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#!/bin/sh
# Alternative to build1 that tries to avoid redoing redundant work.
# Also splits compilation into multiple .cc files (see 'cleave' below).
# Faster than build1 for recompiling after small changes.
#
# For details on the basic form of this script, see https://notabug.org/akkartik/basic-build.

set -e  # stop immediately on error

# Some environment variables that can be passed in. For example, to turn off
# optimization:
#   $ CFLAGS=-g ./build2
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"

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

# can also be called with a layer to only build until
#   $ ./build2 --until 050
UNTIL_LAYER=${2:-zzz}

# 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
older_than() {
  local target=$1
  shift
  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
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
}

update_cp() {
  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 $CFLAGS 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
    grep -h "^[^ #].*) {" [0-9]*.cc  |sed 's/ {.*/;/'  |update function_list
    # list of code files to compile
    ls [0-9]*.cc  |grep -v "\.test\.cc$"  |sed 's/.*/#include "&"/'  |update file_list
    # list of test files to compile
    ls [0-9]*.test.cc  |sed 's/.*/#include "&"/'  |update test_file_list
    # list of tests to run
    grep -h "^[[:space:]]*void test_" [0-9]*.cc  |sed 's/^\s*void \(.*\)() {$/\1,/'  |update test_list
    # }
    # Now that we have all the _lists, compile 'tangle'
    $CXX $CFLAGS boot.cc -o tangle
  noisy_cd ..  # no effect; just to show us returning to the parent directory
}

LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER  |grep '\.cc$')
older_than mu.cc $LAYERS enumerate/enumerate tangle/tangle && {
  # no update here; rely on 'update' calls downstream
  ./tangle/tangle $LAYERS  > mu.cc
}

older_than cleave/cleave cleave/cleave.cc && {
  $CXX $CFLAGS cleave/cleave.cc -o cleave/cleave
  rm -rf .build
}

mkdir -p .build
# auto-generate function declarations, so I can define them in any order
# functions start out unindented, have all args on the same line, and end in ') {'
#
#                                      \/ ignore methods
grep -h "^[^[:space:]#].*) {$" mu.cc  |grep -v ":.*("  |sed 's/ {.*/;/'  |update .build/function_list
# auto-generate list of tests to run
grep -h "^\s*void test_" mu.cc  |sed 's/^\s*void \(.*\)() {.*/\1,/'  |update .build/test_list
grep -h "^\s*void test_" mu.cc  |sed 's/^\s*void \(.*\)() {.*/"\1",/'  |update .build/test_name_list
mkdir -p .build/termbox
update_cp termbox/termbox.h .build/termbox

older_than mu_bin mu.cc *_list cleave/cleave termbox/* && {
  ./cleave/cleave mu.cc .build
  noisy_cd .build
    # create the list of global variable declarations from the corresponding definitions
    grep ';' global_definitions_list  |sed 's/[=(].*/;/'  |sed 's/^[^\/# ]/extern &/'  |sed 's/^extern extern /extern /'  |update global_declarations_list
    for f in mu_*.cc
    do
      older_than `echo $f  |sed 's/\.cc$/.o/'` $f header global_declarations_list function_list test_list && {
        $CXX $CFLAGS -c $f
      }
    done
  noisy_cd ../termbox
    older_than utf8.o utf8.c && {
      $CC $CFLAGS -c utf8.c
    }
    older_than termbox.o termbox.c termbox.h input.inl output.inl bytebuffer.inl && {
      $CC $CFLAGS -c termbox.c
    }
    older_than libtermbox.a *.o && {
      ar rcs libtermbox.a *.o
    }
  noisy_cd ..
  $CXX $CFLAGS .build/*.o termbox/libtermbox.a -o .build/mu_bin
  cp .build/mu_bin .
}

## [0-9]*.mu -> core.mu

MU_LAYERS=$(./enumerate/enumerate --until $UNTIL_LAYER  |grep '\.mu$') || exit 0  # ok if no .mu files
cat $MU_LAYERS  |update core.mu

exit 0

# scenarios considered:
#   0 status when nothing needs updating
#   no output when nothing needs updating
#     no output for mu.cc when .mu files modified
#     touch mu.cc but don't modify it; no output on second build
#     touch a .cc layer but don't modify it; no output on second build
#   only a single layer is recompiled when changing a C++ function
#   stop immediately after failure in tangle
&nbsp;is&nbsp;hereby&nbsp;granted,&nbsp;provided&nbsp;that&nbsp;the&nbsp;above<br> #&nbsp;copyright&nbsp;notice&nbsp;and&nbsp;this&nbsp;permission&nbsp;notice&nbsp;appear&nbsp;in&nbsp;all&nbsp;copies.<br> #<br> #&nbsp;THE&nbsp;SOFTWARE&nbsp;IS&nbsp;PROVIDED&nbsp;"AS&nbsp;IS"&nbsp;AND&nbsp;THE&nbsp;AUTHOR&nbsp;DISCLAIMS&nbsp;ALL&nbsp;WARRANTIES<br> #&nbsp;WITH&nbsp;REGARD&nbsp;TO&nbsp;THIS&nbsp;SOFTWARE&nbsp;INCLUDING&nbsp;ALL&nbsp;IMPLIED&nbsp;WARRANTIES&nbsp;OF<br> #&nbsp;MERCHANTABILITY&nbsp;AND&nbsp;FITNESS.&nbsp;IN&nbsp;NO&nbsp;EVENT&nbsp;SHALL&nbsp;THE&nbsp;AUTHOR&nbsp;BE&nbsp;LIABLE&nbsp;FOR<br> #&nbsp;ANY&nbsp;SPECIAL,&nbsp;DIRECT,&nbsp;INDIRECT,&nbsp;OR&nbsp;CONSEQUENTIAL&nbsp;DAMAGES&nbsp;OR&nbsp;ANY&nbsp;DAMAGES<br> #&nbsp;WHATSOEVER&nbsp;RESULTING&nbsp;FROM&nbsp;LOSS&nbsp;OF&nbsp;USE,&nbsp;DATA&nbsp;OR&nbsp;PROFITS,&nbsp;WHETHER&nbsp;IN&nbsp;AN<br> #&nbsp;ACTION&nbsp;OF&nbsp;CONTRACT,&nbsp;NEGLIGENCE&nbsp;OR&nbsp;OTHER&nbsp;TORTIOUS&nbsp;ACTION,&nbsp;ARISING&nbsp;OUT&nbsp;OF<br> #&nbsp;OR&nbsp;IN&nbsp;CONNECTION&nbsp;WITH&nbsp;THE&nbsp;USE&nbsp;OR&nbsp;PERFORMANCE&nbsp;OF&nbsp;THIS&nbsp;SOFTWARE.</tt></p> <p> <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section"> <tr bgcolor="#aa55cc"> <td colspan=3 valign=bottom>&nbsp;<br> <font color="#ffffff" face="helvetica, arial"><big><strong>Package Contents</strong></big></font></td></tr> <tr><td bgcolor="#aa55cc"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td> <td width="100%"><table width="100%" summary="list"><tr><td width="25%" valign=top><a href="ranger.gui.widgets.browsercolumn.html">browsercolumn</a><br> <a href="ranger.gui.widgets.browserview.html">browserview</a><br> </td><td width="25%" valign=top><a href="ranger.gui.widgets.console.html">console</a><br> <a href="ranger.gui.widgets.console_mode.html">console_mode</a><br> </td><td width="25%" valign=top><a href="ranger.gui.widgets.pager.html">pager</a><br> <a href="ranger.gui.widgets.statusbar.html">statusbar</a><br> </td><td width="25%" valign=top><a href="ranger.gui.widgets.taskview.html">taskview</a><br> <a href="ranger.gui.widgets.titlebar.html">titlebar</a><br> </td></tr></table></td></tr></table><p> <table width="100%" cellspacing=0 cellpadding=2 border=0 summary="section"> <tr bgcolor="#ee77aa"> <td colspan=3 valign=bottom>&nbsp;<br> <font color="#ffffff" face="helvetica, arial"><big><strong>Classes</strong></big></font></td></tr> <tr><td bgcolor="#ee77aa"><tt>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</tt></td><td>&nbsp;</td> <td width="100%"><dl> <dt><font face="helvetica, arial"><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="builtins.html#object">builtins.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-__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, keylist<font color="#909090">=None</font>, *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, keylist<font color="#909090">=None</font>, *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> = &lt;ranger.ext.openstruct.OpenStruct object at 0x7f6a9067fbd0&gt;</dl> </td></tr></table></td></tr></table> </body></html>