--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/summarize_gff_by_attribute.R	Mon Oct 18 11:01:20 2021 +0000
@@ -0,0 +1,22 @@
+#!/usr/bin/env Rscript
+suppressPackageStartupMessages(library(rtracklayer))
+g = import(commandArgs(T)[1], format = "GFF")
+attribute_name = commandArgs(T)[2]
+
+m = mcols(g)
+AN = commandArgs(T)[2]
+## check if attribute is in gff:
+if (!AN %in% colnames(m)){
+  stop(paste0("attribute ", AN," not in input gff\n", "Available attributes are:\n", paste(colnames(m), collapse = "\n ")))
+}
+
+w = width(g)
+total_lengths = by(w, INDICES=m[,attribute_name] , sum)
+total_counts =  by(w, INDICES=m[,attribute_name] , length)
+total_length_summary = do.call(rbind,as.list(by(w, INDICES=m[,attribute_name] , summary)))
+colnames(total_length_summary)  = paste0("length.", colnames(total_length_summary))
+
+d = data.frame(attribute = names(total_counts), cbind(count = total_counts, total_length=total_lengths, length=total_length_summary))
+colnames(d)[1] = attribute_name
+d = d[order(d$total_length, decreasing = TRUE),]
+write.table(d, sep = "\t", row.names = FALSE, quote = FALSE, file = commandArgs(T)[3])