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diff --git a/scripts/gen-changelog b/scripts/gen-changelog
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+#!/bin/sh
+# Usage: gen-changelog [comittish]
+# Reads all the commits since comittish and produces changelog entries in
+# our style as best as it can, appendning them to CHANGELOG.md.  If it
+# encounters a git error it won't modify CHANGELOG.md
+# @iarna uses this as the first step in producing changelogs for a release.
+(node $(npm prefix)/scripts/changelog.js "$@"; cat CHANGELOG.md) > new.md && mv new.md CHANGELOG.md