {$n == 1} {
                set query [mc "Revert changes in file %s?" [short_path [lindex $pathList]]]
        } else {
                set query [mc "Revert changes in these %i files?" $n]
        }

        set reply [tk_dialog \
                .confirm_revert \
                "[appname] ([reponame])" \
                [mc "Any unstaged changes will be permanently lost by the revert."] \
                question \
                1 \
                [mc "Do Nothing"] \
                [mc "Revert Changes"] \
                ]
        if {$reply == 1} {
                checkout_index \
                        $txt \
                        $pathList \
                        [concat $after [list ui_ready]]
        } else {
                unlock_index
        }
}

proc do_revert_selection {} {
        global current_diff_path selected_paths

        if {[array size selected_paths] > 0} {
                revert_helper \
                        {Reverting selected files} \
                        [array names selected_paths]
        } elseif {$current_diff_path ne {}} {
                revert_helper \
                        "Reverting [short_path $current_diff_path]" \
                        [list $current_diff_path]
        }
}

proc do_select_commit_type {} {
        global commit_type selected_commit_type

        if {$selected_commit_type eq {new}
                && [string match amend* $commit_type]} {
                create_new_commit
        } elseif {$selected_commit_type eq {amend}
                && ![string match amend* $commit_type]} {
                load_last_commit

                # The amend request was rejected...
                #
                if {![string match amend* $commit_type]} {
                        set selected_commit_type new
                }
        }
}