vcsh

   1 #!/bin/sh
   2
   3 [ -n "$VCSH_DEBUG" ]      && set -x
   4 [ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
   5 [ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
   6
   7 SELF=$(basename $0)
   8
   9 help() {
  10         echo "usage: $SELF <args>
  11
  12    clone <remote> \\
  13          [<repo>]       Clone from an existing repository
  14    help                 Display this help text
  15    delete               Delete an existing repository
  16    enter                Enter repository; spawn new $SHELL
  17    init <repo>          Initialize a new repository
  18    list                 List all repositories
  19    rename <repo> \\
  20           <newname>     Rename repository
  21    run <repo> \\
  22        <command>        Use this repository
  23
  24    seed-gitignore \\
  25    <repo>               Seed .gitignore.d/<repo> from git ls-files
  26    setup                Set up repository with recommended settings
  27
  28    <repo> <git command> Special command that allows you to run git commands
  29                         directly without having to type so much ;)" >&2
  30 }
  31
  32 debug() {
  33         [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
  34 }
  35
  36 verbose() {
  37         if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
  38 }
  39
  40 fatal() {
  41         echo "$SELF: fatal: $1" >&2
  42         exit $2
  43 }
  44
  45 error() {
  46         echo "$SELF: error: $1" >&2
  47 }
  48
  49 info() {
  50         echo "$SELF: info: $1"
  51 }
  52
  53 clone() {
  54         init
  55         git remote add origin "$GIT_REMOTE"
  56         git config branch.master.remote origin
  57         git config branch.master.merge  refs/heads/master
  58         git fetch
  59         for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
  60                 [ -e "$object" ] &&
  61                         error "'$object' exists." &&
  62                         VCSH_CONFLICT=1;
  63         done
  64         [ "$VCSH_CONFLICT" = '1' ] &&
  65                 fatal "will stop after fetching and not try to merge!
  66   Once this situation has been resolved, run 'vcsh run $VCSH_REPO_NAME git pull' to finish cloning.\n" 17
  67         git merge origin/master
  68 }
  69
  70 delete() {
  71         old_dir="$PWD"
  72         cd "$HOME"
  73         use
  74         info "This operation WILL DETROY DATA!"
  75         files=$(git ls-files)
  76         echo "These files will be deleted:
  77
  78 $files
  79
  80 AGAIN, THIS WILL DELETE YOUR DATA!
  81 To continue, type \"Yes, do as I say\""
  82         read answer
  83         [ "x$answer" = "xYes, do as I say" ] || exit 16
  84         for file in $files; do
  85                 rm -f $file || info "could not delete '$file', continuing with deletion"
  86         done
  87         rmdir "$GIT_DIR" || info "could not delete '$GIT_DIR'"
  88         cd "$old_dir"
  89 }
  90
  91 enter() {
  92         use
  93         $SHELL
  94 }
  95
  96 git_dir_exists() {
  97         [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
  98 }
  99
 100 init() {
 101         [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
 102         export GIT_WORK_TREE="$HOME"
 103         mkdir -p "$GIT_WORK_TREE"
 104         cd "$GIT_WORK_TREE" || fatal "could not enter '$GIT_WORK_TREE'" 11
 105         git init
 106         setup
 107 }
 108
 109 list() {
 110         for i in "$VCSH_BASE"/*.git; do
 111                 echo $(basename "$i" .git)
 112         done
 113 }
 114
 115 rename() {
 116         git_dir_exists
 117         [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
 118         mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
 119
 120 }
 121
 122 run() {
 123         use
 124         $VCSH_EXTERNAL_COMMAND
 125 }
 126
 127 seed_gitignore() {
 128         use
 129         # Switching directory as this has to be executed from $HOME to be of any use.
 130         # Going back into old directory at the end in case `vcsh use` is reactivated.
 131         old_dir="$PWD"
 132         cd "$HOME"
 133         gitignores=$(for file in $(git ls-files); do
 134                 while true; do
 135                         echo $file; new="${file%/*}"
 136                         [ "$file" = "$new" ] && break
 137                         file="$new"
 138                 done;
 139         done | sort -u)
 140         tempfile=$(mktemp) || fatal "could not create tempfile" 51
 141         echo '*' > "$tempfile"
 142         for gitignore in $gitignores; do
 143                 echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
 144                 [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
 145         done
 146         diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
 147                 rm -f "$tempfile" &&
 148                 exit
 149         if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
 150                 info "'$HOME/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'"
 151                 mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
 152                         fatal "could not move '$HOME/.gitignore.d/$VCSH_REPO_NAME' to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
 153         fi
 154         mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
 155                 fatal "could not move '$tempfile' to '$HOME/.gitignore.d/$VCSH_REPO_NAME'" 53
 156         cd "$old_dir"
 157 }
 158
 159 setup() {
 160         use
 161         git config core.worktree     "$GIT_WORK_TREE"
 162         git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
 163         git config vcsh.vcsh         'true'
 164         touch   "$HOME/.gitignore.d/$VCSH_REPO_NAME"
 165         git add "$HOME/.gitignore.d/$VCSH_REPO_NAME"
 166 }
 167
 168 use() {
 169         git_dir_exists
 170         export GIT_WORK_TREE="$(git config --get core.worktree)"
 171         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
 172 }
 173
 174 if [ "$1" = 'clone' ]; then
 175         [ -z $2 ] && fatal "$1: please specify a remote" 1
 176         export VCSH_COMMAND="$1"
 177         GIT_REMOTE="$2"
 178         [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
 179         export VCSH_REPO_NAME
 180         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 181 elif [ "$1" = 'delete' ] ||
 182      [ "$1" = 'enter' ] ||
 183      [ "$1" = 'init' ] ||
 184      [ "$1" = 'rename' ] ||
 185      [ "$1" = 'run' ] ||
 186      [ "$1" = 'seed-gitignore' ] ||
 187      [ "$1" = 'setup' ]; then
 188         [ -z $2 ]                      && fatal "$1: please specify repository to work on" 1
 189         [ "$1" = 'rename' -a -z "$3" ] && fatal "$1: please specify a target name" 1
 190         [ "$1" = 'run' -a -z "$3" ]    && fatal "$1: please specify a command" 1
 191         export VCSH_COMMAND="$1"
 192         export VCSH_REPO_NAME="$2"
 193         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 194         [ "$VCSH_COMMAND" = 'rename' ]         && export GIT_DIR_NEW="$VCSH_BASE/$3.git"
 195         [ "$VCSH_COMMAND" = 'run' ] && shift 2 && export VCSH_EXTERNAL_COMMAND="$@"
 196         [ "$VCSH_COMMAND" = 'seed-gitignore' ] && export VCSH_COMMAND='seed_gitignore'
 197 elif [ "$1" = 'list' ]; then
 198         export VCSH_COMMAND="$1"
 199 elif [ -n "$1" ]; then
 200         export VCSH_COMMAND=run
 201         export VCSH_REPO_NAME="$1"
 202         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 203         [ -d $GIT_DIR ] || { help; exit 1; }
 204         shift 1
 205         export VCSH_EXTERNAL_COMMAND="git $*"
 206 else
 207         # $1 is empty, or 'help'
 208         help && exit
 209 fi
 210
 211 for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
 212 do
 213         if [ ! -d "$check_directory" ]; then
 214                 if [ -e "$check_directory" ]; then
 215                         fatal "'$check_directory' exists but is not a directory" 13
 216                 else
 217                         info "attempting to create '$check_directory'"
 218                         mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
 219                 fi
 220         fi
 221 done
 222
 223 verbose "$VCSH_COMMAND begin"
 224 $VCSH_COMMAND
 225 verbose "$VCSH_COMMAND end, exiting"