1 files changed, 76 insertions, 0 deletions
diff --git a/bin/dpp b/bin/dpp
new file mode 100755
index 0000000..f25c092
--- /dev/null
+++ b/bin/dpp
@@ -0,0 +1,76 @@
+#!/bin/sh -euf
+#
+# DPP - Bonus shell implementation.
+#
+# Copyright (c) 2026 Dylan Araps
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+
+: "${DPP_EOF_MARKER:=___DPPEOFMARKER___}"
+: "${DPP_SHELL:=/bin/sh}"
+
+{
+  echo "#!$DPP_SHELL"
+  echo "# This file has been generated by dylanaraps/dpp."
+  echo "(set -euo pipefail 2>/dev/null) && set -eo pipefail || set -eu"
+  echo "export DPP_VERSION=1.0.1"
+  echo "export DPP_LEVEL=\$((DPP_LEVEL + 1))"
+  echo "set -- $*"
+  echo "${DPP_INCLUDE:+. \""$DPP_INCLUDE"\"}"
+
+  while IFS= read -r l; do case $l in
+    "${DPP_BLOCK:=!!}"*)
+      case ${b:-0} in 2)
+        echo "$DPP_EOF_MARKER"
+        b=0
+      esac
+
+      l=${l#"$DPP_BLOCK"}
+
+      case $l in
+          '') b=$((!b)) ;;
+        " "*) b=0 l=${l#?} ;;
+           *) b=0 ;;
+      esac
+
+      echo "$l"
+    ;;
+
+    *)
+      case $l in *\\) l=$l\\; esac
+
+      case ${b:-0} in 0)
+      	echo "\${DPP_CAT:=cat} << $DPP_EOF_MARKER"
+        b=2
+      esac
+
+      echo "$l"
+  esac done
+
+  case $b in
+    1) echo "error: DPP_BLOCK not closed" >&2; exit 1 ;;
+    2) echo "$DPP_EOF_MARKER" ;;
+  esac
+
+} | case ${0##*/} in
+  dpp-compile) cat ;;
+            *) "$DPP_SHELL" ;;
+esac
+