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Minor formatting updates
[code/vcsh.git] / vcsh
diff --git a/vcsh b/vcsh
index c4423fdb1ae72fd8b27166643d1bd9ea98731f7b..a6d0106cd7fac58429cf7070c08e26ba66bdbf2f 100755 (executable)
--- a/vcsh
+++ b/vcsh
 #!/bin/sh
 
-#set -x
+[ -n "$VCSH_DEBUG" ]      && set -x
+[ -z "$XDG_CONFIG_HOME" ] && XDG_CONFIG_HOME="$HOME/.config"
+[ -z "$VCSH_BASE" ]       && VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
 
 SELF=$(basename $0)
 
-[ -z $XDG_CONFIG_HOME ] && XDG_CONFIG_HOME="$HOME/.config"
-for check_directory in $XDG_CONFIG_HOME $XDG_CONFIG_HOME/vcsh $XDG_CONFIG_HOME/vcsh/repo.d
-do
-       if [ ! -d $check_directory ]; then
-               if [ -e $check_directory ]; then
-                       echo "$SELF: error: $check_directory exists but is not a directory" >&2
-                       exit 2
-               else
-                       mkdir $check_directory || (echo "$SELF: error: could not create $check_directory" >&2; exit 2)
-               fi
-       fi
-done
-
-VCSH_BASE="$XDG_CONFIG_HOME/vcsh/repo.d"
-
 help() {
        echo "usage: $SELF <args>
 
-   help           Display this help
+   clone <remote> \\
+         [<repo>]       Clone from an existing repository
+   help                 Display this help text
+   delete               Delete an existing repository
+   enter                Enter repository; spawn new $SHELL
+   init <repo>          Initialize a new repository
+   list                 List all repositories
+   run <repo> \\
+       <command>        Use this repository
+
+   seed-gitignore \\
+   <repo>               Seed .gitignore.d/<repo> from git ls-files
+   setup                Set up repository with recommended settings
+
+   <repo> <git command> Special command that allows you to run git commands
+                        directly without having to type so much ;)" >&2
+}
 
-   list           List all repos
+debug() {
+       [ -n "$VCSH_DEBUG" ] && echo "$SELF: debug: $@"
+}
 
-   use <repo>     Use this repository
-   run <repo>
-       <command>  Use this repository
+verbose() {
+       if [ -n "$VCSH_DEBUG" ] || [ -n "$VCSH_VERBOSE" ]; then echo "$SELF: verbose: $@"; fi
+}
 
-   init           Initialize a new repository
-   clone <remote>
-         [<repo>] Clone from an existing repository
+fatal() {
+       echo "$SELF: fatal: $1" >&2
+       exit $2
+}
 
-   exit           Exit vcsh mode" >&2
+error() {
+       echo "$SELF: error: $1" >&2
 }
 
-use() {
-       REPO_NAME="$1"
-       GIT_DIR="$VCSH_BASE/$REPO_NAME.git"
+info() {
+       echo "$SELF: info: $1"
+}
 
-       if [ ! -d "$GIT_DIR" ]; then
-               echo E: no repository found for "$REPO_NAME" >&2
-               return 2
-       fi
+clone() {
+       init
+       git remote add origin "$GIT_REMOTE"
+       git config branch.master.remote origin
+       git config branch.master.merge  refs/heads/master
+       git fetch
+       for object in $(git ls-tree -r origin/master | awk '{print $4}'); do
+               [ -e "$object" ] &&
+                       error "'$object' exists." &&
+                       VCSH_CONFLICT=1;
+       done
+       [ "$VCSH_CONFLICT" = '1' ] &&
+               fatal "will stop after fetching and not try to merge!
+  Once this situation has been resolved, run 'vcsh run $VCSH_REPO_NAME git pull' to finish cloning.\n" 17
+       git merge origin/master
+}
 
-       export GIT_DIR
-       export GIT_WORK_TREE="$(git config --get core.worktree)"
-       export VCSH_DIRECTORY="$REPO_NAME"
+delete() {
+       old_dir="$PWD"
+       cd "$HOME"
+       use
+       info "This operation WILL DETROY DATA!"
+       files=$(git ls-files)
+       echo "These files will be deleted:
+
+$files
+
+AGAIN, THIS WILL DELETE YOUR DATA!
+To continue, type \"Yes, do as I say\""
+       read answer
+       [ "x$answer" = "xYes, do as I say" ] || exit 16
+       for file in $files; do
+               rm -f $file || info "could not delete '$file', continuing with deletion"
+       done
+       rm -rf "$GIT_DIR" || info "could not delete '$GIT_DIR'"
+       cd "$old_dir"
+}
+
+enter() {
+       use
+       $SHELL
 }
 
 init() {
-       [[ -e $GIT_DIR ]] &&
-               echo "$SELF: fatal: $GIT_DIR exists" &&
-               return 21
+       [ ! -e "$GIT_DIR" ] || fatal "'$GIT_DIR' exists" 10
        export GIT_WORK_TREE="$HOME"
-       mkdir -p $GIT_WORK_TREE
-       cd $GIT_WORK_TREE ||
-               (echo "$SELF: fatal: could not enter $GIT_WORK_TREE" &&
-                exit 20) || exit 20
-       cd $GIT_WORK_TREE
+       mkdir -p "$GIT_WORK_TREE"
+       cd "$GIT_WORK_TREE" || fatal "could not enter '$GIT_WORK_TREE'" 11
+       cd "$GIT_WORK_TREE"
        git init
-       git config core.worktree $GIT_WORK_TREE
+       setup
 }
 
-leave() {
-       unset GIT_DIR
-       unset GIT_WORK_TREE
-       unset VCSH_DIRECTORY
+list() {
+       for i in "$VCSH_BASE"/*.git; do
+               echo $(basename "$i" .git)
+       done
 }
 
-if [ "$1" = 'help' ] || [ $# -eq 0 ]; then
-       help
-       [ "$1" = 'help' ]
-       exit $?
+run() {
+       use
+       $VCSH_EXTERNAL_COMMAND
+}
 
-elif [ "$1" = 'list' ]; then
-       for i in $VCSH_BASE/*.git; do
-               echo $(basename $i .git)
+seed_gitignore() {
+       use
+       # Switching directory as this has to be executed from $HOME to be of any use.
+       # Going back into old directory at the end in case `vcsh use` is reactivated.
+       old_dir="$PWD"
+       cd "$HOME"
+       gitignores=$(for file in $(git ls-files); do
+               while true; do
+                       echo $file; new="${file%/*}"
+                       [ "$file" = "$new" ] && break
+                       file="$new"
+               done;
+       done | sort -u)
+       tempfile=$(mktemp) || fatal "could not create tempfile" 51
+       echo '*' > "$tempfile"
+       for gitignore in $gitignores; do
+               echo "$gitignore" | sed 's/^/!/' >> "$tempfile"
+               [ -d "$gitignore" ] && echo "$gitignore/*" | sed 's/^/!/'>> "$tempfile"
        done
-       exit 0
-
-elif [ "$1" = 'run' ]; then
-       use $2
-       shift 2
-       "$@"
-       leave
-       exit 0
-
-elif [ "$1" = 'use' ]; then
-       if [[ -o NO_IGNORE_EOF ]]; then
-               export VCSH_NO_IGNORE_EOF=1
-               setopt IGNORE_EOF
-               if [[ -n $ZSH_VERSION ]]; then
-                       vcsh_exit() {
-                               vcsh exit;
-                               zle reset-prompt;
-                       }
-               fi
-               zle -N vcsh_exit
-               bindkey '^d' 'vcsh_exit'
+       diff -N "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" > /dev/null &&
+               rm -f "$tempfile" &&
+               exit
+       if [ -e "$HOME/.gitignore.d/$VCSH_REPO_NAME" ]; then
+               info "'$HOME/.gitignore.d/$VCSH_REPO_NAME' differs from new data, moving it to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'"
+               mv -f "$HOME/.gitignore.d/$VCSH_REPO_NAME" "$HOME/.gitignore.d/$VCSH_REPO_NAME.bak" ||
+                       fatal "could not move '$HOME/.gitignore.d/$VCSH_REPO_NAME' to '$HOME/.gitignore.d/$VCSH_REPO_NAME.bak'" 53
        fi
-       use $2
-       buildPS1
-       exit 0
-
-elif [ "$1" = 'clone' ]; then
-       GIT_REMOTE="$2"
-       REPO_NAME="$3"
-       [[ -z $REPO_NAME ]] && REPO_NAME=$(basename $GIT_REMOTE .git)
-       export REPO_NAME
-       export GIT_DIR="$VCSH_BASE/$REPO_NAME.git"
-       init
-
-       git remote add origin $GIT_REMOTE
-       git config branch.master.remote origin
-       git config branch.master.merge  refs/heads/master
-       git fetch
-       for i in $(git ls-tree -r origin/master | awk '{print $4}'); do
-       [[ -e $i ]] &&
-               echo "$SELF: error: $i exists." &&
-               CONFLICT=1;
-       done
-       [[ -n $CONFLICT ]] &&
-               echo "$SELF: fatal: will stop after fetching and not try to merge!\n" &&
-               exit 3
-       git merge origin/master
-       vcsh use $REPO_NAME
+       mv -f "$tempfile" "$HOME/.gitignore.d/$VCSH_REPO_NAME" ||
+               fatal "could not move '$tempfile' to '$HOME/.gitignore.d/$VCSH_REPO_NAME'" 53
+       cd "$old_dir"
+}
 
-elif [ "$1" = 'init' ]; then
-       export REPO_NAME="$2"
-       export GIT_DIR="$VCSH_BASE/$REPO_NAME.git"
-       init
-       vcsh use $REPO_NAME
+setup() {
+       use
+       git config core.worktree     "$GIT_WORK_TREE"
+       git config core.excludesfile ".gitignore.d/$VCSH_REPO_NAME"
+       git config vcsh.vcsh         'true'
+       touch   "$HOME/.gitignore.d/$VCSH_REPO_NAME"
+       git add "$HOME/.gitignore.d/$VCSH_REPO_NAME"
+}
 
-elif [ "$1" = 'exit' ]; then
-       if [[ $VCSH_NO_IGNORE_EOF -gt 0 ]]; then
-               unset VCSH_NO_IGNORE_EOF
-               setopt NO_IGNORE_EOF
+use() {
+       if [ ! -d "$GIT_DIR" ]; then
+               fatal "no repository found for '$VCSH_REPO_NAME'" 12
        fi
-       leave
-       buildPS1
-       exit 0
+       export GIT_WORK_TREE="$(git config --get core.worktree)"
+       export VCSH_DIRECTORY="$VCSH_REPO_NAME"
+}
 
+if [ "$1" = 'clone' ]; then
+       [ -z $2 ] && fatal "$1: please specify a remote" 1
+       export VCSH_COMMAND="$1"
+       GIT_REMOTE="$2"
+       [ -n "$3" ] && VCSH_REPO_NAME="$3" || VCSH_REPO_NAME=$(basename "$GIT_REMOTE" .git)
+       export VCSH_REPO_NAME
+       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
+elif [ "$1" = 'delete' ] ||
+     [ "$1" = 'enter' ] ||
+     [ "$1" = 'init' ] ||
+     [ "$1" = 'run' ] ||
+     [ "$1" = 'seed-gitignore' ] ||
+     [ "$1" = 'setup' ]; then
+       [ -z $2 ] && fatal "$1: please specify repository to work on" 1
+       [ "$1" = 'run' -a -z "$3" ] && fatal "$1: please specify a command" 1
+       export VCSH_COMMAND="$1"
+       export VCSH_REPO_NAME="$2"
+       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
+       [ "$1" = 'run' ] && shift 2 && export VCSH_EXTERNAL_COMMAND="$@"
+       [ "$1" = 'seed-gitignore' ] && export VCSH_COMMAND=seed_gitignore
+elif [ "$1" = 'list' ]; then
+       export VCSH_COMMAND="$1"
+elif [ -n "$1" ]; then
+       export VCSH_COMMAND=run
+       export VCSH_REPO_NAME="$1"
+       export GIT_DIR="$VCSH_BASE/$VCSH_REPO_NAME.git"
+       [ -d $GIT_DIR ] || { help; exit 1; }
+       shift 1
+       export VCSH_EXTERNAL_COMMAND="git $*"
 else
-       help
-       exit 3
-
+       # $1 is empty, or 'help'
+       help && exit
 fi
 
+for check_directory in "$VCSH_BASE" "$HOME/.gitignore.d"
+do
+       if [ ! -d "$check_directory" ]; then
+               if [ -e "$check_directory" ]; then
+                       fatal "'$check_directory' exists but is not a directory" 13
+               else
+                       info "attempting to create '$check_directory'"
+                       mkdir -p "$check_directory" || fatal "could not create '$check_directory'" 50
+               fi
+       fi
+done
+
+verbose "$VCSH_COMMAND begin"
+$VCSH_COMMAND
+verbose "$VCSH_COMMAND end, exiting"