vcsh

   1 #!/bin/sh
   2
   3 [ -n "$VCSH_DEBUG" ]      && set -vx
   4 [ -z "$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 $VCSH_REPO_NAME git pull' to finish cloning.\n" 17
  67         git merge origin/master
  68 }
  69
  70 delete() {
  71         cd "$HOME" || fatal "could not enter '$HOME'" 11
  72         use
  73         info "This operation WILL DETROY DATA!"
  74         files=$(git ls-files)
  75         echo "These files will be deleted:
  76
  77 $files
  78
  79 AGAIN, THIS WILL DELETE YOUR DATA!
  80 To continue, type \"Yes, do as I say\""
  81         read answer
  82         [ "x$answer" = "xYes, do as I say" ] || exit 16
  83         for file in $files; do
  84                 rm -f $file || info "could not delete '$file', continuing with deletion"
  85         done
  86         rmdir "$GIT_DIR" || error "could not delete '$GIT_DIR'"
  87 }
  88
  89 enter() {
  90         use
  91         $SHELL
  92 }
  93
  94 git_dir_exists() {
  95         [ -d "$GIT_DIR" ] || fatal "no repository found for '$VCSH_REPO_NAME'" 12
  96 }
  97
  98 init() {
  99         [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
 100         export GIT_WORK_TREE="$HOME"
 101         mkdir -p "$GIT_WORK_TREE" || fatal "could not create '$GIT_WORK_TREE'" 50
 102         cd "$GIT_WORK_TREE" || fatal "could not enter '$GIT_WORK_TREE'" 11
 103         git init
 104         setup
 105 }
 106
 107 list() {
 108         for i in "$VCSH_BASE"/*.git; do
 109                 echo $(basename "$i" .git)
 110         done
 111 }
 112
 113 get_files() {
 114         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 115         git ls-files
 116 }
 117
 118 list_tracked() {
 119         for VCSH_REPO_NAME in $(list); do
 120                 get_files
 121         done | sort -u
 122 }
 123
 124 list_tracked_by() {
 125         use
 126         git ls-files | sort -u
 127 }
 128
 129 rename() {
 130         git_dir_exists
 131         [ -d "$GIT_DIR_NEW" ] && fatal "'$GIT_DIR_NEW' exists" 54
 132         mv -f "$GIT_DIR" "$GIT_DIR_NEW" || fatal "Could not mv '$GIT_DIR' '$GIT_DIR_NEW'" 52
 133
 134 }
 135
 136 run() {
 137         use
 138         $VCSH_EXTERNAL_COMMAND
 139 }
 140
 141 seed_gitignore() {
 142         use
 143         cd "$HOME" || fatal "could not enter '$HOME'" 11
 144         gitignores=$(for file in $(git ls-files); do
 145                 while true; do
 146                         echo $file; new="${file%/*}"
 147                         [ "$file" = "$new" ] && break
 148                         file="$new"
 149                 done;
 150         done | sort -u)
 151         tempfile=$(mktemp) || fatal "could not create tempfile" 51
 152         echo '*' > "$tempfile" || fatal "could not write to '$tempfile'" 57
 153         for gitignore in $gitignores; do
 154                 echo "$gitignore" | sed 's/^/!/' >> "$tempfile" || fatal "could not write to '$tempfile'" 57
 155                 [ -d "$gitignore" ] && { echo "$gitignore/*" | sed 's/^/!/' >> "$tempfile" || fatal "could not write to '$tempfile'" 57; }
 156         done
 157         if diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null; then
 158                 rm -f "$tempfile" || error "could not delete '$tempfile'"
 159                 exit
 160         fi
 161         if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
 162                 info "'$HOME/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'"
 163                 mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
 164                         fatal "could not move '$HOME/.gitignore.d/$VCSH_REPO_NAME' to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
 165         fi
 166         mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
 167                 fatal "could not move '$tempfile' to '$HOME/.gitignore.d/$VCSH_REPO_NAME'" 53
 168 }
 169
 170 setup() {
 171         use
 172         git config core.worktree     "$GIT_WORK_TREE"
 173         git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
 174         git config vcsh.vcsh         'true'
 175         [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ] && git add -f "$HOME/.gitignore.d/$VCSH_REPO_NAME"
 176 }
 177
 178 use() {
 179         git_dir_exists
 180         export GIT_WORK_TREE="$(git config --get core.worktree)"
 181         export VCSH_DIRECTORY="$VCSH_REPO_NAME"
 182 }
 183
 184 if [ "$1" = 'clone' ]; then
 185         [ -z $2 ] && fatal "$1: please specify a remote" 1
 186         export VCSH_COMMAND="$1"
 187         GIT_REMOTE="$2"
 188         [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
 189         export VCSH_REPO_NAME
 190         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 191 elif [ "$1" = 'delete' ] ||
 192      [ "$1" = 'enter' ] ||
 193      [ "$1" = 'init' ] ||
 194      [ "$1" = 'list-tracked-by' ] ||
 195      [ "$1" = 'rename' ] ||
 196      [ "$1" = 'run' ] ||
 197      [ "$1" = 'seed-gitignore' ] ||
 198      [ "$1" = 'setup' ]; then
 199         [ -z $2 ]                      && fatal "$1: please specify repository to work on" 1
 200         [ "$1" = 'rename' -a -z "$3" ] && fatal "$1: please specify a target name" 1
 201         [ "$1" = 'run' -a -z "$3" ]    && fatal "$1: please specify a command" 1
 202         export VCSH_COMMAND="$1"
 203         export VCSH_REPO_NAME="$2"
 204         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 205         [ "$VCSH_COMMAND" = 'rename' ]         && export GIT_DIR_NEW="$VCSH_BASE/$3.git"
 206         [ "$VCSH_COMMAND" = 'run' ] && shift 2 && export VCSH_EXTERNAL_COMMAND="$*"
 207         [ "$VCSH_COMMAND" = 'seed-gitignore' ]
 208 elif [ "$1" = 'list' ] ||
 209      [ "$1" = 'list-tracked' ]; then
 210         export VCSH_COMMAND="$1"
 211 elif [ -n "$1" ]; then
 212         export VCSH_COMMAND=run
 213         export VCSH_REPO_NAME="$1"
 214         export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
 215         [ -d $GIT_DIR ] || { help; exit 1; }
 216         shift 1
 217         export VCSH_EXTERNAL_COMMAND="git $*"
 218 else
 219         # $1 is empty, or 'help'
 220         help && exit
 221 fi
 222
 223 # Did we receive a directory instead of a name?
 224 # Mangle the input to fit normal operation.
 225 if echo $VCSH_REPO_NAME | grep -q '/'; then
 226         export GIT_DIR=$VCSH_REPO_NAME
 227         export VCSH_REPO_NAME=$(basename $VCSH_REPO_NAME .git)
 228 fi
 229
 230
 231 for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
 232 do
 233         if [ ! -d "$check_directory" ]; then
 234                 if [ -e "$check_directory" ]; then
 235                         fatal "'$check_directory' exists but is not a directory" 13
 236                 else
 237                         info "attempting to create '$check_directory'"
 238                         mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
 239                 fi
 240         fi
 241 done
 242
 243 verbose "$VCSH_COMMAND begin"
 244 export VCSH_COMMAND=$(echo $VCSH_COMMAND | sed 's/-/_/g')
 245 $VCSH_COMMAND
 246 verbose "$VCSH_COMMAND end, exiting"