# git-gui remote management
# Copyright (C) 2006, 2007 Shawn Pearce

set some_heads_tracking 0;  # assume not

proc is_tracking_branch {name} {
        global tracking_branches
        foreach spec $tracking_branches {
                set t [lindex $spec 0]
                if {$t eq $name || [string match $t $name]} {
                        return 1
                }
        }
        return 0
}

proc all_tracking_branches {} {
        global tracking_branches

        set all [list]
        set pat [list]
        set cmd [list]

        foreach spec $tracking_branches {
                set dst [lindex $spec 0]
                if {[string range $dst end-1 end] eq {/*}} {
                        lappend pat $spec
                        lappend cmd [string range $dst 0 end-2]
                } else {
                        lappend all $spec
                }
        }

        if {$pat ne {}} {
                set fd [eval git_read for-each-ref --format=%(refname) $cmd]
                while {[gets $fd n] > 0} {
                        foreach spec $pat {
                                set dst [string range [lindex $spec 0] 0 end-2]
                                set len [string length $dst]
                                if {[string equal -length $len $dst $n]} {
                                        set src [string range [lindex $spec 2] 0 end-2]
                                        set spec [list \
                                                $n \
                                                [lindex $spec 1] \
                                                $src[string range $n $len end] \
                                                ]
                                        lappend all $spec
                                }
                        }
                }
                close $fd
        }

        return [lsort -index 0 -unique $all]
}

proc load_all_remotes {} {
        global repo_config
        global all_remotes tracking_branches some_heads_tracking
        global remote_url

        set some_heads_tracking 0
        set all_remotes [list]
        set trck [list]

        set rh_str refs/heads/
        set rh_len [string length $rh_str]
        set rm_dir [gitdir remotes]
        if {[file isdirectory $rm_dir]} {
                set all_remotes [glob \
                        -types f \
                        -tails \
                        -nocomplain \
                        -directory $rm_dir *]

                foreach name $all_remotes {
                        catch {
                                set fd [open [file join $rm_dir $name] r]
                                while {[gets $fd line] >= 0} {
                                        if {[regexp {^URL:[     ]*(.+)$} $line line url]} {
                                                set remote_url($name) $url
                                                continue
                                        }
                                        if {![regexp {^Pull:[   ]*([^:]+):(.+)$} \
                                                $line line src dst]} continue
                                        if {[string index $src 0] eq {+}} {
                                                set src [string range $src 1 end]
                                        }
                                        if {![string equal -length 5 refs/ $src]} {
                                                set src $rh_str$src
                                        }
                                        if {![string equal -length 5 refs/ $dst]} {
                                                set dst $rh_str$dst
                                        }
                                        if {[string equal -length $rh_len $rh_str $dst]} {
                                                set some_heads_tracking 1
                                        }
                                        lappend trck [list $dst $name $src]
                                }
                                close $fd
                        }
                }
        }

        foreach line [array names repo_config remote.*.url] {
                if {![regexp ^remote\.(.*)\.url\$ $line line name]} continue
                lappend all_remotes $name
                set remote_url($name) $repo_config(remote.$name.url)

                if {[catch {set fl $repo_config(remote.$name.fetch)}]} {
                        set fl {}
                }
                foreach line $fl {
                        if {![regexp {^([^:]+):(.+)$} $line line src dst]} continue
                        if {[string index $src 0] eq {+}} {
                                set src [string range $src 1 end]
                        }
                        if {![string equal -length 5 refs/ $src]} {
                                set src $rh_str$src
                        }
                        if {![string equal -length 5 refs/ $dst]} {
                                set dst $rh_str$dst
                        }
                        if {[string equal -length $rh_len $rh_str $dst]} {
                                set some_heads_tracking 1
                        }
                        lappend trck [list $dst $name $src]
                }
        }

        set tracking_branches [lsort -index 0 -unique $trck]
        set all_remotes [lsort -unique $all_remotes]
}

proc add_fetch_entry {r} {
        global repo_config
        set remote_m .mbar.remote
        set fetch_m $remote_m.fetch
        set prune_m $remote_m.prune
        set enable 0
        if {![catch {set a $repo_config(remote.$r.url)}]} {
                if {![catch {set a $repo_config(remote.$r.fetch)}]} {
                        set enable 1
                }
        } else {
                catch {
                        set fd [open [gitdir remotes $r] r]
                        while {[gets $fd n] >= 0} {
                                if {[regexp {^Pull:[ \t]*([^:]+):} $n]} {
                                        set enable 1
                                        break
                                }
                        }
                        close $fd
                }
        }

        if {$enable} {
                if {![winfo exists $fetch_m]} {
                        menu $prune_m
                        $remote_m insert 0 cascade \
                                -label [mc "Prune from"] \
                                -menu $prune_m

                        menu $fetch_m
                        $remote_m insert 0 cascade \
                                -label [mc "Fetch from"] \
                                -menu $fetch_m
                }

                $fetch_m add command \
                        -label $r \
                        -command [list fetch_from $r]
                $prune_m add command \
                        -label $r \
                        -command [list prune_from $r]
        }
}

proc add_push_entry {r} {
        global repo_config
        set remote_m .mbar.remote
        set push_m $remote_m.push
        set enable 0
        if {![catch {set a $repo_config(remote.$r.url)}]} {
                if {![catch {set a $repo_config(remote.$r.push)}]} {
                        set enable 1
                }
        } else {
                catch {
                        set fd [open [gitdir remotes $r] r]
                        while {[gets $fd n] >= 0} {
                                if {[regexp {^Push:[ \t]*([^:]+):} $n]} {
                                        set enable 1
                                        break
                                }
                        }
                        close $fd
                }
        }

        if {$enable} {
                if {![winfo exists $push_m]} {
                        menu $push_m
                        $remote_m insert 0 cascade \
                                -label [mc "Push to"] \
                                -menu $push_m
                }

                $push_m add command \
                        -label $r \
                        -command [list push_to $r]
        }
}

proc populate_remotes_menu {} {
        global all_remotes

        foreach r $all_remotes {
                add_fetch_entry $r
                add_push_entry $r
        }
}

proc add_single_remote {name location} {
        global all_remotes repo_config
        lappend all_remotes $name

        git remote add $name $location

        # XXX: Better re-read the config so that we will never get out
        # of sync with git remote implementation?
        set repo_config(remote.$name.url) $location
        set repo_config(remote.$name.fetch) "+refs/heads/*:refs/remotes/$name/*"

        add_fetch_entry $name
        add_push_entry $name
}