add gen.sh and some better logging

1 files changed, 57 insertions, 0 deletions

diff --git a/snag/gen.sh b/snag/gen.sh
new file mode 100755
index 0000000..3e420f1
--- /dev/null
+++ b/snag/gen.sh
@@ -0,0 +1,57 @@
+#!/bin/bash
+
+bin="snag"
+libs=""
+builddir="objs"
+PREFIX="/usr"
+
+while [ "$1" ]; do
+	case "$1" in
+		-*) exit 1 ;;
+	esac
+	shift
+done
+
+CFLAGS=${CFLAGS:-""}
+
+CFLAGS_RELEASE="$CFLAGS -O2"
+CFLAGS_DEBUG="$CFLAGS -Wall -g -DDEBUG=1"
+
+write() {
+    echo "$@" >> build.ninja
+}
+
+echo "$CFLAGS_DEBUG $(pkg-config --cflags $libs 2>/dev/null)" | tr ' ' '\n' > compile_flags.txt
+rm -f build.ninja
+
+write "builddir = $builddir"
+write "libs = $(pkg-config --libs $libs 2>/dev/null)"
+
+write 'rule link'
+write '  description = LD $out'
+write '  command = gcc $libs $in -o $out'
+for target in $(echo "debug release"); do
+    eval write "cflags_$target = \$CFLAGS_${target^^} $(pkg-config --cflags $libs 2>/dev/null)"
+
+    write "rule cc-$target"
+    write '  deps = gcc'
+    write '  depfile = $out.d'
+    write '  description = CC $out'
+    write "  command = gcc -MD -MF \$out.d \$cflags_$target -c \$in -o \$out"
+
+
+    files="$(find . -name '*.c')"
+    sedstr=$(printf 's,^\./\(.*\)\.c$,%s\/%s\/\\1.o,g' ${builddir} ${target})
+    ofiles=$(echo "$files" | sed ${sedstr})
+
+    for f in $files; do
+        of=$(echo $f | sed ${sedstr})
+        write "build $of: cc-$target $f"
+    done
+    write "build $builddir/$target/$bin: link $(echo $ofiles)"
+    write "build $target: phony $builddir/$target/$bin"
+done
+
+write "default release"
+
+echo "Wrote ./build.ninja file"