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diff --git a/shell/zsh/tabcompletion/_doit b/shell/zsh/tabcompletion/_doit
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+#compdef doit
+
+_doit() {
+    local -a commands tasks
+    # format is 'completion:description'
+    commands=(
+        'auto: automatically execute tasks when a dependency changes'
+        'clean: clean action / remove targets'
+        'dumpdb: dump dependency DB'
+        'forget: clear successful run status from internal DB'
+        'help: show help'
+        'ignore: ignore task (skip) on subsequent runs'
+        'info: show info about a task'
+        'list: list tasks from dodo file'
+        'reset-dep: recompute and save the state of file dependencies without executing actions'
+        'run: run tasks'
+        'strace: use strace to list file_deps and targets'
+        'tabcompletion: generate script for tab-completion'
+    )
+
+    # split output by lines to create an array
+    tasks=("${(f)$(doit list --template '{name}: {doc}')}")
+
+    # complete command or task name
+    if (( CURRENT == 2 )); then
+        _arguments -A : '::cmd:(($commands))' '::task:(($tasks))'
+        return
+    fi
+
+    # revome program name from $words and decrement CURRENT
+    local curcontext context state state_desc line
+    _arguments -C '*:: :->'
+
+    # complete sub-command or task options
+    local -a _command_args
+    case "$words[1]" in
+        
+      (auto)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "(-v|--verbosity)"{-v,--verbosity}"[0 capture (do not print) stdout/stderr from task. 1 capture stdout only. 2 do not capture anything (print everything immediately). [default: 1\]]" \
+            
+            "--success[]" \
+            "--failure[]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (clean)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "(-c|--clean-dep)"{-c,--clean-dep}"[clean task dependencies too]" \
+            "(-a|--clean-all)"{-a,--clean-all}"[clean all task]" \
+            "(-n|--dry-run)"{-n,--dry-run}"[print actions without really executing them]" \
+            "--forget[also forget tasks after cleaning]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (dumpdb)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            ''
+        )
+      ;;
+
+
+      (forget)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "(-s|--follow-sub)"{-s,--follow-sub}"[forget task dependencies too]" \
+            "--disable-default[disable forgetting default tasks (when no arguments are passed)]" \
+            "(-a|--all)"{-a,--all}"[forget all tasks]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (help)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            '*::task:(($tasks))'
+            '::cmd:(($commands))'
+            ''
+        )
+      ;;
+
+
+      (ignore)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (info)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "--no-status[Hides reasons why this task would be executed.  [default: %(default)s\]]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (list)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "--all[list include all sub-tasks from dodo file]" \
+            "(-q|--quiet)"{-q,--quiet}"[print just task name (less verbose than default)]" \
+            "(-s|--status)"{-s,--status}"[print task status (R)un, (U)p-to-date, (I)gnored]" \
+            "(-p|--private)"{-p,--private}"[print private tasks (start with '_')]" \
+            "--deps[print list of dependencies (file dependencies only)]" \
+            "--template[display entries with template]" \
+            "--sort[choose the manner in which the task list is sorted. [default: %(default)s\]]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (reset-dep)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (run)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "(-a|--always-execute)"{-a,--always-execute}"[always execute tasks even if up-to-date [default: %(default)s\]]" \
+            "(-c|--continue)"{-c,--continue}"[continue executing tasks even after a failure [default: %(default)s\]]" \
+            "(-v|--verbosity)"{-v,--verbosity}"[0 capture (do not print) stdout/stderr from task. 1 capture stdout only. 2 do not capture anything (print everything immediately). [default: 1\]]" \
+            "(-r|--reporter)"{-r,--reporter}"[Choose output reporter. [default: %(default)s\]]" \
+            "(-o|--output-file)"{-o,--output-file}"[write output into file [default: stdout\]]" \
+            "(-n|--process)"{-n,--process}"[number of subprocesses [default: %(default)s\]]" \
+            "(-P|--parallel-type)"{-P,--parallel-type}"[Tasks can be executed in parallel in different ways: 'process': uses python multiprocessing module 'thread': uses threads [default: %(default)s\] ]" \
+            "--pdb[get into PDB (python debugger) post-mortem in case of unhandled exception]" \
+            "(-s|--single)"{-s,--single}"[Execute only specified tasks ignoring their task_dep [default: %(default)s\]]" \
+            "--auto-delayed-regex[Uses the default regex \".*\" for every delayed task loader for which no regex was explicitly defined]" \
+            "--failure-verbosity[Control re-display stdout/stderr for failed tasks on report summary. 0 do not show re-display 1 re-display stderr only 2 re-display both stderr/stdout [default: 0\] ]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (strace)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "(-a|--all)"{-a,--all}"[display all files (not only from within CWD path)]" \
+            "--keep[save strace command output into strace.txt]" \
+            '*::task:(($tasks))'
+            ''
+        )
+      ;;
+
+
+      (tabcompletion)
+          _command_args=(
+            "--db-file[file used to save successful runs [default: %(default)s\]]" \
+            "--backend[Select dependency file backend. [default: %(default)s\]]" \
+            
+            "--check_file_uptodate[Choose how to check if files have been modified. Available options [default: %(default)s\]:   'md5': use the md5sum   'timestamp': use the timestamp ]" \
+            "(-f|--file)"{-f,--file}"[load task from dodo FILE [default: %(default)s\]]" \
+            "(-d|--dir)"{-d,--dir}"[set path to be used as cwd directory (file paths on dodo file are relative to dodo.py location).]" \
+            "(-k|--seek-file)"{-k,--seek-file}"[seek dodo file on parent folders [default: %(default)s\]]" \
+            "(-s|--shell)"{-s,--shell}"[Completion code for SHELL. [default: %(default)s\]]" \
+            "--hardcode-tasks[Hardcode tasks from current task list.]" \
+            ''
+        )
+      ;;
+
+
+        # default completes task names
+        (*)
+           _command_args='*::task:(($tasks))'
+        ;;
+    esac
+
+    # -A no options will be completed after the first non-option argument
+    _arguments -A : $_command_args
+    return 0
+}
+
+_doit