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type environment {
item-index: int
}
# static buffer sizes in this file:
# main-panel-hor # in characters
# item-padding-hor # in pixels
# item-padding-ver # in characters
# avatar-side # in pixels
# avatar-space-hor # in characters
# avatar-space-ver # in characters
# search-position-x # in characters
# search-space-ver # in characters
# author-name-padding-ver # in characters
# post-right-coord # in characters
# channel-offset-x # in characters
# menu-space-ver # in characters
fn initialize-environment _self: (addr environment), _items: (addr item-list) {
var self/esi: (addr environment) <- copy _self
var items/eax: (addr item-list) <- copy _items
var newest-item-a/eax: (addr int) <- get items, newest
var newest-item/eax: int <- copy *newest-item-a
var dest/edi: (addr int) <- get self, item-index
copy-to *dest, newest-item
}
fn render-environment screen: (addr screen), env: (addr environment), users: (addr array user), channels: (addr array channel), items: (addr item-list) {
clear-screen screen
render-search-input screen, env
render-channels screen, env, channels
render-item-list screen, env, items, users
render-menu screen
}
fn render-channels screen: (addr screen), env: (addr environment), _channels: (addr array channel) {
var channels/esi: (addr array channel) <- copy _channels
var y/ebx: int <- copy 2/search-space-ver
y <- add 1/item-padding-ver
var i/ecx: int <- copy 0
var max/edx: int <- length channels
{
compare i, max
break-if->=
var offset/eax: (offset channel) <- compute-offset channels, i
var curr/eax: (addr channel) <- index channels, offset
var name-ah/eax: (addr handle array byte) <- get curr, name
var name/eax: (addr array byte) <- lookup *name-ah
compare name, 0
break-if-=
set-cursor-position screen, 2/x y
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "#", 0xf/grey 0/black
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, name, 0xf/grey 0/black
y <- add 2/channel-padding
i <- increment
loop
}
}
fn render-item-list screen: (addr screen), _env: (addr environment), _items: (addr item-list), users: (addr array user) {
var env/esi: (addr environment) <- copy _env
var tmp-width/eax: int <- copy 0
var tmp-height/ecx: int <- copy 0
tmp-width, tmp-height <- screen-size screen
var screen-width: int
copy-to screen-width, tmp-width
var screen-height: int
copy-to screen-height, tmp-height
#
var y/ecx: int <- copy 2/search-space-ver
y <- add 1/item-padding-ver
var newest-item/eax: (addr int) <- get env, item-index
var i/ebx: int <- copy *newest-item
var items/esi: (addr item-list) <- copy _items
var items-data-ah/eax: (addr handle array item) <- get items, data
var _items-data/eax: (addr array item) <- lookup *items-data-ah
var items-data/edi: (addr array item) <- copy _items-data
{
compare i, 0
break-if-<
compare y, screen-height
break-if->=
var offset/eax: (offset item) <- compute-offset items-data, i
var curr-item/eax: (addr item) <- index items-data, offset
y <- render-item screen, curr-item, users, y, screen-height
i <- decrement
loop
}
var top/eax: int <- copy screen-height
top <- subtract 2/menu-space-ver
clear-rect screen, 0 top, screen-width screen-height, 0/bg
}
fn render-search-input screen: (addr screen), env: (addr environment) {
set-cursor-position 0/screen, 0x22/x=search-position-x 1/y
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "search ", 7/fg 0/bg
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "________________________________", 0xf/fg 0/bg
}
fn render-menu screen: (addr screen) {
var width/eax: int <- copy 0
var y/ecx: int <- copy 0
width, y <- screen-size screen
y <- decrement
set-cursor-position screen, 2/x, y
draw-text-rightward-from-cursor screen, " / ", width, 0/fg 0xf/bg
draw-text-rightward-from-cursor screen, " search ", width, 0xf/fg, 0/bg
draw-text-rightward-from-cursor screen, " ^f ", width, 0/fg 0xf/bg
draw-text-rightward-from-cursor screen, " next page ", width, 0xf/fg, 0/bg
draw-text-rightward-from-cursor screen, " ^b ", width, 0/fg 0xf/bg
draw-text-rightward-from-cursor screen, " previous page ", width, 0xf/fg, 0/bg
draw-text-rightward-from-cursor screen, " ^n ", width, 0/fg 0xf/bg
draw-text-rightward-from-cursor screen, " next (older) item ", width, 0xf/fg, 0/bg
draw-text-rightward-from-cursor screen, " ^p ", width, 0/fg 0xf/bg
draw-text-rightward-from-cursor screen, " previous (more recent) item ", width, 0xf/fg, 0/bg
}
fn render-item screen: (addr screen), _item: (addr item), _users: (addr array user), y: int, screen-height: int -> _/ecx: int {
var item/esi: (addr item) <- copy _item
var users/edi: (addr array user) <- copy _users
var author-index-addr/ecx: (addr int) <- get item, by
var author-index/ecx: int <- copy *author-index-addr
var author-offset/ecx: (offset user) <- compute-offset users, author-index
var author/ecx: (addr user) <- index users, author-offset
# author avatar
var author-avatar-ah/eax: (addr handle image) <- get author, avatar
var _author-avatar/eax: (addr image) <- lookup *author-avatar-ah
var author-avatar/ebx: (addr image) <- copy _author-avatar
{
compare author-avatar, 0
break-if-=
var y/edx: int <- copy y
y <- shift-left 4/log2font-height
var x/eax: int <- copy 0x20/main-panel-hor
x <- shift-left 3/log2font-width
x <- add 0x18/item-padding-hor
render-image screen, author-avatar, x, y, 0x50/avatar-side, 0x50/avatar-side
}
# channel
var channel-name-ah/eax: (addr handle array byte) <- get item, channel
var channel-name/eax: (addr array byte) <- lookup *channel-name-ah
{
var x/eax: int <- copy 0x20/main-panel-hor
x <- add 0x40/channel-offset-x
set-cursor-position screen, x y
}
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, "#", 7/grey 0/black
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, channel-name, 7/grey 0/black
# author name
var author-real-name-ah/eax: (addr handle array byte) <- get author, real-name
var author-real-name/eax: (addr array byte) <- lookup *author-real-name-ah
{
var x/ecx: int <- copy 0x20/main-panel-hor
x <- add 0x10/avatar-space-hor
set-cursor-position screen, x y
draw-text-wrapping-right-then-down-from-cursor-over-full-screen screen, author-real-name, 0xf/white 0/black
}
increment y
# text
var text-ah/eax: (addr handle array byte) <- get item, text
var _text/eax: (addr array byte) <- lookup *text-ah
var text/edx: (addr array byte) <- copy _text
var x/eax: int <- copy 0x20/main-panel-hor
x <- add 0x10/avatar-space-hor
var text-y/ecx: int <- copy y
text-y <- add 1/author-name-padding-ver
x, text-y <- draw-text-wrapping-right-then-down screen, text, x text-y, 0x70/xmax=post-right-coord screen-height, x text-y, 7/fg 0/bg
text-y <- add 2/item-padding-ver
# flush
add-to y, 6/avatar-space-ver
compare y, text-y
{
break-if-<
return y
}
return text-y
}
fn update-environment env: (addr environment), key: byte, items: (addr item-list) {
{
compare key, 0xe/ctrl-n
break-if-!=
next-item env, items
return
}
{
compare key, 0x10/ctrl-p
break-if-!=
previous-item env, items
return
}
{
compare key, 6/ctrl-f
break-if-!=
page-down env, items
return
}
{
compare key, 2/ctrl-b
break-if-!=
page-up env, items
return
}
}
fn next-item _env: (addr environment), _items: (addr item-list) {
var env/edi: (addr environment) <- copy _env
var dest/eax: (addr int) <- get env, item-index
compare *dest, 0
break-if-<=
decrement *dest
}
fn previous-item _env: (addr environment), _items: (addr item-list) {
var env/edi: (addr environment) <- copy _env
var items/esi: (addr item-list) <- copy _items
var newest-item-index-a/ecx: (addr int) <- get items, newest
var newest-item-index/ecx: int <- copy *newest-item-index-a
var dest/eax: (addr int) <- get env, item-index
compare *dest, newest-item-index
break-if->=
increment *dest
}
fn page-down _env: (addr environment), _items: (addr item-list) {
var env/edi: (addr environment) <- copy _env
var items/esi: (addr item-list) <- copy _items
var items-data-ah/eax: (addr handle array item) <- get items, data
var _items-data/eax: (addr array item) <- lookup *items-data-ah
var items-data/ebx: (addr array item) <- copy _items-data
var src/eax: (addr int) <- get env, item-index
var new-item-index/ecx: int <- copy *src
var y/edx: int <- copy 2
{
compare new-item-index, 0
break-if-<
compare y, 0x28/screen-height-minus-menu
break-if->=
var offset/eax: (offset item) <- compute-offset items-data, new-item-index
var item/eax: (addr item) <- index items-data, offset
var item-text-ah/eax: (addr handle array byte) <- get item, text
var item-text/eax: (addr array byte) <- lookup *item-text-ah
var h/eax: int <- estimate-height item-text
set-cursor-position 0/screen, 0 0
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, h, 4/fg 0/bg
y <- add h
new-item-index <- decrement
loop
}
new-item-index <- increment
var dest/eax: (addr int) <- get env, item-index
{
# HACK: make sure we make forward progress even if a single post takes up
# the whole screen.
# We can't see the rest of that single post at the moment. But at least we
# can go past it.
compare new-item-index, *dest
break-if-!=
# Don't make "forward progress" past post 0.
compare new-item-index, 0
break-if-=
new-item-index <- decrement
}
copy-to *dest, new-item-index
}
fn page-up _env: (addr environment), _items: (addr item-list) {
var env/edi: (addr environment) <- copy _env
var items/esi: (addr item-list) <- copy _items
var items-data-ah/eax: (addr handle array item) <- get items, data
var _items-data/eax: (addr array item) <- lookup *items-data-ah
var items-data/ebx: (addr array item) <- copy _items-data
var newest-item-index-a/esi: (addr int) <- get items, newest
var src/eax: (addr int) <- get env, item-index
var new-item-index/ecx: int <- copy *src
var y/edx: int <- copy 2
{
compare new-item-index, *newest-item-index-a
break-if->
compare y, 0x28/screen-height-minus-menu
break-if->=
var offset/eax: (offset item) <- compute-offset items-data, new-item-index
var item/eax: (addr item) <- index items-data, offset
var item-text-ah/eax: (addr handle array byte) <- get item, text
var item-text/eax: (addr array byte) <- lookup *item-text-ah
var h/eax: int <- estimate-height item-text
set-cursor-position 0/screen, 0 0
draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0/screen, h, 4/fg 0/bg
y <- add h
new-item-index <- increment
loop
}
new-item-index <- decrement
var dest/eax: (addr int) <- get env, item-index
copy-to *dest, new-item-index
}
# keep sync'd with render-item
fn estimate-height _message-text: (addr array byte) -> _/eax: int {
var message-text/esi: (addr array byte) <- copy _message-text
var result/eax: int <- length message-text
var remainder/edx: int <- copy 0
result, remainder <- integer-divide result, 0x40/post-width
compare remainder, 0
{
break-if-=
result <- increment
}
result <- add 2/item-padding-ver
compare result, 6/avatar-space-ver
{
break-if->
return 6/avatar-space-ver
}
return result
}
|