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+# Where everything is, and where the output goes.
+#
+# Every path is a variable with a default, and the defaults assume the layout
+# these repositories are developed in: each project cloned beside the others,
+# and this one among them. Nothing here reaches outside those clones, so a
+# different arrangement needs only this file changed.
+#
+# Override any of them in the environment:
+#
+#   OUT=/tmp/my-run sh pipeline/run.sh
+#
+# shellcheck shell=sh
+
+# this repository
+WRITERS=${WRITERS:-$(cd "$(dirname "$0")/.." && pwd)}
+
+# the sibling repositories, by their own names. A clone puts each under its
+# short name; where they sit relative to each other is the only local fact.
+SIBLINGS=${SIBLINGS:-$(cd "$WRITERS/.." && pwd)}
+OCDA_LIB=${OCDA_LIB:-$SIBLINGS/sisudoc-ocda-lib}
+SSP_READER=${SSP_READER:-$SIBLINGS/sisudoc-ssp-reader}
+DB_READER=${DB_READER:-$SIBLINGS/sisudoc-ocda-db-reader}
+
+# the abstraction artefacts to read: a directory holding .ssp files, and for
+# each of them a .ocda.db and, where there is one, a .sisupod beside it. This
+# is what spine writes with --abstraction --ocda-db --pod2; see pipeline/README.
+ARTEFACTS=${ARTEFACTS:-}
+
+# where the output goes. One directory per stage, so a run can be looked at.
+OUT=${OUT:-./pipeline-out}
+
+# the tools a pdf needs. Absent, the typst stage is skipped and says so.
+TYPST=${TYPST:-typst}
+
+# how many documents to run. Empty means all of them; a number takes the first
+# n, which is what to use while looking at something.
+LIMIT=${LIMIT:-}