From 5f79131543c9ca9c8833883f6146285ab0217df4 Mon Sep 17 00:00:00 2001
From: Andrew Lorimer <andrew@lorimer.id.au>
Date: Fri, 11 Jan 2019 10:53:59 +1100
Subject: [PATCH] add cht.sh

---
 cht.sh | 464 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 464 insertions(+)
 create mode 100755 cht.sh

diff --git a/cht.sh b/cht.sh
new file mode 100755
index 0000000..5c2a34f
--- /dev/null
+++ b/cht.sh
@@ -0,0 +1,464 @@
+#!/bin/sh
+#
+# [X] open section
+# [X] one shot mode
+# [X] usage info
+# [X] dependencies check
+# [X] help
+# [X] yank/y/copy/c
+# [X] Y/C
+# [X] eof problem
+# [X] more
+# [X] stealth mode
+#
+# here are several examples for the stealth mode:
+#
+# zip lists
+# list permutation
+# random list element
+# reverse a list
+# read json from file
+# append string to a file
+# run process in background
+# count words in text counter
+# group elements list
+
+__CHTSH_VERSION=4
+__CHTSH_DATETIME="2018-07-08 22:26:46 +0200"
+
+export LESSSECURE=1
+STEALTH_MAX_SELECTION_LENGTH=5
+
+case `uname -s` in
+  Darwin) is_macos=yes ;;
+  *) is_macos=no ;;
+esac
+
+# for KSH93
+if echo $KSH_VERSION | grep -q ' 93' && ! local foo 2>/dev/null; then
+  alias local=typeset
+fi
+
+get_query_options()
+{
+  local query="$*"
+  if [ -n "$CHTSH_QUERY_OPTIONS" ]; then
+    case $query in
+      *\?*)   query="$query&${CHTSH_QUERY_OPTIONS}";;
+      *)      query="$query?${CHTSH_QUERY_OPTIONS}";;
+    esac
+  fi
+  printf "%s" "$query"
+}
+
+do_query()
+{
+  local query="$*"
+  local b_opts=
+  local uri="${CHTSH_URL}/\"\$(get_query_options $query)\""
+
+  if [ -e "$HOME/.cht.sh/id" ]; then
+    b_opts="-b \"\$HOME/.cht.sh/id\""
+  fi
+
+  eval curl $b_opts -s $uri > "$TMP1"
+
+  if [ -z "$lines" ] || [ "$(wc -l "$TMP1" | awk '{print $1}')" -lt "$lines" ]; then
+    cat "$TMP1"
+  else
+    ${PAGER:-$defpager} "$TMP1"
+  fi
+}
+
+prepare_query()
+{
+  local section="$1"; shift
+  local input="$1"; shift
+  local arguments="$1"
+
+  local query
+  if [ -z "$section" ] || [ x"${input}" != x"${input#/}" ]; then
+    query=$(printf %s "$input" | sed 's@ @/@; s@ @+@g')
+  else
+    query=$(printf %s "$section/$input" | sed 's@ @+@g')
+  fi
+
+  [ -n "$arguments" ] && arguments="?$arguments"
+  printf %s "$query$arguments"
+}
+
+get_list_of_sections()
+{
+  curl -s "${CHTSH_URL}"/:list | grep -v '/.*/' | grep '/$' | xargs
+}
+
+gen_random_str()
+(
+  len=$1
+  if command -v openssl >/dev/null; then
+    openssl rand -base64 $(($len*3/4)) | awk -v ORS='' //
+  else
+    rdev=/dev/urandom
+    for d in /dev/{srandom,random,arandom}; do
+      test -r $d && rdev=$d
+    done
+    if command -v hexdump >/dev/null; then
+      hexdump -vn $(($len/2)) -e '1/1 "%02X" 1 ""' $rdev
+    elif command -v xxd >/dev/null; then
+      xxd -l $(($len/2)) -ps $dev | awk -v ORS='' //
+    else
+      cd /tmp
+      s=
+      while [ $(echo "$s" | wc -c) -lt $len ]; do
+        s="$s$(mktemp -u XXXXXXXXXX)"
+      done
+      printf %.${len}s "$s"
+    fi
+  fi
+)
+
+if [ -z "$CHTSH_CONF" ]; then
+  CHTSH_CONF="$HOME"/.cht.sh/cht.sh.conf
+fi
+
+if [ -e "$CHTSH_CONF" ]; then
+  # shellcheck disable=SC1090,SC2002
+  . "$CHTSH_CONF"
+fi
+
+[ -z "$CHTSH_URL" ] && CHTSH_URL=https://cht.sh
+
+# any better test not involving either OS matching or actual query?
+if [ `uname -s` = OpenBSD ] && [ -x /usr/bin/ftp ]; then
+  curl() {
+    local opt args="-o -"
+    while getopts "b:s" opt; do
+      case $opt in
+        b) args="$args -c $OPTARG";;
+        s) args="$args -M -V";;
+        *) echo "internal error: unsupported cURL option '$opt'" >&2; exit 1;;
+      esac
+    done
+    shift $(($OPTIND - 1))
+    /usr/bin/ftp $args "$@"
+  }
+else
+  command -v curl   >/dev/null || { echo 'DEPENDENCY: install "curl" to use cht.sh' >&2; exit 1; }
+  _CURL=$(command -v curl)
+  if [ x"$CHTSH_CURL_OPTIONS" != x ]; then
+    curl() {
+      $_CURL ${CHTSH_CURL_OPTIONS} "$@"
+    }
+  fi
+fi
+
+
+if [ "$1" = --read ]; then
+  read -r a || a=exit
+  printf "%s\n" "$a"
+  exit 0
+elif [ x"$1" = x--help ] || [ -z "$1" ]; then
+  cat <<EOF
+Usage:
+
+    ${0##*/} --help           show this help
+    ${0##*/} --shell [LANG]   shell mode (open LANG if specified)
+    ${0##*/} QUERY            process QUERY and exit
+EOF
+  exit 0
+elif [ x"$1" = x--shell ]; then
+  shell_mode=yes
+  shift
+fi
+
+prompt="cht.sh"
+opts=""
+input=""
+for o; do
+  if [ x"$o" != x"${o#-}" ]; then
+    opts="${opts}${o#-}"
+  else
+    input="$input $o"
+  fi
+done
+query=$(echo "$input" | sed 's@ *$@@; s@^ *@@; s@ @/@; s@ @+@g')
+
+if [ "$shell_mode" != yes ]; then
+  curl -s "${CHTSH_URL}"/"$(get_query_options "$query")"
+  exit 0
+else
+  new_section="$1"
+  valid_sections=$(get_list_of_sections)
+  valid=no; for q in $valid_sections; do [ "$q" = "$new_section/" ] && { valid=yes; break; }; done
+
+  if [ "$valid" = yes ]; then
+    section="$new_section"
+    this_query="$(echo "$input" | sed 's@ *[^ ]* *@@')"
+    this_prompt="\033[0;32mcht.sh/$section>\033[0m "
+  else
+    this_query="$input"
+    this_prompt="\033[0;32mcht.sh>\033[0m "
+  fi
+  if [ -n "$this_query" ] && [ -z "$CHEATSH_RESTART" ]; then
+    printf "$this_prompt$this_query\n"
+    curl -s "${CHTSH_URL}"/"$(get_query_options "$query")"
+  fi
+fi
+
+if [ "$is_macos" != yes ]; then
+  command -v xsel >/dev/null ||   echo 'DEPENDENCY: please install "xsel" for "copy"' >&2
+fi
+command -v rlwrap >/dev/null || { echo 'DEPENDENCY: install "rlwrap" to use cht.sh in the shell mode' >&2; exit 1; }
+
+mkdir -p "$HOME/.cht.sh/"
+lines=$(tput lines)
+
+if command -v less >/dev/null; then
+  defpager="less -R"
+elif command -v more >/dev/null; then 
+  defpager=more
+else
+  defpager=cat
+fi
+
+cmd_cd() {
+  if [ $# -eq 0 ]; then
+    section=""
+  else
+    new_section=$(echo "$input" | sed 's/cd  *//; s@/*$@@; s@^/*@@')
+    if [ -z "$new_section" ] || [ ".." = "$new_section" ]; then
+      section=""
+    else
+      valid_sections=$(get_list_of_sections)
+      valid=no; for q in $valid_sections; do [ "$q" = "$new_section/" ] && { valid=yes; break; }; done
+      if [ "$valid" = no ]; then
+        echo "Invalid section: $new_section"
+        echo "Valid sections:"
+        echo $valid_sections | xargs printf "%-10s\n" | tr ' ' .  | xargs -n 10 | sed 's/\./ /g; s/^/  /'
+      else
+        section="$new_section"
+      fi
+    fi
+  fi
+}
+
+cmd_copy() {
+  if [ -z "$DISPLAY" ]; then
+    echo copy: supported only in the Desktop version
+  elif [ -z "$input" ]; then
+    echo copy: Make at least one query first.
+  else
+    curl -s "${CHTSH_URL}"/"$(get_query_options "$query"?T)" > "$TMP1"
+    if [ "$is_macos" != yes ]; then
+      xsel -bi < "$TMP1"
+    else
+      cat "$TMP1" | pbcopy
+    fi
+    echo "copy: $(wc -l "$TMP1" | awk '{print $1}') lines copied to the selection"
+  fi
+}
+
+cmd_ccopy() {
+  if [ -z "$DISPLAY" ]; then
+    echo copy: supported only in the Desktop version
+  elif [ -z "$input" ]; then
+    echo copy: Make at least one query first.
+  else
+    curl -s "${CHTSH_URL}"/"$(get_query_options "$query"?TQ)" > "$TMP1"
+    if [ "$is_macos" != yes ]; then
+      xsel -bi < "$TMP1"
+    else
+      cat "$TMP1" | pbcopy
+    fi
+    echo "copy: $(wc -l "$TMP1" | awk '{print $1}') lines copied to the selection"
+  fi
+}
+
+cmd_exit() {
+  exit 0
+}
+
+cmd_help() {
+  cat <<EOF
+help    - show this help
+hush    - do not show the 'help' string at start anymore
+cd LANG - change the language context
+copy    - copy the last answer in the clipboard (aliases: yank, y, c)
+ccopy   - copy the last answer w/o comments (cut comments; aliases: cc, Y, C)
+exit    - exit the cheat shell (aliases: quit, ^D)
+id [ID] - set/show an unique session id ("reset" to reset, "remove" to remove)
+stealth - stealth mode (automatic queries for selected text)
+update  - self update (only if the scriptfile is writeable)
+version - show current cht.sh version
+/:help  - service help
+QUERY   - space ceparated query staring (examples are below)
+              cht.sh> python zip list
+              cht.sh/python> zip list
+              cht.sh/go> /python zip list
+EOF
+}
+
+cmd_hush() {
+  mkdir -p $HOME/.cht.sh/ && touch $HOME/.cht.sh/.hushlogin && echo "Initial 'use help' message was disabled"
+}
+
+cmd_id() {
+  id_file="$HOME/.cht.sh/id"
+
+  if [ id = "$input" ]; then
+    new_id=""
+  else
+    new_id=$(echo "$input" | sed 's/id  *//; s/ *$//; s/ /+/g')
+  fi
+  if [ "$new_id" = remove ]; then
+    if [ -e "$id_file" ]; then
+      rm -f -- "$id_file" && echo "id is removed"
+    else
+      echo "id was not set, so you can't remove it"
+    fi
+    return
+  fi
+  if [ -n "$new_id" ] && [ reset != "$new_id" ] && [ $(/bin/echo -n "$new_id" | wc -c) -lt 16 ]; then
+    echo "ERROR: $new_id: Too short id. Minimal id length is 16. Use 'id reset' for a random id"
+    return
+  fi
+  if [ -z "$new_id" ]; then
+    # if new_id is not specified check if we have some id already
+    # if yes, just show it
+    # if not, generate a new id
+    if [ -e "$id_file" ]; then
+      echo $(awk '$6 == "id" {print $NF}' <"$id_file" | tail -n 1)
+      return
+    else
+      new_id=reset
+    fi
+  fi
+  if [ "$new_id" = reset ]; then
+    new_id=$(gen_random_str 12)
+  else
+    echo WARNING: if someone gueses your id, he can read your cht.sh search history
+  fi
+  if [ -e "$id_file" ] && grep -q '\tid\t[^\t][^\t]*$' "$id_file" 2> /dev/null; then
+    sed -i 's/\tid\t[^\t][^\t]*$/ id '"$new_id"'/' "$id_file"
+  else
+    if ! [ -e "$id_file" ]; then
+      printf '#\n\n' > "$id_file"
+    fi
+    printf ".cht.sh\tTRUE\t/\tTRUE\t0\tid\t$new_id\n" >> "$id_file"
+  fi
+  echo "$new_id"
+}
+
+cmd_query() {
+  query=$(prepare_query "$section" "$input")
+  do_query "$query"
+}
+
+cmd_stealth() {
+  if [ "$input" != stealth ]; then
+    arguments=$(echo "$input" | sed 's/stealth //; s/ /\&/')
+  fi
+  trap break INT
+  if [ "$is_macos" = yes ]; then
+    past=$(pbpaste)
+  else
+    past=$(xsel -o)
+  fi
+  printf "\033[0;31mstealth:\033[0m you are in the stealth mode; select any text in any window for a query\n"
+  printf "\033[0;31mstealth:\033[0m selections longer than $STEALTH_MAX_SELECTION_LENGTH words are ignored\n"
+  if [ -n "$arguments" ]; then
+    printf "\033[0;31mstealth:\033[0m query arguments: ?$arguments\n"
+  fi
+  printf "\033[0;31mstealth:\033[0m use ^C to leave this mode\n"
+  while true; do
+    if [ "$is_macos" = yes ]; then
+      current=$(pbpaste)
+    else
+      current=$(xsel -o)
+    fi
+    if [ "$past" != "$current" ]; then
+      past=$current
+      current_text="$(echo $current | tr -c '[a-zA-Z0-9]' ' ')"
+      if [ $(echo $current_text | wc -w) -gt "$STEALTH_MAX_SELECTION_LENGTH" ]; then
+        echo "\033[0;31mstealth:\033[0m selection length is longer than $STEALTH_MAX_SELECTION_LENGTH words; ignoring"
+        continue
+      else
+        printf "\n\033[0;31mstealth: \033[7m $current_text\033[0m\n"
+        query=$(prepare_query "$section" "$current_text" "$arguments")
+        do_query "$query"
+      fi
+    fi
+    sleep 1;
+  done
+  trap - INT
+}
+
+cmd_update() {
+  [ -w "$0" ] || { echo "The script is readonly; please update manually: curl -s "${CHTSH_URL}"/:bash | sudo tee $0"; return; }
+  TMP2=$(mktemp /tmp/cht.sh.XXXXXXXXXXXXX)
+  curl -s "${CHTSH_URL}"/:cht.sh > "$TMP2"
+  if ! cmp "$0" "$TMP2" > /dev/null 2>&1; then
+    if grep -q ^__CHTSH_VERSION= "$TMP2"; then
+      # section was vaildated by us already
+      args="--shell $section"
+      cp "$TMP2" "$0" && echo "Updated. Restarting..." && rm "$TMP2" && CHEATSH_RESTART=1 exec "$0" $args
+    else
+      echo "Something went wrong. Please update manually"
+    fi
+  else
+    echo "cht.sh is up to date. No update needed"
+  fi
+  rm -f "$TMP2" > /dev/null 2>&1
+}
+
+cmd_version() {
+  insttime=$(ls -l -- "$0" | sed 's/  */ /g' | cut -d ' ' -f 6-8)
+  echo "cht.sh version $__CHTSH_VERSION of $__CHTSH_DATETIME; installed at: $insttime"
+  TMP2=$(mktemp /tmp/cht.sh.XXXXXXXXXXXXX)
+  if curl -s "${CHTSH_URL}"/:cht.sh > "$TMP2"; then
+    if ! cmp "$0" "$TMP2" > /dev/null 2>&1; then
+      echo "Update needed (type 'update' for that)".
+    else
+      echo "Up to date. No update needed"
+    fi
+  fi
+  rm -f "$TMP2" > /dev/null 2>&1
+}
+
+TMP1=$(mktemp /tmp/cht.sh.XXXXXXXXXXXXX)
+trap 'rm -f $TMP1 $TMP2' EXIT
+trap 'true' INT
+
+if ! [ -e "$HOME/.cht.sh/.hushlogin" ] && [ -z "$this_query" ]; then
+  echo "type 'help' for the cht.sh shell help"
+fi
+
+while true; do
+  if [ "$section" != "" ]; then
+    full_prompt="$prompt/$section> "
+  else
+    full_prompt="$prompt> "
+  fi
+
+  input=$(
+    rlwrap -H "$HOME/.cht.sh/history" -pgreen -C cht.sh -S "$full_prompt" sh "$0" --read | sed 's/ *#.*//'
+  )
+
+  cmd_name=${input%% *}
+  cmd_args=${input#* }
+  case $cmd_name in
+    "")             continue;;   # skip empty input lines
+    '?'|h|help)     cmd_name=help;;
+    hush)           cmd_name=hush;;
+    cd)             cmd_name=cd;;
+    exit|quit)      cmd_name=exit;;
+    copy|yank|c|y)  cmd_name=copy;;
+    ccopy|cc|C|Y)   cmd_name=ccopy;;
+    id)             cmd_name=id;;
+    stealth)        cmd_name=stealth;;
+    update)         cmd_name=update;;
+    version)        cmd_name=version;;
+    *)              cmd_name="query $cmd_name";;
+  esac
+  cmd_$cmd_name $cmd_args 
+done
-- 
2.43.2