#!/bin/sh
# Alternative to build2 that can stop after any step. For example:
#   $ ./build3 mu.cc

set -e  # stop immediately on error

# Some environment variables that can be passed in. For example, to turn off
# optimization:
#   $ CFLAGS=-g ./build3
test "$CXX" || export CXX=c++
test "$CC" || export CC=cc
test "$CFLAGS" || export CFLAGS="-g -O2"
export CFLAGS="$CFLAGS -Wall -Wextra -ftrapv -fno-strict-aliasing"
export CXXFLAGS="-std=c++98 $CFLAGS"  # CI has an ancient version; don't expect recent dialects

# Outline:
# [0-9]*.cc -> mu.cc -> .build/*.cc -> .build/*.o -> .build/mu_bin
# (layers)   |        |              |             |
#          tangle  cleave          $CXX          $CXX

## arg parsing

# can be called with a target to stop after a partial build
#   $ ./build3 mu.cc
# can also be called with a layer to only build until
#   $ ./build3 --until 050
# scenarios:
#   ./build3              => TARGET=  UNTIL_LAYER=zzz
#   ./build3 x            => TARGET=x UNTIL_LAYER=zzz
#   ./build3 --until      => TARGET=  UNTIL_LAYER=zzz
#   ./build3 --until 050  => TARGET=  UNTIL_LAYER=050
TARGET=
UNTIL_LAYER=zzz
if [ $# -ge 1 ] && [ $1 != "--until" ]
then
  TARGET=$1
fi
if [ $# -ge 2 ] && [ $1 = "--until" ]
then
  UNTIL_LAYER=$2
fi

##

# there's two mechanisms for fast builds here:
# - if a command is quick to run, always run it but update the result only on any change
# - otherwise run it only if the output is 'older_than' the inputs
#
# avoid combining both mechanisms for a single file
# otherwise you'll see spurious messages about files being updated
# risk: a file may unnecessarily update without changes, causing unnecessary work downstream

# return 1 if $1 is older than _any_ of the remaining args
# also exit the entire script if previous invocation was to update $TARGET
older_than() {
  test $TARGET  &&  test "$last_target" = "$TARGET"  &&  exit 0
  local target=$1
  shift
  last_target=$target
  if [ ! -e $target ]
  then
#?     echo "$target doesn't exist"
    echo "updating $target" >&2
    return 0  # success
  fi
  local f
  for f in $*
  do
    if [ $f -nt $target ]
    then
      echo "updating $target" >&2
      return 0  # success
    fi
  done
  return 1  # failure
}

# redirect to $1, unless it's already identical
# no point checking for an early exit, because this usually runs in a pipeline/subshell
update() {
  if [ ! -e $1 ]
  then
    cat > $1
  else
    cat > $1.tmp
    diff -q $1 $1.tmp >/dev/null  &&  rm $1.tmp  ||  mv $1.tmp $1
  fi
}

# cp file $1 to directory $2, unless it's already identical
# also exit the entire script if previous invocation was to update $TARGET
update_cp() {
  test $TARGET  &&  test "$last_target" = "$TARGET"  &&  exit 0
  last_target=$2/$1
  if [ ! -e $2/$1 ]
  then
    cp $1 $2
  elif [ $1 -nt $2/$1 ]
  then
    cp $1 $2
  fi
}

noisy_cd() {
  cd $1
  echo "-- `pwd`" >&2
}

older_than ../../enumerate/enumerate ../../enumerate/enumerate.cc && {
  $CXX $CXXFLAGS ../../enumerate/enumerate.cc -o ../../enumerate/enumerate
}

older_than ../../tangle/tangle ../../tangle/*.cc && {
  noisy_cd ../../tangle
    # auto-generate various lists (ending in '_list' by convention) {
    # list of types
    {
      grep -h "^struct .* {" [0-9]*.cc  |sed 's/\(struct *[^ ]*\).*/\1;/'
      grep -h "^typedef " [0-9]*.cc
    }  |update type_list
    # list of function declarations, so I can define them in any order><a href="ranger.gui.displayable.html#Displayable">ranger.gui.displayable.Displayable</a>(<a href="ranger.shared.html#EnvironmentAware">ranger.shared.EnvironmentAware</a>, <a href="ranger.shared.html#FileManagerAware">ranger.shared.FileManagerAware</a>, <a href="ranger.gui.curses_shortcuts.html#CursesShortcuts">ranger.gui.curses_shortcuts.CursesShortcuts</a>)
</font></dt><dd>
<dl>
<dt><font face="helvetica, arial"><a href="ranger.gui.widgets.html#Widget">Widget</a>
</font></dt></dl>
</dd>
</dl>
 <p>
<table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section">
<tr bgcolor="#ffc8d8">
<td colspan=3 valign=bottom>&nbsp;<br>
<font color="#000000" face="helvetica, arial"><a name="Widget">class <strong>Widget</strong></a>(<a href="ranger.gui.displayable.html#Displayable">ranger.gui.displayable.Displayable</a>)</font></td></tr>
    
<tr bgcolor="#ffc8d8"><td rowspan=2><tt>&nbsp;&nbsp;&nbsp;</tt></td>
<td colspan=2><tt>The&nbsp;<a href="#Widget">Widget</a>&nbsp;class&nbsp;defines&nbsp;no&nbsp;methods&nbsp;and&nbsp;only&nbsp;exists&nbsp;for<br>
classification&nbsp;of&nbsp;widgets.<br>&nbsp;</tt></td></tr>
<tr><td>&nbsp;</td>
<td width="100%"><dl><dt>Method resolution order:</dt>
<dd><a href="ranger.gui.widgets.html#Widget">Widget</a></dd>
<dd><a href="ranger.gui.displayable.html#Displayable">ranger.gui.displayable.Displayable</a></dd>
<dd><a href="ranger.shared.html#EnvironmentAware">ranger.shared.EnvironmentAware</a></dd>
<dd><a href="ranger.shared.html#FileManagerAware">ranger.shared.FileManagerAware</a></dd>
<dd><a href="ranger.shared.html#Awareness">ranger.shared.Awareness</a></dd>
<dd><a href="ranger.gui.curses_shortcuts.html#CursesShortcuts">ranger.gui.curses_shortcuts.CursesShortcuts</a></dd>
<dd><a href="ranger.shared.settings.html#SettingsAware">ranger.shared.settings.SettingsAware</a></dd>
<dd><a href="__builtin__.html#object">__builtin__.object</a></dd>
</dl>
<hr>
Methods inherited from <a href="ranger.gui.displayable.html#Displayable">ranger.gui.displayable.Displayable</a>:<br>
<dl><dt><a name="Widget-__bool__"><strong>__bool__</strong></a> = __nonzero__(self)</dt><dd><tt>Always&nbsp;True</tt></dd></dl>

<dl><dt><a name="Widget-__contains__"><strong>__contains__</strong></a>(self, item)</dt><dd><tt>Is&nbsp;item&nbsp;inside&nbsp;the&nbsp;boundaries?<br>
item&nbsp;can&nbsp;be&nbsp;an&nbsp;iterable&nbsp;like&nbsp;[y,&nbsp;x]&nbsp;or&nbsp;an&nbsp;object&nbsp;with&nbsp;x&nbsp;and&nbsp;y&nbsp;methods.</tt></dd></dl>

<dl><dt><a name="Widget-__init__"><strong>__init__</strong></a>(self, win, env<font color="#909090">=None</font>, fm<font color="#909090">=None</font>, settings<font color="#909090">=None</font>)</dt></dl>

<dl><dt><a name="Widget-__nonzero__"><strong>__nonzero__</strong></a>(self)</dt><dd><tt>Always&nbsp;True</tt></dd></dl>

<dl><dt><a name="Widget-__str__"><strong>__str__</strong></a>(self)</dt></dl>

<dl><dt><a name="Widget-click"><strong>click</strong></a>(self, event)</dt><dd><tt>Called&nbsp;when&nbsp;a&nbsp;mouse&nbsp;key&nbsp;is&nbsp;pressed&nbsp;and&nbsp;self.<strong>focused</strong>&nbsp;is&nbsp;True.<br>
Override&nbsp;this!</tt></dd></dl>

<dl><dt><a name="Widget-contains_point"><strong>contains_point</strong></a>(self, y, x)</dt><dd><tt>Test&nbsp;whether&nbsp;the&nbsp;point&nbsp;(with&nbsp;absolute&nbsp;coordinates)&nbsp;lies<br>
within&nbsp;the&nbsp;boundaries&nbsp;of&nbsp;this&nbsp;object.</tt></dd></dl>

<dl><dt><a name="Widget-destroy"><strong>destroy</strong></a>(self)</dt><dd><tt>Called&nbsp;when&nbsp;the&nbsp;object&nbsp;is&nbsp;destroyed.<br>
Override&nbsp;this!</tt></dd></dl>

<dl><dt><a name="Widget-draw"><strong>draw</strong></a>(self)</dt><dd><tt>Draw&nbsp;the&nbsp;object.&nbsp;Called&nbsp;on&nbsp;every&nbsp;main&nbsp;iteration&nbsp;if&nbsp;visible.<br>
Containers&nbsp;should&nbsp;call&nbsp;<a href="#Widget-draw">draw</a>()&nbsp;on&nbsp;their&nbsp;contained&nbsp;objects&nbsp;here.<br>
Override&nbsp;this!</tt></dd></dl>

<dl><dt><a name="Widget-finalize"><strong>finalize</strong></a>(self)</dt><dd><tt>Called&nbsp;after&nbsp;every&nbsp;displayable&nbsp;is&nbsp;done&nbsp;drawing.<br>
Override&nbsp;this!</tt></dd></dl>

<dl><dt><a name="Widget-poke"><strong>poke</strong></a>(self)</dt><dd><tt>Called&nbsp;before&nbsp;drawing,&nbsp;even&nbsp;if&nbsp;invisible</tt></dd></dl>

<dl><dt><a name="Widget-press"><strong>press</strong></a>(self, key)</dt><dd><tt>Called&nbsp;when&nbsp;a&nbsp;key&nbsp;is&nbsp;pressed&nbsp;and&nbsp;self.<strong>focused</strong>&nbsp;is&nbsp;True.<br>
Override&nbsp;this!</tt></dd></dl>

<dl><dt><a name="Widget-resize"><strong>resize</strong></a>(self, y, x, hei<font color="#909090">=None</font>, wid<font color="#909090">=None</font>)</dt><dd><tt>Resize&nbsp;the&nbsp;widget</tt></dd></dl>

<hr>
Data and other attributes inherited from <a href="ranger.shared.html#EnvironmentAware">ranger.shared.EnvironmentAware</a>:<br>
<dl><dt><strong>env</strong> = None</dl>

<hr>
Data and other attributes inherited from <a href="ranger.shared.html#FileManagerAware">ranger.shared.FileManagerAware</a>:<br>
<dl><dt><strong>fm</strong> = None</dl>

<hr>
Data descriptors inherited from <a href="ranger.shared.html#Awareness">ranger.shared.Awareness</a>:<br>
<dl><dt><strong>__dict__</strong></dt>
<dd><tt>dictionary&nbsp;for&nbsp;instance&nbsp;variables&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<dl><dt><strong>__weakref__</strong></dt>
<dd><tt>list&nbsp;of&nbsp;weak&nbsp;references&nbsp;to&nbsp;the&nbsp;object&nbsp;(if&nbsp;defined)</tt></dd>
</dl>
<hr>
Methods inherited from <a href="ranger.gui.curses_shortcuts.html#CursesShortcuts">ranger.gui.curses_shortcuts.CursesShortcuts</a>:<br>
<dl><dt><a name="Widget-addnstr"><strong>addnstr</strong></a>(self, *args)</dt></dl>

<dl><dt><a name="Widget-addstr"><strong>addstr</strong></a>(self, *args)</dt></dl>

<dl><dt><a name="Widget-color"><strong>color</strong></a>(self, *keys)</dt><dd><tt>Change&nbsp;the&nbsp;colors&nbsp;from&nbsp;now&nbsp;on.</tt></dd></dl>

<dl><dt><a name="Widget-color_at"><strong>color_at</strong></a>(self, y, x, wid, *keys)</dt><dd><tt>Change&nbsp;the&nbsp;colors&nbsp;at&nbsp;the&nbsp;specified&nbsp;position</tt></dd></dl>

<dl><dt><a name="Widget-color_reset"><strong>color_reset</strong></a>(self)</dt><dd><tt>Change&nbsp;the&nbsp;colors&nbsp;to&nbsp;the&nbsp;default&nbsp;colors</tt></dd></dl>

<hr>
Data and other attributes inherited from <a href="ranger.shared.settings.html#SettingsAware">ranger.shared.settings.SettingsAware</a>:<br>
<dl><dt><strong>settings</strong> = {}</dl>

</td></tr></table></td></tr></table>
</body></html>