From a9feda9383fe4c25f5021e13bb4a5810d8dfa27f Mon Sep 17 00:00:00 2001
From: MorganGeek <wattiez.morgan@gmail.com>
Date: Thu, 23 Jul 2020 07:18:03 +0200
Subject: [PATCH] add git utilities to display stats of a repo

---
 Brewfile                      |   1 +
 dot_scripts/git-overview.py   | 166 ++++++++++++++++++++++++++++++++++
 dot_scripts/pythondeps.sh     |   4 +
 dot_scripts/symbolic_links.sh |   1 +
 4 files changed, 172 insertions(+)
 create mode 100755 dot_scripts/git-overview.py

diff --git a/Brewfile b/Brewfile
index d0e25df..b811b42 100644
--- a/Brewfile
+++ b/Brewfile
@@ -200,3 +200,4 @@ brew "git-delta"
 brew "sn0int"
 brew "prettier"
 brew "switchaudio-osx"
+brew "git-extras"
diff --git a/dot_scripts/git-overview.py b/dot_scripts/git-overview.py
new file mode 100755
index 0000000..ce1fb33
--- /dev/null
+++ b/dot_scripts/git-overview.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+"""
+Origin : https://github.com/qznc/dot/blob/master/bin/git-overview
+Gather a general overview from a git repository.
+It shall identify the major contributors within a project.
+It shall identify interesting parts in the code.
+"""
+
+from subprocess import check_output
+from datetime import datetime
+from os.path import splitext
+
+_CMD_AUTHOR_HISTORY = 'git log --date=iso --format="format:%an;%ad;%G?;%H"'
+_CMD_FILELIST = "git ls-files"
+_CMD_COMMIT_FILES_CHANGES = "git diff-tree --no-commit-id --name-only -r "
+
+from collections import namedtuple
+
+FileInfo = namedtuple("FileInfo", "path,authors,commits,firstc,lastc")
+
+
+def read_log_data():
+    total_commits = 0
+    authors = dict()
+    files = dict()
+    raw = check_output(_CMD_AUTHOR_HISTORY, shell=True, universal_newlines=True)
+    for line in raw.split("\n"):
+        total_commits += 1
+        name, dt, signed, hash = line.split(";")
+        if not name in authors:
+            authors[name] = (datetime.now(), datetime(1900, 1, 1), 0)
+        first, last, count = authors[name]
+        when = datetime.strptime(dt[:-6], "%Y-%m-%d %H:%M:%S")
+        if when < first:
+            first = when
+        if when > last:
+            last = when
+        authors[name] = (first, last, count + 1)
+        craw = check_output(
+            _CMD_COMMIT_FILES_CHANGES + hash, shell=True, universal_newlines=True
+        )
+        for file in craw.split("\n"):
+            if file == "":
+                continue
+            if file in files:
+                fi = files[file]
+            else:
+                files[file] = fi = dict(
+                    path=file,
+                    authors=set(),
+                    commits=0,
+                    firstc=datetime.now(),
+                    lastc=datetime(1900, 1, 1),
+                )
+            fi["authors"].add(name)
+            fi["commits"] += 1
+            if when < fi["firstc"]:
+                fi["firstc"] = when
+            if when > fi["lastc"]:
+                fi["lastc"] = when
+    return authors, files, total_commits
+
+
+def readable_duration(dur):
+    """Given a timedelta object, returns a human-readable string"""
+    if dur.days > 0:
+        if dur.days > 365 * 2:
+            return "%d years" % (dur.days / 365)
+        elif dur.days > 30 * 5:
+            return "%d months" % (dur.days / 30)
+        else:
+            return "%d days" % (dur.days)
+    else:
+        if dur.seconds > 60 * 60 * 2:
+            return "%d hours" % (dur.seconds / 60 / 60)
+        elif dur.seconds > 60 * 5:
+            return "%d minutes" % (dur.seconds / 60)
+        else:
+            return "%d seconds" % (dur.seconds)
+
+
+def partition_by_extension(fileinfo):
+    pd = dict()
+    meta = dict()
+    total_filecount = 0
+    total_extfilecount = 0
+    for path, fi in fileinfo.items():
+        total_filecount += 1
+        root, ext = splitext(path)
+        if not ext:
+            continue
+        total_extfilecount += 1
+        if not ext in pd:
+            pd[ext] = dict()
+            meta[ext] = dict(filecount=0)
+        pd[ext][path] = fi
+        meta[ext]["filecount"] += 1
+    return pd, meta, total_filecount, total_extfilecount
+
+
+def print_top_committers(authorinfo, total_commits):
+    authors = sorted(authorinfo.items(), key=lambda x: x[1][2], reverse=True)
+    total_authors = len(authors)
+    committed = 0
+    print("Top Committers (of %d authors):" % (total_authors))
+    for author, info in authors:
+        first, last, count = info
+        readable_last = last.strftime("%Y-%m-%d")
+        if count == 1:
+            print("%-20s    1 commit on %s" % (author, readable_last))
+        else:
+            duration = readable_duration(last - first)
+            print(
+                "%-20s %4d commits during %s until %s"
+                % (author, count, duration, readable_last)
+            )
+        committed += count
+        if committed > total_commits * 0.8:
+            break
+    print(
+        " together these authors have 80+%% of the commits (%d/%d)"
+        % (committed, total_commits)
+    )
+
+
+def print_important_files(fileinfo):
+    files = list(fileinfo.values())
+    files.sort(key=lambda x: x["commits"])
+    print("Files with most commits:")
+    for x in files[-5:]:
+        readable_last = x["lastc"].strftime("%Y-%m-%d")
+        duration = readable_duration(x["lastc"] - x["firstc"])
+        print(
+            "%4d commits: %-20s during %s until %s"
+            % (x["commits"], x["path"], duration, readable_last)
+        )
+    print()
+    files.sort(key=lambda x: len(x["authors"]))
+    print("Files with most authors:")
+    for x in files[-5:]:
+        print("%2d authors: %-20s" % (len(x["authors"]), x["path"]))
+
+
+def print_extension_info(fileinfo):
+    pfileinfo, extinfo, total_filecount, total_extfilecount = partition_by_extension(
+        fileinfo
+    )
+    pf = [(e, i) for e, i in pfileinfo.items()]
+    pf.sort(key=lambda x: extinfo[x[0]]["filecount"], reverse=True)
+    print("By file extension:")
+    fc = 0
+    for ext, info in pf:
+        c = extinfo[ext]["filecount"]
+        print("%5s: %d files" % (ext, extinfo[ext]["filecount"]))
+        fc += c
+        if fc > total_filecount * 0.8:
+            break
+    print(" together these make up 80+%% of the files (%d/%d)" % (fc, total_filecount))
+
+
+authorinfo, fileinfo, total_commits = read_log_data()
+print_top_committers(authorinfo, total_commits)
+print()
+print_important_files(fileinfo)
+print()
+print_extension_info(fileinfo)
diff --git a/dot_scripts/pythondeps.sh b/dot_scripts/pythondeps.sh
index fe5eb7d..7d71923 100755
--- a/dot_scripts/pythondeps.sh
+++ b/dot_scripts/pythondeps.sh
@@ -12,6 +12,10 @@ Darwin)
     export PATH="$PATH:/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/bin/:/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/bin:/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/bin:/usr/local/opt/python/bin/"
     ;;
 esac
+if ! test -f "/usr/bin/python2" || ! command -v python2 &>/dev/null; then
+    sudo ln -snf /usr/bin/python /usr/bin/python2
+fi
+
 echo "Upgrading pip"
 sudo pip install --upgrade pip
 echo "Pip installing stuff"
diff --git a/dot_scripts/symbolic_links.sh b/dot_scripts/symbolic_links.sh
index fa4397b..a02cc3b 100755
--- a/dot_scripts/symbolic_links.sh
+++ b/dot_scripts/symbolic_links.sh
@@ -10,6 +10,7 @@ ln -snf "$HOME/Code/dotfiles/dot_gitconfig" "$HOME/.gitconfig"
 ln -snf "$HOME/Code/dotfiles/dot_macos" "$HOME/.macos"
 ln -snf "$HOME/Code/dotfiles/dot_scripts" "$HOME/.scripts"
 ln -snf "$HOME/Code/dotfiles/dot_scripts/checkci.sh" /usr/local/bin/checkci
+ln -snf "$HOME/Code/dotfiles/dot_scripts/git-overview.py" /usr/local/bin/git-overview # via https://github.com/qznc/dot/blob/master/bin/git-overview
 ln -snf "$HOME/Code/dotfiles/dot_scripts/pre-commit-verify-committer.sh" /usr/local/bin/pre-commit-verify-committer
 ln -snf "$HOME/Code/dotfiles/dot_vimrc" "$HOME/.vimrc"
 # custom linters