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