From 258cb7979e364483d6910acef474377decc9fcb8 Mon Sep 17 00:00:00 2001
From: Jake Zimmerman <zimmerman.jake@gmail.com>
Date: Thu, 11 Jan 2018 00:44:19 -0800
Subject: [PATCH] Add --filter flag

The normal approach to filtering would be to just use Unix pipes.
That strategy doesn't work well here, because the histogram max width is
determined by the line with the most commits. So if one file has been
changed 1000 times and all the rest are orders of magnitude smaller,
the bar chart will have a lot of unused space.
---
 git-heatmap | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/git-heatmap b/git-heatmap
index 8391a12..daf6b35 100755
--- a/git-heatmap
+++ b/git-heatmap
@@ -31,6 +31,11 @@ while [[ $# -gt 0 ]]; do
       shift
       shift
       ;;
+    -f|--filter)
+      FILTER="$2"
+      shift
+      shift
+      ;;
     -h)
       cat <<EOF
 Heatmap of oft-edited files.
@@ -44,6 +49,8 @@ Options:
   -b <branch>, --base <branch>  Compare relative to <branch>. If on <branch>,
                                 show heatmap for entire repo. [default: master]
   -c <char>, --char <char>      Use <char> to draw the bars. [default: █]
+  -f <cmd>, --filter <cmd>      Filter output through <cmd> before creating the
+                                the histogram.
   -h                            Show this message.
 EOF
       exit
@@ -59,6 +66,7 @@ LIMIT=${LIMIT:-30}
 REVIEW_BASE=${REVIEW_BASE:-master}
 CHAR=${CHAR:-█}
 WIDTH=${WIDTH:-60}
+FILTER=${FILTER:-cat -}
 
 files() {
   # https://stackoverflow.com/questions/7577052/
@@ -76,6 +84,7 @@ color_name() {
 
 filter() {
   grep '.' | \
+    eval "$FILTER" | \
     sort | \
     uniq -c | \
     sort -nr | \