# git-gui branch create support
# Copyright (C) 2006, 2007 Shawn Pearce

class branch_create {

field w              ; # widget path
field w_rev          ; # mega-widget to pick the initial revision
field w_name         ; # new branch name widget

field name         {}; # name of the branch the user has chosen
field name_type  user; # type of branch name to use

field opt_checkout  1; # automatically checkout the new branch?

constructor dialog {} {
        global repo_config

        make_toplevel top w
        wm title $top "[appname] ([reponame]): Create Branch"
        if {$top ne {.}} {
                wm geometry $top "+[winfo rootx .]+[winfo rooty .]"
        }

        label $w.header -text {Create New Branch} -font font_uibold
        pack $w.header -side top -fill x

        frame $w.buttons
        button $w.buttons.create -text Create \
                -default active \
                -command [cb _create]
        pack $w.buttons.create -side right
        button $w.buttons.cancel -text {Cancel} \
                -command [list destroy $w]
        pack $w.buttons.cancel -side right -padx 5
        pack $w.buttons -side bottom -fill x -pady 10 -padx 10

        labelframe $w.desc -text {Branch Name}
        radiobutton $w.desc.name_r \
                -anchor w \
                -text {Name:} \
                -value user \
                -variable @name_type
        set w_name $w.desc.name_t
        entry $w_name \
                -borderwidth 1 \
                -relief sunken \
                -width 40 \
                -textvariable @name \
                -validate key \
                -validatecommand [cb _validate %d %S]
        grid $w.desc.name_r $w_name -sticky we -padx {0 5}

        radiobutton $w.desc.match_r \
                -anchor w \
                -text {Match Tracking Branch Name} \
                -value match \
                -variable @name_type
        grid $w.desc.match_r -sticky we -padx {0 5} -columnspan 2

        grid columnconfigure $w.desc 1 -weight 1
        pack $w.desc -anchor nw -fill x -pady 5 -padx 5

        set w_rev [::choose_rev::new $w.rev {Starting Revision}]
        pack $w.rev -anchor nw -fill x -pady 5 -padx 5

        labelframe $w.postActions -text {Post Creation Actions}
        checkbutton $w.postActions.checkout \
                -text {Checkout after creation} \
                -variable @opt_checkout
        pack $w.postActions.checkout -anchor nw
        pack $w.postActions -anchor nw -fill x -pady 5 -padx 5

        set name $repo_config(gui.newbranchtemplate)

        bind $w <Visibility> "
                grab $w
                $w_name icursor end
                focus $w_name
        "
        bind $w <Key-Escape> [list destroy $w]
        bind $w <Key-Return> [cb _create]\;break
        tkwait window $w
}

method _create {} {
        global null_sha1 repo_config
        global all_heads

        switch -- $name_type {
        user {
                set newbranch $name
        }
        match {
                set spec [$w_rev get_tracking_branch]
                if {$spec eq {}} {
                        tk_messageBox \
                                -icon error \
                                -type ok \
                                -title [wm title $w] \
                                -parent $w \
                                -message "Please select a tracking branch."
                        return
                }
                if {![regsub ^refs/heads/ [lindex $spec 2] {} newbranch]} {
                        tk_messageBox \
                                -icon error \
                                -type ok \
                                -title [wm title $w] \
                                -parent $w \
                                -message "Tracking branch [$w get] is not a branch in the remote repository."
                        return
                }
        }
        }

        if {$newbranch eq {}
                || $newbranch eq $repo_config(gui.newbranchtemplate)} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Please supply a branch name."
                focus $w_name
                return
        }
        if {![catch {git show-ref --verify -- "refs/heads/$newbranch"}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Branch '$newbranch' already exists."
                focus $w_name
                return
        }
        if {[catch {git check-ref-format "heads/$newbranch"}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "We do not like '$newbranch' as a branch name."
                focus $w_name
                return
        }

        if {[catch {set cmt [$w_rev get_commit]}]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Invalid starting revision: [$w_rev get]"
                return
        }
        if {[catch {
                        git update-ref \
                                -m "branch: Created from [$w_rev get]" \
                                "refs/heads/$newbranch" \
                                $cmt \
                                $null_sha1
                } err]} {
                tk_messageBox \
                        -icon error \
                        -type ok \
                        -title [wm title $w] \
                        -parent $w \
                        -message "Failed to create '$newbranch'.\n\n$err"
                return
        }

        lappend all_heads $newbranch
        set all_heads [lsort $all_heads]
        populate_branch_menu
        destroy $w
        if {$opt_checkout} {
                switch_branch $newbranch
        }
}

method _validate {d S} {
        if {$d == 1} {
                if {[regexp {[~^:?*\[\0- ]} $S]} {
                        return 0
                }
                if {[string length $S] > 0} {
                        set name_type user
                }
        }
        return 1
}

}