├── README.md
└── code-age.sh


/README.md:
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 1 | # code-age
 2 | 
 3 | This is a script that calculates the average age of your code lines using `git blame` and math.
 4 | 
 5 | ## Installation
 6 | 
 7 | Clone this repo somewhere on your computer:
 8 | 
 9 | ```
10 | git clone git@github.com:draperunner/code-age.git
11 | ```
12 | 
13 | Create a symbolic link to the `code-age.sh` to some bin folder that's on your path.
14 | 
15 | ```
16 | cd /usr/local/bin
17 | ln -s /path/to/projects/code-age/code-age.sh code-age
18 | ```
19 | 
20 | Now you can run `code-age` anywhere you'd like. Keep it updated by running `git pull` in the repo.
21 | 


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/code-age.sh:
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 1 | #!/usr/bin/env bash
 2 | 
 3 | if [[ ! -d .git ]]; then
 4 |   echo "This is not a git directory!"
 5 |   exit 1
 6 | fi
 7 | 
 8 | NOW=$(date +"%s")
 9 | SEC_IN_DAY=86400
10 | DAYS_IN_YEAR=365
11 | 
12 | TOTAL_AGE_SEC=0
13 | TOTAL_LINES=0
14 | 
15 | CURRENT_FILE=1
16 | TOTAL_FILES=$(git ls-files | wc -l)
17 | 
18 | echo "Calculating code age ..."
19 | 
20 | for FILE in $(git ls-files); do
21 |   PERC=$((100 * CURRENT_FILE / TOTAL_FILES))
22 |   echo -e "\e[1A\e[K$PERC %\t$FILE"
23 | 
24 |   for LINE in $(git blame "$FILE" --date=unix -c | awk -v FS='\t' '{ print $3 }'); do
25 |     AGE_SEC=$((NOW - LINE))
26 |     TOTAL_AGE_SEC=$((TOTAL_AGE_SEC + AGE_SEC))
27 |     TOTAL_LINES=$((TOTAL_LINES + 1))
28 |   done
29 | 
30 |   CURRENT_FILE=$((CURRENT_FILE + 1))
31 | done
32 | 
33 | AVG_AGE_SEC=$((TOTAL_AGE_SEC / TOTAL_LINES))
34 | AVG_AGE_DAYS=$((AVG_AGE_SEC / SEC_IN_DAY))
35 | AVG_AGE_YEARS=$((AVG_AGE_DAYS / DAYS_IN_YEAR))
36 | 
37 | if [ $AVG_AGE_YEARS == 0 ]; then
38 |   echo "$AVG_AGE_DAYS days"
39 | else
40 |   DAYS_REMAINDER="$((AVG_AGE_DAYS - $((AVG_AGE_YEARS * DAYS_IN_YEAR))))"
41 |   echo "$AVG_AGE_YEARS years, $DAYS_REMAINDER days"
42 | fi
43 | 


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