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-rw-r--r--utils/graphs/commits-over-time/README.md16
-rwxr-xr-xutils/graphs/commits-over-time/genhtml.tcl96
2 files changed, 112 insertions, 0 deletions
diff --git a/utils/graphs/commits-over-time/README.md b/utils/graphs/commits-over-time/README.md
new file mode 100644
index 0000000..b28019e
--- /dev/null
+++ b/utils/graphs/commits-over-time/README.md
@@ -0,0 +1,16 @@
+This Tcl script is what I used in order to generate the graph you
+can find at http://antirez.com/news/98. It's really quick & dirty, more
+a trow away program than anything else, but probably could be reused or
+modified in the future in order to visualize other similar data or an
+updated version of the same data.
+
+The usage is trivial:
+
+ ./genhtml.tcl > output.html
+
+The generated HTML is quite broken but good enough to grab a screenshot
+from the browser. Feel free to improve it if you got time / interest.
+
+Note that the code filtering the tags, and the hardcoded branch name, does
+not make the script, as it is, able to analyze a different repository.
+However the changes needed are trivial.
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>}