6456 - new directory for live-blogging prototypes

I don't have layers yet in Mu. But I can still create lots of versions
of a program.

1 files changed, 81 insertions, 0 deletions

diff --git a/prototypes/browse/4-render-page.mu b/prototypes/browse/4-render-page.mu
new file mode 100644
index 00000000..bc8c6a55
--- /dev/null
+++ b/prototypes/browse/4-render-page.mu
@@ -0,0 +1,81 @@
+fn main args: (addr array (addr array byte)) -> exit-status/ebx: int {
+  var filename/eax: (addr array byte) <- first-arg args
+  var file/eax: (addr buffered-file) <- load-file filename
+  enable-screen-grid-mode
+  enable-keyboard-immediate-mode
+  {
+    render file, 5, 5, 30, 30
+    var key/eax: byte <- read-key
+    compare key, 0x71  # 'q'
+    loop-if-!=
+  }
+  enable-keyboard-type-mode
+  enable-screen-type-mode
+  exit-status <- copy 0
+}
+
+fn render in: (addr buffered-file), toprow: int, leftcol: int, botrow: int, rightcol: int {
+  clear toprow, leftcol, botrow, rightcol
+  var row/ecx: int <- copy toprow
+$line-loop:  {
+    compare row, botrow
+    break-if->=
+    var col/edx: int <- copy leftcol
+    move-cursor row, col
+    {
+      compare col, rightcol
+      break-if->=
+      var c/eax: byte <- read-byte-buffered in
+      compare c, 0xffffffff  # EOF marker
+      break-if-= $line-loop
+      # print c
+      print-byte c
+      col <- increment
+      loop
+    }  # $char-loop
+    row <- increment
+    loop
+  }  # $line-loop
+}
+
+fn clear toprow: int, leftcol: int, botrow: int, rightcol: int {
+  var row/ecx: int <- copy toprow
+  {
+    compare row, botrow
+    break-if->=
+    var col/edx: int <- copy leftcol
+    move-cursor row, col
+    {
+      compare col, rightcol
+      break-if->=
+      print-string " "
+      col <- increment
+      loop
+    }
+    row <- increment
+    loop
+  }
+}
+
+fn first-arg args-on-stack: (addr array (addr array byte)) -> out/eax: (addr array byte) {
+  var args/eax: (addr array (addr array byte)) <- copy args-on-stack
+  var result/eax: (addr addr array byte) <- index args, 1
+  out <- copy *result
+}
+
+fn load-file filename: (addr array byte) -> out/eax: (addr buffered-file) {
+  var result: (handle buffered-file)
+  {
+    var tmp1/eax: (addr handle buffered-file) <- address result
+    open filename, 0, tmp1
+  }
+  out <- lookup result
+}
+
+fn dump in: (addr buffered-file) {
+  var c/eax: byte <- read-byte-buffered in
+  compare c, 0xffffffff  # EOF marker
+  break-if-=
+  print-byte c
+  loop
+}