open Cmdliner

let tag_arg =
  let doc = "Search entries for a given tag." in
  Arg.(value & opt string "" & info [ "t"; "tag" ] ~docv:"TAG" ~doc)


let headlines_t = Term.(const Stitch.start $ tag_arg $ const ())

let envs =
  let docs = Cmdliner.Manpage.s_environment in
  [ Cmd.Env.info
      ~docs
      ~doc:
        "Directory where Stitch should search for notes. Needs to be set in order for \
         the program to work. Must be absolute path, I.E /home/bob/notes"
      "STITCH_DIRECTORY"
  ; Cmd.Env.info
      ~docs
      ~doc:
        "Grep command to use (defaults to \"grep\"). Stitch also works well with ugrep, \
         which greatly speeds up the program."
      "STITCH_GREP_CMD"
  ; Cmd.Env.info
      ~docs
      ~doc:"Pattern to use for headlines. (Default \"* \")"
      "STITCH_HEADLINE_PATTERN"
  ; Cmd.Env.info
      ~docs
      ~doc:
        "Pattern to use by grep to fetch headlines. Needs to be double escaped for \
         OCaml. (Default \"^\\\\* \")"
      "STITCH_HEADLINE_PATTERN_REGEXP"
  ; Cmd.Env.info
      ~docs
      ~doc:"Pattern used by grep to find tags. (Default \":[a-z-]+:\", matches :a-tag:"
      "STITCH_TAG_PATTERN"
  ; Cmd.Env.info
      ~docs
      ~doc:"Pattern for TODOS. Used for substitution. (Default \"* TODO\")"
      "STITCH_TODO"
  ; Cmd.Env.info
      ~docs
      ~doc:
        "Regexp used by grep to find TODO items. Needs to be double escaped for OCaml. \
         (Default \"^\\\\* TODO\")"
      "STITCH_TODO_REGEXP"
  ; Cmd.Env.info
      ~docs
      ~doc:"Pattern for DONE items. Used for substitution. (Default \"* DONE\")"
      "STITCH_DONE"
  ; Cmd.Env.info
      ~docs
      ~doc:
        "Regexp used by grep to find DONE items. Needs to be double escaped for OCaml. \
         (Default \"^\\\\* DONE\")"
      "STITCH_DONE_REGEXP"
  ]


let headlines_cmd =
  let doc = "note managing for unorganized minimalists" in
  let author = [ `S Manpage.s_authors; `P "Marc Coquand (mccd.space)" ] in
  let bugs =
    [ `S Manpage.s_bugs; `P "Email bug reports to ~marcc/stitch-general@lists.sr.ht." ]
  in
  let description =
    [ `S Manpage.s_description
    ; `P
        "Stitch is a minimal note and todo composing tool inspired by Howm for Emacs. It \
         works with any CLI editor and file format."
    ; `P
        "Stitch comes preconfigured to handle an org-esque file format, but can be \
         reconfigured to handle any file format you want (SEE ENVIRONMENT).  "
    ; `P
        "To set up, you will need to set STITCH_DIRECTORY (SEE ENVIRONMENT) at minimum. \
         Stitch does not come with any built-in note-capturing tool, but you can easily \
         set one up on your own (SEE EXAMPLES)."
    ; `P "Stitch currently only works with a system where you have one file per note."
    ; `P
        "When you enter the program for the first time, press '?' to see the list of \
         keybindings."
    ]
  in
  let example_set_up_basic =
    [ `S Manpage.s_examples
    ; `P "To get started, start by setting up a note directory in your shell profile"
    ; `Pre "export STITCH_DIRECTORY=/home/bob/notes"
    ; `P
        "Stitch does not specify anything on how to capture your notes, but you can \
         install the following shell script to your \\$PATH to have a basic note \
         capturing system."
    ; `Pre
        "  #!/bin/sh\n\
        \  JRNL=\"\\$STITCH_DIRECTORY/\\$(date +'%y-%m-%d.%H:%M.%S').org\"\n\
        \  echo '*  ' > /tmp/capture  \n\
        \  \\$EDITOR /tmp/capture +1\n\
        \  if grep -q '^\\\\*\\\\s*\\$' /tmp/capture \n\
        \  then \n\
        \     echo \"Empty capture; ignoring\"\n\
        \  else \n\
        \     echo \"Storing capture in \\$JRNL\"\n\
        \     cat /tmp/capture > \\$JRNL\n\
        \  fi"
    ; `P
        "Now you can run capture in your terminal and it will prompt you to write your \
         note and store it in your notes with a timestamp. You can also capture within \
         stitch, by running !capture"
    ; `P
        "With that, you can begin to capture your notes and they will be displayed in \
         reverse chronological order in stitch. You can add tags, for example :journal: \
         and :work:."
    ; `P
        "Once added, you can start viewing your notes in Stitch. So if you added a few \
         journal notes, you can view them with"
    ; `Pre "stitch -t :journal:"
    ; `P
        "If you press f, you will see toggle to see all notes stitched together. You can \
         see all commands with '?'"
    ; `P "You can also launch stitch without arguments to see all."
    ; `P
        "To set up TODO capturing, you can add a command shell script todo to your PATH \
         to capture TODO items"
    ; `Pre
        "  #!/bin/sh\n\
        \  TODO_BASE='* TODO  '\n\
        \  JRNL=\"\\$STITCH_DIRECTORY/\\$(date +'%y-%m-%d.%H:%M.%S').org\"\n\
        \  echo '* TODO  ' > /tmp/capture\n\
        \  \\$EDITOR /tmp/capture +1\"\n\
        \  if grep -q '^\\\\* TODO\\\\s*\\$' /tmp/capture \n\
        \  then \n\
        \     echo \"Empty capture\"\n\
        \  else \n\
        \     echo \"Storing capture in \\$JRNL\"\n\
        \     cat /tmp/capture > \\$JRNL\n\
        \  fi"
    ; `P
        "After that, you can capture a few TODO items by running todo in your terminal \
         or !todo in stitch, and you will be able to view them if you press 2. You can \
         see done items if you press 3. Press '?' to see how to toggle the todo items."
    ; `P
        "You can also delete notes by selecting the line of the note you want to delete \
         and then execute !rm %(file)"
    ]
  in
  let commands =
    [ `S "COMMAND SUBSTITUTION"
    ; `P ""
    ; `P
        "You can run arbitrary shell commands in Stitch. These commands can make use of \
         the variable substitutions below."
    ; `I ("%(file)", "Currently selected file")
    ; `I ("%(line)", "Currently selected content")
    ; `P
        "For example, if you select a line and run !rm %(file), it will remove that file."
    ]
  in
  let credit =
    [ `S "CREDIT"
    ; `P "Stitch was inspired by the note-taking tool Howm for EMacs by HIRAOKA Kazuyuki."
    ]
  in
  let info =
    Cmd.info
      ~envs
      "stitch"
      ~version:"0.0.3 ALPHA"
      ~doc
      ~man:
        (List.concat
           [ description; commands; example_set_up_basic; bugs; author; credit ])
  in
  Cmd.v info headlines_t


let () = exit (Cmd.eval headlines_cmd)