;tools: start using just, a possible replacement for make and bake

justfile

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+# * project task scripts managed with https://github.com/casey/just.
+# This hopes to gradually replace Makefile and bake.
+
+@help:
+    just -lu
+
+@check:
+    just --fmt --unstable --check
+
+@fmt:
+    just -q check || just --fmt --unstable
+
+# ** hledger version numbers
+
+# First 0-2 parts of a dotted version number.
+@versionMajorPart VER:
+    echo {{ VER }} | sed -E 's/([[:digit:]]+(\.[[:digit:]]+)?).*/\1/'
+
+# Third part of a dotted version number, if any.
+@versionMinorPart VER:
+    echo {{ VER }} | sed -E -e 's/^[[:digit:]]+(\.[[:digit:]]+(\.)?)?//' -e 's/^([[:digit:]]+).*/\1/'
+
+# Fourth part of a dotted version number, if any.
+@versionFourthPart VER:
+    echo {{ VER }} | sed -E -e 's/^[[:digit:]]+(\.[[:digit:]]+(\.[[:digit:]]+(\.)?))//' -e 's/^([[:digit:]]+).*/\1/'
+
+# Does this dotted version number have a .99 third part and no fourth part ?
+@versionIsDev VER:
+    V={{ VER }}
+    test "$(versionMinorPart "$V")" = 99 -a -z "$(versionFourthPart "$V")"
+
+# Does this dotted version number have a .99 third part and a fourth part ?
+@versionIsPreview VER:
+    V={{ VER }}
+    test "$(versionMinorPart "$V")" = 99 -a -n "$(versionFourthPart "$V")"
+
+# Increment a major version number to the next.
+@majorVersionIncrement VER:
+    python3 -c "print($1 + 0.01)"
+
+# Appropriate release branch name for the given version number.
+@versionReleaseBranch VER:
+    #!/bin/bash
+    V={{ VER }}
+    MAJOR=$(versionMajorPart "$V")
+    if versionIsDev "$V"; then
+      echo "$V is not a releasable version" >&2
+      exit 1
+    elif versionIsPreview "$V"; then
+      echo "$(majorVersionIncrement "$MAJOR")-branch"
+    else
+      echo "$MAJOR-branch"
+    fi