# herdr-session.sh — pick or create a herdr session, then launch it. # # • Type to search existing sessions; Enter attaches to the selection. # • Type a name and press Ctrl-N to create + launch a new session. # • Esc cancels. # # Requires: herdr, fzf, jq

herder-session.sh

#!/usr/bin/env bash
#
# herdr-session.sh — pick or create a herdr session, then launch it.
#
#   • Type to search existing sessions; Enter attaches to the selection.
#   • Type a name and press Ctrl-N to create + launch a new session.
#   • Esc cancels.
#
# Requires: herdr, fzf, jq

set -uo pipefail

# --- locate herdr ---------------------------------------------------------
HERDR="${HERDR:-}"
if [[ -z "$HERDR" || ! -x "$HERDR" ]]; then
  HERDR="$(command -v herdr 2>/dev/null || true)"
fi
if [[ -z "$HERDR" || ! -x "$HERDR" ]]; then
  HERDR="$HOME/.local/bin/herdr"
fi
if [[ -z "$HERDR" || ! -x "$HERDR" ]]; then
  printf 'herdr not found on PATH. Install it or set HERDR=/path/to/herdr.\n' >&2
  exit 1
fi

# --- dependencies ---------------------------------------------------------
need() { command -v "$1" >/dev/null 2>&1 || { printf '%s is required.\n' "$1" >&2; exit 1; }; }
need fzf
need jq

# --- colors ---------------------------------------------------------------
ESC=$'\033'
C_TITLE="${ESC}[1;36m"
C_RUN="${ESC}[1;32m"
C_STOP="${ESC}[2m"
C_DIM="${ESC}[2m"
C_KEY="${ESC}[1m"
R="${ESC}[0m"

# --- gather sessions ------------------------------------------------------
# Each session becomes a tab-delimited line:  name<TAB>status<TAB>dir
# The name field stays plain so we can recover it from fzf's selection.
json="$("$HERDR" session list --json 2>/dev/null || true)"

rendered=""
count=0
while IFS=$'\t' read -r name status dir; do
  [[ -z "${name:-}" ]] && continue
  count=$((count + 1))
  if [[ "$status" == "running" ]]; then
    s="${C_RUN}● running${R}"
  else
    s="${C_STOP}○ stopped${R}"
  fi
  pname="$(printf '%-18s' "$name")"
  rendered+="$(printf '%s\t%s\t%s' "$pname" "$s" "${C_DIM}${dir}${R}")"$'\n'
done < <(jq -r '
    (.sessions // [])
    | sort_by((.running | not), .name)
    | .[]
    | [ .name,
        (if .running then "running" else "stopped" end),
        (.session_dir // "") ]
    | @tsv
  ' <<<"$json" 2>/dev/null)

# --- header ---------------------------------------------------------------
header="${C_TITLE}herdr sessions${R}  ${C_DIM}(${count} existing)${R}"$'\n'
header+="${C_KEY}Enter${R} attach   ${C_KEY}Ctrl-N${R} create from typed name   ${C_KEY}Esc${R} cancel"

# --- pick -----------------------------------------------------------------
# --print-query  : first output line is whatever the user typed
# --expect=ctrl-n: second line is "ctrl-n" if Ctrl-N was pressed, else empty
# selection line : the original chosen line (3rd output line), or empty
out="$(printf '%s' "$rendered" | fzf \
  --ansi \
  --delimiter=$'\t' \
  --with-nth=1,2,3 \
  --print-query \
  --expect=ctrl-n \
  --header="$header" \
  --prompt='session ❯ ' \
  --info=inline)" || true

[[ -z "$out" ]] && exit 0   # cancelled (Esc / Ctrl-C)

query="$(printf '%s\n' "$out" | sed -n '1p')"
key="$(printf '%s\n'   "$out" | sed -n '2p')"
sel="$(printf '%s\n'   "$out" | sed -n '3p')"

if [[ "$key" == "ctrl-n" ]]; then
  name="$query"                       # create new from typed name
else
  name="${sel%%$'\t'*}"               # first field of the chosen line
fi

# trim leading/trailing whitespace
name="${name#"${name%%[![:space:]]*}"}"
name="${name%"${name##*[![:space:]]}"}"

if [[ -z "$name" ]]; then
  printf 'No session name given.\n' >&2
  exit 1
fi

# --- launch ---------------------------------------------------------------
exec "$HERDR" --session "$name"

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