1 files changed, 96 insertions, 0 deletions
diff --git a/utils/graphs/commits-over-time/genhtml.tcl b/utils/graphs/commits-over-time/genhtml.tcl
new file mode 100755
index 0000000..c4b4e09
--- /dev/null
+++ b/utils/graphs/commits-over-time/genhtml.tcl
@@ -0,0 +1,96 @@
+#!/usr/bin/env tclsh
+
+# Load commits history as "sha1 unixtime".
+set commits [exec git log unstable {--pretty="%H %at"}]
+set raw_tags [exec git tag]
+
+# Load all the tags that are about stable releases.
+foreach tag $raw_tags {
+    if {[string match v*-stable $tag]} {
+        set tag [string range $tag 1 end-7]
+        puts $tag
+    }
+    if {[regexp {^[0-9]+.[0-9]+.[0-9]+$} $tag]} {
+        lappend tags $tag
+    }
+}
+
+# For each tag, create a list of "name unixtime"
+foreach tag $tags {
+    set taginfo [exec git log $tag -n 1 "--pretty=\"$tag %at\""]
+    set taginfo [string trim $taginfo {"}]
+    lappend labels $taginfo
+}
+
+# For each commit, check the amount of code changed and create an array
+# mapping the commit to the number of lines affected.
+foreach c $commits {
+    set stat [exec git show --oneline --numstat [lindex $c 0]]
+    set linenum 0
+    set affected 0
+    foreach line [split $stat "\n"] {
+        incr linenum
+        if {$linenum == 1 || [string match *deps/* $line]} continue
+        if {[catch {llength $line} numfields]} continue
+        if {$numfields == 0} continue
+        catch {
+            incr affected [lindex $line 0]
+            incr affected [lindex $line 1]
+        }
+    }
+    set commit_to_affected([lindex $c 0]) $affected
+}
+
+set base_time [lindex [lindex $commits end] 1]
+puts [clock format $base_time]
+
+# Generate a graph made of HTML DIVs.
+puts {<html>
+<style>
+.box {
+    position:absolute;
+    width:10px;
+    height:5px;
+    border:1px black solid;
+    background-color:#44aa33;
+    opacity: 0.04;
+}
+.label {
+    position:absolute;
+    background-color:#dddddd;
+    font-family:helvetica;
+    font-size:12px;
+    padding:2px;
+    color:#666;
+    border:1px #aaa solid;
+    border-radius: 5px;
+}
+#outer {
+    position:relative;
+    width:1500;
+    height:500;
+    border:1px #aaa solid;
+}
+</style>
+<div id="outer">
+}
+foreach c $commits {
+    set sha [lindex $c 0]
+    set t [expr {([lindex $c 1]-$base_time)/(3600*24*2)}]
+    set affected [expr $commit_to_affected($sha)]
+    set left $t
+    set height [expr {log($affected)*20}]
+    puts "<div class=\"box\" style=\"left:$left; bottom:0; height:$height\"></div>"
+}
+
+set bottom -30
+foreach l $labels {
+    set name [lindex $l 0]
+    set t [expr {([lindex $l 1]-$base_time)/(3600*24*2)}]
+    set left $t
+    if {$left < 0} continue
+    incr bottom -20
+    if  {$bottom == -210} {set bottom -30}
+    puts "<div class=\"label\" style=\"left:$left; bottom:$bottom\">$name</div>"
+}
+puts {</div></html>}