1 files changed, 72 insertions, 32 deletions

diff --git a/ship/build b/ship/build
index 6c26e6f3..486f4bed 100755
--- a/ship/build
+++ b/ship/build
@@ -2,67 +2,107 @@
 set -euf
 
 ## SYNOPSIS
-# build compile SRCFILE DSTFILE
-# build deps SRCFILE
+# [debug=true] build compile SRCFILE DSTFILE
+# [debug=true] build deps SRCFILE...
 build() {
   case "$1" in
     compile) build_compile "$2" "$3";;
-    deps) build_deps "$2";;
+    deps) shift; build_deps "$@";;
     *) echo "build: $1: bad command" >&2; return 23;;
   esac
 }
 
+# usage: debug_script VARNAME [DESCRIPTION]
+debug_script() {
+  if test "${debug-false}" = true; then
+    printf '====== %s%s\n%s\n' \
+        "$1" \
+        "${2+" ($2)"}" \
+        "$(eval echo \"\$$1\" | nl -b a)" >&2
+  fi
+}
+
 ## build directives
+build_info_directive='#@info'
 build_include_directive='#@include \([0-9A-Za-z]\+\)'
 
+input_parser="\
+s:^ *\([0-9]\+\) "$build_info_directive"$:build_info \1:
+s:^ *\([0-9]\+\) "$build_include_directive"$:build_include \1 \2:
+t
+s:^ *\([0-9]\+\) .*:echo \1p:"
+debug_script input_parser
+
+## usage: build_include LINENO LIBNAME
+build_include() { cat<<EOF
+$1a\\
+# begin $2
+$1r$(build_resolve $2)
+$1a\\
+# end $2
+EOF
+}
+
+## usage: build_info LINENO
+build_info() { cat<<EOF
+$1a\\
+# this file was generated by //ship/build\\
+#   date: $(date -u --rfc-3339=s)\\
+#   version: $(git rev-parse HEAD)
+EOF
+}
+
 ## usage: build_compile SRCFILE DSTFILE
 build_compile() {
-  cp "$1" "$2"
+  srcfile="$(cat "$1")"
+  debug_script srcfile 'SRCFILE'
 
-  while needs_compilation "$2"; do
-    script="$(make_sedscript_maker_shellscript "$2" | sh)"
-    sed -n "$script" "$2" >"$2.tmp"
-    mv "$2.tmp" "$2"
+  while needs_compilation "$srcfile"; do
+    script="$(make_sedscript_maker_shellscript "$srcfile")"
+    srcfile="$(echo "$srcfile" | sed -n "$script")"
+    debug_script srcfile 'sed sedscript srcfile'
   done
 
+  echo "$srcfile" > "$2"
   chmod +x "$2"
 }
 
-## usage: needs_compilation SRCFILE
+## usage: needs_compilation SHELLSCRIPT
 # Returns true if SRCFILE contains compilation directives.
 needs_compilation() {
-  grep -q "^$build_include_directive$" "$1"
+  echo "$1" |
+      grep -q "^\\($build_include_directive\\|$build_info_directive\\)$"
 }
 
 ## usage: make_sedscript_maker_shellscript SRCFILE
 # Print a shellscript that creates a sedscript that resolves all the build
 # directives in SRCFILE.
 make_sedscript_maker_shellscript() {
-  echo 'set -euf'
-  deps="$(build_deps "$1")"
-  for lib in $deps; do
-    echo "_build_include_$(basename $lib)=$lib"
-  done
-  nl -b a -s ' ' "$1" |
-  sed '
-    s:^ *::
-    s:^\([0-9]\+\) '"$build_include_directive"'$:\1a\\\\\
-# BEGIN \2\
-      \1r\$_build_include_\2\
-      \1a\\\\\
-# END \2:
-    s:^\([0-9]\+\) .*:\1p:
-  
-    1s:^:echo ":
-    $s:$:":
-  '
+  sedscript_generator="$(echo "$1" | nl -b a -s ' ' | sed "$input_parser")"
+  debug_script sedscript_generator 'sed input_parser srcfile'
+
+  sedscript="$(eval "$sedscript_generator")"
+  debug_script sedscript 'eval sedscript_generator'
+
+  echo "$sedscript"
 }
 
-## usage: build_deps SRCFILE
+## usage: build_deps SRCFILE...
+# Print all the dependencies of SRCFILE... (in alphabetic order) to stdout.
 build_deps() {
-  for libname in $(sed -n 's:^'"$build_include_directive"'$:\1:p' "$1"); do
-    build_resolve "$libname"
-  done
+  while test $# -gt 0; do
+    deps="$(
+      for f; do
+        for d in $(sed -n 's:^'"$build_include_directive"'$:\1:p' "$f"); do
+          build_resolve $d
+        done
+      done
+    )"
+    set -- $deps
+    if test $# -gt 0; then
+      echo "$deps"
+    fi
+  done | sort | uniq
 }
 
 ## usage: build_resolve LIBNAME