6488

1 files changed, 161 insertions, 0 deletions

diff --git a/prototypes/browse/26-headers/main.mu b/prototypes/browse/26-headers/main.mu
new file mode 100644
index 00000000..ec573e9a
--- /dev/null
+++ b/prototypes/browse/26-headers/main.mu
@@ -0,0 +1,161 @@
+fn main args: (addr array (addr array byte)) -> exit-status/ebx: int {
+  # initialize fs from args[1]
+  var filename/eax: (addr array byte) <- first-arg args
+  var file-state-storage: file-state
+  var fs/esi: (addr file-state) <- address file-state-storage
+  init-file-state fs, filename
+  #
+  enable-screen-grid-mode
+  enable-keyboard-immediate-mode
+  # initialize screen state from screen size
+  var screen-position-state-storage: screen-position-state
+  var screen-position-state/eax: (addr screen-position-state) <- address screen-position-state-storage
+  init-screen-position-state screen-position-state
+  normal-text
+  {
+    render fs, screen-position-state
+    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 fs: (addr file-state), state: (addr screen-position-state) {
+  start-drawing state
+  render-normal fs, state
+}
+
+fn render-normal fs: (addr file-state), state: (addr screen-position-state) {
+    var newline-seen?/esi: boolean <- copy 0  # false
+$render-normal:loop: {
+    # if done-drawing?(state) break
+    var done?/eax: boolean <- done-drawing? state
+    compare done?, 0  # false
+    break-if-!=
+    #
+    var c/eax: byte <- next-char fs
+    # if (c == EOF) break
+    compare c, 0xffffffff  # EOF marker
+    break-if-=
+    # if (c == newline)
+    compare c, 0xa  # newline
+    {
+      break-if-!=
+      # if it's the first newline, buffer it
+      compare newline-seen?, 0
+      {
+        break-if-!=
+        newline-seen? <- copy 1  # true
+        loop $render-normal:loop
+      }
+      # otherwise render two newlines
+      {
+        break-if-=
+        add-char state, 0xa  # newline
+        add-char state, 0xa  # newline
+        newline-seen? <- copy 0  # false
+        loop $render-normal:loop
+      }
+    }
+    # if c is unprintable (particularly a '\r' CR), skip it
+    compare c, 0x20
+    loop-if-<
+    # If there's a newline buffered and c is a space, print the buffered
+    # newline (hard newline).
+    # If there's a newline buffered and c is not a newline or space, print a
+    # space (soft newline).
+    compare newline-seen?, 0  # false
+$render-normal:flush-buffered-newline: {
+      break-if-=
+      newline-seen? <- copy 0  # false
+      {
+        compare c, 0x20
+        break-if-!=
+        add-char state, 0xa  # newline
+        break $render-normal:flush-buffered-newline
+      }
+      add-char state, 0x20  # space
+      # fall through to print c
+    }
+    # if (c == '*') switch to bold
+    compare c, 0x2a  # '*'
+    {
+      break-if-!=
+      start-bold
+        render-until-asterisk fs, state
+      normal-text
+      loop $render-normal:loop
+    }
+    # if (c == '_') switch to bold
+    compare c, 0x5f  # '_'
+    {
+      break-if-!=
+      start-color 0xec, 7  # 236 = darkish gray
+      start-bold
+        render-until-underscore fs, state
+      reset-formatting
+      start-color 0xec, 7  # 236 = darkish gray
+      loop $render-normal:loop
+    }
+    #
+    add-char state, c
+    #
+    loop
+  }
+}
+
+fn render-until-asterisk fs: (addr file-state), state: (addr screen-position-state) {
+  {
+    # if done-drawing?(state) break
+    var done?/eax: boolean <- done-drawing? state
+    compare done?, 0  # false
+    break-if-!=
+    #
+    var c/eax: byte <- next-char fs
+    # if (c == EOF) break
+    compare c, 0xffffffff  # EOF marker
+    break-if-=
+    # if (c == '*') break
+    compare c, 0x2a  # '*'
+    break-if-=
+    #
+    add-char state, c
+    #
+    loop
+  }
+}
+
+fn render-until-underscore fs: (addr file-state), state: (addr screen-position-state) {
+  {
+    # if done-drawing?(state) break
+    var done?/eax: boolean <- done-drawing? state
+    compare done?, 0  # false
+    break-if-!=
+    #
+    var c/eax: byte <- next-char fs
+    # if (c == EOF) break
+    compare c, 0xffffffff  # EOF marker
+    break-if-=
+    # if (c == '_') break
+    compare c, 0x5f  # '_'
+    break-if-=
+    #
+    add-char state, c
+    #
+    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 normal-text {
+  reset-formatting
+  start-color 0xec, 7  # 236 = darkish gray
+}