Adding lines or other geoms to a ggplot by calling a custom function

Sometimes you generate lots of ggplots of a similar kind, e.g. visualizations of different timeseries. Then you want to highlight some dates where something special had happened and you want to show that the value you are plotting changed at these date... The post Adding lines or other geoms to a ggplot by calling a custom function first appeared on R-bloggers.
http://dlvr.it/S3XGMj

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