Extract shared launcher logic into development/_common.sh

start-nvim.sh and start-vim.sh now source a common helper for the
paths, log(), ensure_binary(), and the sample-wiki fixture, so the
fixture lives in exactly one place instead of being duplicated across
both launchers. Each launcher keeps only its editor-specific config
generation. start-nvim.sh also gains the NUWIKI_DEV_NO_SEED guard for
parity with start-vim.sh.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

development/start-nvim.sh

@@ -14,6 +14,7 @@
 #   ./development/start-nvim.sh                       # open the scratch wiki's index
 #   ./development/start-nvim.sh path/to/note.wiki     # open a specific file
 #   NUWIKI_DEV_WIKI=/tmp/foo ./development/start-nvim.sh
+#   NUWIKI_DEV_NO_SEED=1 ./development/start-nvim.sh      # use WIKI_DIR as-is (no scratch seeding)
 #   NUWIKI_DEV_SKIP_BUILD=1 ./development/start-nvim.sh   # reuse the cached binary
 #
 # The release binary is rebuilt on every launch so source changes
@@ -27,266 +28,14 @@
 
 set -euo pipefail
 
-REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
-DEV_DIR="${XDG_CACHE_HOME:-$HOME/.cache}/nuwiki-dev"
-WIKI_DIR="${NUWIKI_DEV_WIKI:-$DEV_DIR/wiki}"
+# Shared paths + helpers (log, ensure_binary, write_sample_wiki, seed_wiki).
+source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/_common.sh"
+
 INIT_FILE="$DEV_DIR/init.lua"
 STATE_DIR="$DEV_DIR/nvim-state"
 DATA_DIR="$DEV_DIR/nvim-data"
 CONFIG_DIR="$DEV_DIR/nvim-config"
 
-log() { printf '\033[1;34m[nuwiki-dev]\033[0m %s\n' "$*"; }
-
-ensure_binary() {
-  local bin="$REPO_ROOT/bin/nuwiki-ls"
-  local built="$REPO_ROOT/target/release/nuwiki-ls"
-  if [[ "${NUWIKI_DEV_SKIP_BUILD:-0}" == "1" ]]; then
-    if [[ ! -x "$bin" ]]; then
-      log "NUWIKI_DEV_SKIP_BUILD=1 but $bin is missing — building anyway"
-    else
-      log "NUWIKI_DEV_SKIP_BUILD=1 — using existing $bin"
-      return
-    fi
-  fi
-  log "building nuwiki-ls (release)…"
-  cargo build --release -p nuwiki-ls --manifest-path "$REPO_ROOT/Cargo.toml"
-  mkdir -p "$REPO_ROOT/bin"
-  ln -sf "$built" "$bin"
-  log "binary ready: $bin (built $(date -r "$built" '+%Y-%m-%d %H:%M:%S'))"
-}
-
-# write_sample_wiki DIR — lay down a fixture that exercises every vimwiki
-# feature nuwiki supports: one page per feature group plus a diary. Kept
-# identical to the copy in start-vim.sh so both launchers showcase the
-# same surface. Heredocs use a quoted delimiter so `$math`, backticks,
-# and backslashes land verbatim.
-write_sample_wiki() {
-  local root="$1"
-  mkdir -p "$root" "$root/diary"
-
-  cat > "$root/index.wiki" <<'EOF'
-= nuwiki sample wiki =
-
-%% Generated by the start-* dev launchers. A single fixture that exercises
-%% every vimwiki feature nuwiki supports — open the linked pages and run
-%% the plugin commands against them.
-
-One page per feature group:
-
-- [[Syntax]] — inline formatting, blocks, comments
-- [[Lists]] — bullets, ordering, checkbox states, nesting
-- [[Tables]] — alignment and spanning cells
-- [[Links]] — every wikilink and URL form
-- [[Notes]] — anchor targets for cross-page links
-- [[diary/diary]] — the diary index
-
-=== Heading level 3 ===
-==== Heading level 4 ====
-===== Heading level 5 =====
-====== Heading level 6 ======
-
-== Commands to try ==
-
-- :NuwikiTOC
-- :NuwikiGenerateLinks
-- :NuwikiCheckLinks
-- :NuwikiMakeDiaryNote
-
-:sample:smoke-test:sandbox:
-EOF
-
-  cat > "$root/Syntax.wiki" <<'EOF'
-= Syntax showcase =
-
-Back to [[index]].
-
-== Inline formatting ==
-
-*bold*, _italic_, *_bold italic_*, ~~strikethrough~~, `inline code`,
-super^script^ and sub,,script,,, and inline math $e^{i\pi} + 1 = 0$.
-
-== Keywords ==
-
-TODO STARTED FIXME XXX DONE FIXED STOPPED
-
-== Horizontal rule ==
-
-----
-
-== Blockquote ==
-
-> A quoted line.
-> A second quoted line.
-
-== Definition list ==
-
-Term:: Definition of the term.
-Another:: Its definition.
-
-== Code block ==
-
-{{{python
-def greet(name):
-    return f"hello {name}"
-}}}
-
-== Math block ==
-
-{{$
-\sum_{i=1}^{n} i = \frac{n(n+1)}{2}
-}}$
-
-== Comments ==
-
-%% a single-line comment
-%%+ a multi-line
-comment block +%%
-
-== Transclusion ==
-
-{{file:image.png}}
-{{image.png|alt text|width=120}}
-EOF
-
-  cat > "$root/Lists.wiki" <<'EOF'
-= Lists =
-
-Back to [[index]].
-
-== Unordered ==
-
-- item with dash
-- second
-  - nested under dash
-* item with star
-# item with hash
-
-== Ordered ==
-
-1. first
-2. second
-   1. nested ordered
-1) paren style
-a) alpha
-A) Alpha
-i) roman
-I) Roman
-
-== Checkbox states ==
-
-- [ ] empty (0%)
-- [.] started (1-33%)
-- [o] in progress (34-66%)
-- [O] nearly done (67-99%)
-- [X] done (100%)
-- [-] rejected
-
-== Nested with checkboxes ==
-
-- [ ] parent task
-  - [X] done subtask
-  - [ ] pending subtask
-    - [ ] deep subtask
-EOF
-
-  cat > "$root/Tables.wiki" <<'EOF'
-= Tables =
-
-Back to [[index]].
-
-== Plain ==
-
-| Name | Role |
-| Alice | Author |
-| Bob | Editor |
-
-== Aligned ==
-
-| Left | Center | Right |
-|:-----|:------:|------:|
-| a | b | c |
-| d | e | f |
-
-== Spanning cells ==
-
-| Header | Span |
-| cell | > |
-| rowspan | value |
-| \/ | value |
-EOF
-
-  cat > "$root/Links.wiki" <<'EOF'
-= Links =
-
-Back to [[index]].
-
-== Wikilinks ==
-
-- [[Notes]]
-- [[Notes|described]]
-- [[Notes#Section one]]
-- [[Notes#Section one|anchored + described]]
-- [[/index]]
-- [[diary/]]
-- [[#Wikilinks]]
-
-== Diary and interwiki ==
-
-- [[diary:2026-05-30]]
-- [[wiki1:index]]
-- [[wn.MyWiki:index]]
-
-== External and raw URLs ==
-
-- [[https://example.com]]
-- [[https://example.com|Example]]
-- https://example.com
-- mailto:gffranco@gmail.com
-- file:///etc/hosts
-EOF
-
-  cat > "$root/Notes.wiki" <<'EOF'
-= Notes =
-
-A page that other pages point at. Back to [[index]].
-
-== Section one ==
-
-Anchor target for cross-page links.
-
-== Section two ==
-
-Another anchor target.
-EOF
-
-  cat > "$root/diary/diary.wiki" <<'EOF'
-= Diary =
-
-Back to [[/index]].
-
-- [[2026-05-30]]
-EOF
-
-  cat > "$root/diary/2026-05-30.wiki" <<'EOF'
-= 2026-05-30 =
-
-A diary entry. Back to [[diary]].
-
-- [X] set up sample wiki
-- [ ] review every feature page
-EOF
-}
-
-seed_wiki() {
-  mkdir -p "$WIKI_DIR" "$WIKI_DIR/diary"
-  # Seed the whole showcase as a unit; skip when an index already exists
-  # so a re-run never clobbers edits made while testing.
-  if [[ -f "$WIKI_DIR/index.wiki" ]]; then
-    return
-  fi
-  write_sample_wiki "$WIKI_DIR"
-}
-
 write_init() {
   mkdir -p "$DEV_DIR"
   cat > "$INIT_FILE" <<EOF