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Автоматическая генерация сообщений к коммитам с информацией о затронутых файлах.
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‎REFERENCES.md

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# Git
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- [Git - Viewing the Commit History](https://git-scm.com/book/en/v2/Git-Basics-Viewing-the-Commit-History)
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- [Git - git-status Documentation](https://git-scm.com/docs/git-status)
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- [Git - git-remote Documentation](https://git-scm.com/docs/git-remote)
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- [Git - git-push Documentation](https://git-scm.com/docs/git-push)
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- [Git - git-rev-parse Documentation](https://git-scm.com/docs/git-rev-parse)
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- [Git - git-merge-base Documentation](https://git-scm.com/docs/git-merge-base)
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- [Git - git-filter-branch Documentation](https://git-scm.com/docs/git-filter-branch)
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- [version control - git and empty folders - Stack Overflow](https://stackoverflow.com/questions/1767165/git-and-empty-folders)
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- [What does the term "porcelain" mean in Git? - Stack Overflow](https://stackoverflow.com/questions/6976473/what-does-the-term-porcelain-mean-in-git)
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- [What does git rev-parse do? - Stack Overflow](https://stackoverflow.com/questions/15798862/what-does-git-rev-parse-do)
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- [Make an existing Git branch track a remote branch? - Stack Overflow](https://stackoverflow.com/questions/520650/make-an-existing-git-branch-track-a-remote-branch)
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- [git branch - Git: How do I list only local branches? - Stack Overflow](https://stackoverflow.com/questions/12370714/git-how-do-i-list-only-local-branches)
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- [Git: want to iterate through all commits on branch, and list files in each commit - Stack Overflow](https://stackoverflow.com/questions/5953767/git-want-to-iterate-through-all-commits-on-branch-and-list-files-in-each-commi)
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- [Git: How to find a deleted file in the project commit history? - Stack Overflow](https://stackoverflow.com/questions/7203515/git-how-to-find-a-deleted-file-in-the-project-commit-history)
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- [git - How to list all the files in a commit? - Stack Overflow](https://stackoverflow.com/questions/424071/how-to-list-all-the-files-in-a-commit)
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- [How to Batch Update Git Commit Messages](https://davidwalsh.name/update-git-commit-messages)
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- [Rewriting Git Commit Messages](http://www.burtonini.com/blog/2018/03/06/rewriting-git-commit-messages/)
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- [Edit an old commit message with git filter-branch - Stack Overflow](https://stackoverflow.com/questions/43603080/edit-an-old-commit-message-with-git-filter-branch)
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- [git commit - Purging file from Git repo failed, unable to create new backup - Stack Overflow](https://stackoverflow.com/questions/6403601/purging-file-from-git-repo-failed-unable-to-create-new-backup)
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# bash
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- [Bash Shell Find Out If a Variable Is Empty Or Not - nixCraft](https://www.cyberciti.biz/faq/unix-linux-bash-script-check-if-variable-is-empty/)
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- [bash - Test if a command outputs an empty string - Stack Overflow](https://stackoverflow.com/questions/12137431/test-if-a-command-outputs-an-empty-string)
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- [linux - How to compare strings in Bash - Stack Overflow](https://stackoverflow.com/questions/2237080/how-to-compare-strings-in-bash)
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- [awk - print columns with text and spaces | Unix Linux Forums | Shell Programming and Scripting](https://www.unix.com/shell-programming-and-scripting/245398-awk-print-columns-text-spaces.html)
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- [bash case statements evaluate to strings - Stack Overflow](https://stackoverflow.com/questions/2283640/bash-case-statements-evaluate-to-strings)
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- [Introduction to Bash arrays | Opensource.com](https://opensource.com/article/18/5/you-dont-know-bash-intro-bash-arrays)
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- [shell - How to concatenate string variables in Bash - Stack Overflow](https://stackoverflow.com/questions/4181703/how-to-concatenate-string-variables-in-bash)
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- [Bash array usage cheatsheet.](https://gist.github.com/magnetikonline/0ca47c893de6a380c87e4bdad6ae5cf7)
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- [bash - Create array in loop from number of arguments - Stack Overflow](https://stackoverflow.com/questions/15420790/create-array-in-loop-from-number-of-arguments)
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- [Is there a way of reading the last element of an array with bash? - Unix & Linux Stack Exchange](https://unix.stackexchange.com/questions/198787/is-there-a-way-of-reading-the-last-element-of-an-array-with-bash)
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- [The weird, wondrous world of Bash arrays – Robert Aboukhalil – Medium](https://medium.com/@robaboukhalil/the-weird-wondrous-world-of-bash-arrays-a86e5adf2c69)
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- [bash - readarray (or pipe) issue - Unix & Linux Stack Exchange](https://unix.stackexchange.com/questions/136206/readarray-or-pipe-issue)
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- [Reading output of a command into an array in Bash - Stack Overflow](https://stackoverflow.com/questions/11426529/reading-output-of-a-command-into-an-array-in-bash/32931403)
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- [How do you process the output of a command in the shell line-by-line? - Stack Overflow](https://stackoverflow.com/questions/3113005/how-do-you-process-the-output-of-a-command-in-the-shell-line-by-line)
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- [bash: convert '\n' delimited strings into array - Stack Overflow](https://stackoverflow.com/questions/24628076/bash-convert-n-delimited-strings-into-array)
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- [bash - Are <=,>=, <,>, ==, !=, &&, and || used for arithmetic expressions or conditional expressions? - Unix & Linux Stack Exchange](https://unix.stackexchange.com/questions/270591/are-and-used-for-arithmetic-expressions-or-conditiona)
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- [A bash function that takes argument like other languages? - Unix & Linux Stack Exchange](https://unix.stackexchange.com/questions/122632/a-bash-function-that-takes-argument-like-other-languages)
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- [Checking for empty string in Bash « timmurphy.org](https://timmurphy.org/2010/05/19/checking-for-empty-string-in-bash/)
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- [How to use arithmetic in an if statement for Bash - Stack Overflow](https://stackoverflow.com/questions/43443159/how-to-use-arithmetic-in-an-if-statement-for-bash)

‎commit-msg-generator.sh

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#!/bin/bash
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#set -x # echo on
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# Usage:
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# $ ./commit-msg-generator.sh -p=~/repo
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# $ ./commit-msg-generator.sh --projects=~/repo
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# $ ./commit-msg-generator.sh --default
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function buildFilesListString {
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local -n files_list=$1
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local len=${#files_list[@]}
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for (( i=0; i<len; i++ )); do
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file_name="${files_list[$i]}"
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if (( i < len-1 )); then
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echo -n "'$file_name', "
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else
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echo -n "'$file_name'"
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fi
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done
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}
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projects_dir=.
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for i in "$@"; do
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case $i in
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-p=*|--projects=*)
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projects_dir="${i#*=}"
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eval projects_dir=$projects_dir
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shift # past argument=value
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;;
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--default)
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projects_dir=.
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shift # past argument with no value
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;;
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*)
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# unknown option
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;;
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esac
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done
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cd "$projects_dir"
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pwd
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git for-each-ref --format='%(refname:short)' refs/heads/ | while read branch_name; do
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#echo "branch_name = $branch_name"
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for commit_id in $(git rev-list "$branch_name"); do
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#echo "commit_id = $commit_id"
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declare -a all_files=()
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SAVEIFS=$IFS # Save current IFS
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IFS=$'\n' # Change IFS to new line.
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all_files=( $(git show --pretty="" --name-status "$commit_id") )
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IFS=$SAVEIFS # Restore IFS
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declare -a all=()
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declare -a added=()
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declare -a modified=()
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declare -a deleted=()
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for (( i=0; i<${#all_files[@]}; i++ )); do
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file_name_and_status="${all_files[$i]}"
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#echo "file_name_and_status = $file_name_and_status"
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file_status=$(echo "$file_name_and_status" | awk -F"\t" '{ print $1 }')
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file_name=$(echo "$file_name_and_status" | awk -F"\t" '{ print $2 }')
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#echo "file_name = $file_name, file_status = $file_status"
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all+=( "$file_name" )
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case "$file_status" in
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('A')
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added+=( "$file_name" )
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#echo "added[-1] = ${added[-1]}"
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#echo "added = ${added[@]}"
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;;
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('M')
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modified+=( "$file_name" )
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#echo "modified[-1] = ${modified[-1]}"
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#echo "modified = ${modified[@]}"
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;;
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('D')
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deleted+=( "$file_name" )
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#echo "deleted[-1] = ${deleted[-1]}"
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#echo "deleted = ${deleted[@]}"
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;;
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esac
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done
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commit_message=""
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if [ -n "$all" ]; then
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commit_message="FILES: $(buildFilesListString all).\n"
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fi
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if [ -n "$added" ]; then
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if [ -n "$commit_message" ]; then commit_message="${commit_message}\n"; fi
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commit_message="${commit_message}ADDED: $(buildFilesListString added)."
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fi
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if [ -n "$modified" ]; then
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if [ -n "$commit_message" ]; then commit_message="${commit_message}\n"; fi
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commit_message="${commit_message}MODIFIED: $(buildFilesListString modified)."
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fi
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if [ -n "$deleted" ]; then
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if [ -n "$commit_message" ]; then commit_message="${commit_message}\n"; fi
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commit_message="${commit_message}DELETED: $(buildFilesListString deleted)."
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fi
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#echo "$commit_message"
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#echo "//---------------------------------------------------------------------"
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git filter-branch -f --msg-filter \
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"if test \$GIT_COMMIT = '$commit_id'
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then
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echo \"$commit_message\"; else cat
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fi"
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done
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done

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