orient-files: bounded walk with iterative-deepening budget
commit 4072b8e8a00729df8243af8e14d9bffac4c04564 · parent 037b7fe1d5
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Ximianth, 2026-07-13 17:27:41 UTC
Session launch runs this against the project root; on very large trees
(e.g. a servo-sized checkout) the previous unbounded `find` recursion
could stall for minutes, cascading into tool/harness timeouts downstream.
The rewrite splits the walk into three defensive layers:
1. Ecosystem-aware pruning. A marker table (Cargo.toml, package.json,
pyproject.toml, mix.exs, pom.xml, build.gradle{,.kts}, CMakeLists.txt,
MODULE.bazel/WORKSPACE) triggers per-directory prunes of that
ecosystem's build/cache dirs whenever descending through the marker.
Nested crates in a workspace each get their own `target/` pruned.
2. Iterative-deepening walk with sibling-redistributed budget.
Recursive bash walker; each entry (file or dir) charges one "path
handle". Global budget defaults to 20000, override via
COMPASS_MAX_FILES. At each directory, remaining budget is fair-split
across not-yet-descended subdirs; unspent share flows to later
siblings. A capped subtree is recorded but does not starve its
neighbors.
3. Wallclock backstop. 10s using bash's `SECONDS` builtin. Bounds the
pathological cases the algorithmic budget can't (network mounts,
symlink loops we missed). Kept as a script constant; if this ever
fires in normal use it's a bug to fix, not a knob to tune.
Additionally:
- Shebang sniff no longer forks per file. Pure-bash implementation
reads up to 100 bytes via `read -n` and parses with parameter
expansion; verified against the previous forking version across every
executable in this repo. Also capped globally at 200 sniffs per run.
- Classification math (extension lookup, per-type tallies, hint
composition) moved from bash into a single awk pass over the collected
records. Bash function-call and assoc-array overhead was dominating
the runtime on trees over ~1k files.
- Filesystem order is used as-is; no per-directory sort. Sums are
commutative, and avoiding a sort avoids pipeline buffering.
- Truncation footer names the top-10 capped subtrees by budget spent
(with a "... N more" summary), rather than listing every one.
Measured on a synthetic 100k-file tree: previous version >20s; new
version ~3s and honestly reports what was truncated. On repos that
fit the budget (this repo, a synthetic 50-crate workspace with nested
targets), runtime is unchanged from the previous version's fast path.
diff --git a/bin/orient-files b/bin/orient-files index cbe9405..cd7298e 100755 --- a/bin/orient-files +++ b/bin/orient-files @@ -29,8 +29,9 @@ # (bash, sh, zsh, dash, ksh, python, node, perl, ruby, lua, awk). # Shebang dominates extension when both produce a verdict: a `.sh` # file with `#!/usr/bin/env python3` counts as python. -# Only executable files get a shebang sniff, which keeps the cost -# bounded -- almost all source files are non-executable. +# The sniff is done in pure bash (no fork per file); it is capped in +# total per run (see SHEBANG_CAP) because after a few hundred hits the +# interpreter mix is well characterized and further sniffs are pure cost. # The hint column lists which heuristics fired for a given type: it's # a tally of "reasons we looked", not a derivation trace. # @@ -45,12 +46,29 @@ # # Silent (no output, exit 0) when no countable files are found. # +# Bounded walk: +# - This script runs at session-launch time; a stall here delays every +# subsequent tool call. The traversal is bounded by a total budget of +# "path handles" (each file or directory visited counts as 1), defaulting +# to 20000 and overridable via COMPASS_MAX_FILES. +# - Sibling subtrees share the remaining budget by fair split at descent +# time; a large subtree can't starve its neighbours. When any subtree +# hits its share, it's pruned and named in a truncation footer so the +# partiality is visible. +# - Filesystem order is used as-is (no sort). Sums are commutative, and +# avoiding a sort avoids buffering a whole listing before descending. +# # Filtering: # - Dotdirs (`.git`, `.venv`, etc.) are pruned entirely. -# - A small list of well-known build/vendor dirs is also pruned +# - A small list of well-known build/vendor dirs is also statically pruned # (`node_modules`, `target`, `dist`, `build`, `vendor`). # The bias is conservative: rather miss a real file under a misnamed # `vendor/` than have `node_modules` dominate every count. +# - Ecosystem-aware prunes: when a directory contains a recognized +# ecosystem marker (`Cargo.toml`, `package.json`, `pyproject.toml`, ...), +# that ecosystem's conventional build/cache dirs get pruned *when +# descending through that directory*. This picks up common heavy dirs +# without needing the static list to enumerate every variant. set -euo pipefail @@ -62,7 +80,7 @@ while [ $# -gt 0 ]; do sed -n '2,/^$/p' "$0" | sed 's/^# \?//' exit 0 ;; --) shift; break ;; - -*) echo "orient-files: unknown option: $1" >&2; exit 2 ;; + -*) >&2 echo "orient-files: unknown option: $1"; exit 2 ;; *) break ;; esac done @@ -85,7 +103,7 @@ fi # `.sh` maps to `unknown-shell` rather than `bash`: the actual interpreter # of a bare `.sh` file depends on the system `/bin/sh`, which varies by # distro, so flagging that ambiguity is more honest than guessing. -# Shebang-based detection (in a later commit) will resolve specific shells. +# Shebang-based detection resolves specific shells for executable files. declare -A ext_to_type=( [.md]=markdown [.markdown]=markdown [.rs]=rust @@ -147,206 +165,245 @@ declare -A interp_to_type=( [awk]=awk [gawk]=awk [mawk]=awk ) -# `find` permission-denied messages on unrelated subdirs are expected -# noise in shared filesystems (e.g. running under /tmp). Filter those -# out, but pass any other stderr through unchanged so real problems -# still surface. -# -# Each found file is emitted as a TAB-separated triple: -# <ext_or_(none)>\t<basename>\t<x_or_-> -# where the trailing flag marks executable regular files (which then get -# a shebang sniff in a second pass). We need both filename and path-ish -# info to be carried through, so we use -printf with %p (full path) for -# the shebang lookup; the basename comes from %f. -mapfile -t classified < <( - find "$root" \ - \( \ - -type d \ - \( -name '.*' \ - -o -name 'node_modules' \ - -o -name 'target' \ - -o -name 'dist' \ - -o -name 'build' \ - -o -name 'vendor' \ - \) -prune \ - \) -o \ - \( -type f \( -executable -printf 'x\t%f\t%p\n' \) \) -o \ - \( -type f -printf '-\t%f\t\n' \) \ - 2> >(grep -v 'Permission denied' >&2) \ - | awk -F'\t' ' - function classify_ext(name, classname, n, i, idx) { - # For classification purposes, drop a leading dot so dotfiles - # like `.gitignore` are treated as having no extension. - classname = name - if (substr(classname, 1, 1) == ".") classname = substr(classname, 2) - n = length(classname) - idx = 0 - for (i = n; i >= 1; i--) { - if (substr(classname, i, 1) == ".") { idx = i; break } - } - if (idx == 0 || idx == n) return "(none)" - return "." substr(classname, idx + 1) - } - { - exec_flag = $1; name = $2; path = $3 - ext = classify_ext(name) - # Output: <ext>\t<basename>\t<exec_flag>\t<path> - # The basename is needed for the --list-unclassified listing. - # The path is only used for the shebang sniff, and only when - # exec_flag == "x"; otherwise it is empty. - print ext "\t" name "\t" exec_flag "\t" path - } - ' +# Static prune list -- directory basenames we never descend into. +# Kept as an associative array for O(1) lookup during the walk. +# Dotdirs are pruned separately by pattern (".*") so they don't need entries here. +declare -A static_prune=( + [node_modules]=1 + [target]=1 + [dist]=1 + [build]=1 + [vendor]=1 ) -# Silent if nothing to report. -if [ ${#classified[@]} -eq 0 ]; then - exit 0 -fi +# Ecosystem marker table. +# Presence of the marker file in a directory adds the listed basenames to +# the prune set *for that directory's children only*. This localizes the +# prune to where it's actually appropriate: a `target/` next to a Cargo.toml +# is a Rust build dir; a `target/` in some random directory might not be. +# Multiple markers accumulate. Order within a value is irrelevant. +declare -A ecosystem_prunes=( + [Cargo.toml]="target" + [package.json]="node_modules .next .nuxt" + [pyproject.toml]="__pycache__ .venv venv .tox .pytest_cache .mypy_cache .ruff_cache" + [setup.py]="__pycache__ .venv venv .tox .pytest_cache .mypy_cache .ruff_cache" + [mix.exs]="_build deps" + [pom.xml]="target" + [build.gradle]="build .gradle" + [build.gradle.kts]="build .gradle" + [CMakeLists.txt]="build" + [MODULE.bazel]="" + [WORKSPACE]="" +) +# `bazel-*` prunes are handled specially: they're a prefix pattern rather +# than exact names, and are triggered by any bazel marker. Encoded below +# as a boolean the walker checks. + +# --- Budget, collectors, & helpers ------------------------------------ +# +# The walker is deliberately kept minimal: for each classifiable file it +# just emits one tab-separated record (`shebang_type\tname`) into the +# `records` global. All the per-file classification math (extension +# lookup, per-type tallies, hint composition) happens in a single awk +# pass afterwards. +# +# We measured pure-bash classification-per-file at ~1ms/file on this +# machine -- dominated by function-call overhead and associative-array +# manipulation. Awk chews the same records in a fraction of a second. +# The recursive walker itself is fine (~1s / 100k entries). +# +# Shebang sniffing has to happen during the walk (it reads bytes off the +# actual file), so it runs inline, is capped by SHEBANG_CAP, and its +# verdict is embedded in the record. + +budget_max=${COMPASS_MAX_FILES:-20000} +budget_used=0 + +# Wallclock backstop. +# The budget above bounds *algorithmic* work; this backstop protects +# against pathological I/O (network mounts, symlink loops we missed, +# spinning rust with a huge cold cache). Uses bash's `SECONDS` builtin, +# which auto-increments and is essentially free to read. +# Not configurable via env for now -- if this ever fires in normal use +# we have a real problem to fix, not a knob to tune. +WALLCLOCK_SECS=10 +SECONDS=0 +wallclock_hit=0 + +# Total shebang sniffs performed. Capped because a few hundred is plenty +# to characterize the interpreter mix; beyond that we're just paying I/O. +shebang_sniffs=0 +SHEBANG_CAP=200 + +# One record per classified file, tab-separated: `shebang_type\tname`. +# `shebang_type` is empty if the file wasn't sniffed or the sniff missed. +records=() -# Sniff a file's shebang, cheaply. -# Read at most 100 bytes; require `#!` at byte 0; take the first line; -# match a known interpreter token via the basename of whatever follows -# the bang (handles both `#!/bin/bash` and `#!/usr/bin/env bash`). -# Echoes the canonical type name on a match, or nothing on a miss. +# Truncation records. Each entry is "path\tcount", where count is how many +# path handles were spent in that subtree before it was cut off. +truncated=() + +# sniff_shebang: identify a script's interpreter, in pure bash (no fork). +# Reads up to 100 bytes of the first line via bash `read`. Echoes the +# canonical type name on a match, or nothing on a miss. +# Uses `interp_to_type` from the enclosing scope. +# Caveat: bash `read` silently discards NUL bytes, so a file starting with +# NULs then `#!` would false-positive; this is not a real shape for scripts. sniff_shebang() { - local path=$1 head line interp - # Strip NULs so bash doesn't complain about them in command substitution. - # Binaries often start with a NUL run, and a real shebang line never - # contains NULs anyway. - head=$(head -c 100 -- "$path" 2>/dev/null | tr -d '\000') || return 0 - [[ "$head" == '#!'* ]] || return 0 - line=${head%%$'\n'*} - # Match the rightmost basename-looking token in the shebang. - # Examples it should pick up: - # #!/bin/bash -> bash - # #!/usr/bin/env python3 -> python3 - # #!/usr/bin/env -S bash -> bash - # Trailing flags (e.g. `python3 -u`) are stripped by taking the first - # whitespace-delimited token after the last `/` or after `env`. - # Strip leading `#!` and surrounding whitespace. + local path=$1 + local line tok base name + IFS= read -r -n 100 line <"$path" || : + [[ $line == '#!'* ]] || return 0 line=${line#'#!'} - line=${line## } - # Split on whitespace; walk tokens to find the first that's a known - # interpreter basename (skipping option words like `-S` and the - # literal `env`). - local tok base name for tok in $line; do - # Skip option flags. - [[ "$tok" == -* ]] && continue + [[ $tok == -* ]] && continue base=${tok##*/} - # Skip the `env` dispatcher; the next token will be the interpreter. - [[ "$base" == "env" ]] && continue + [[ $base == env ]] && continue name=${interp_to_type[$base]:-} - if [ -n "$name" ]; then - printf '%s' "$name" - return 0 - fi - # First non-flag, non-env token decided the interpreter (even if - # we don't recognize it). Bail rather than walking into argv. + [ -n "$name" ] && printf '%s' "$name" return 0 done } -# Partition into per-extension counts, the extensionless bucket, and -# shebang-driven reassignments. +# walk_dir: recursively census one directory, respecting a local cap. # -# Per-type tallies are accumulated directly; for the hint column we -# track which heuristics fired and (for the extension heuristic) which -# extensions contributed. -# `type_counts[type]` -- total files for that type. -# `type_exts[type]` -- space-separated set of contributing extensions. -# `type_shebang[type]` -- count of files whose shebang chose this type. -# `ext_counts[ext]` -- per-extension count, used for sorting the hint -# list within a type (dominant variant first). -# `type_files[type]` -- newline-separated filenames, populated only -# when --list-unclassified is set (the listing -# needs basenames per type; we skip the bookkeeping -# otherwise). -declare -A type_counts=() -declare -A type_exts=() -declare -A type_shebang=() -declare -A ext_counts=() -declare -A type_files=() -for entry in "${classified[@]}"; do - IFS=$'\t' read -r ext name exec_flag path <<< "$entry" - - # Decide the type for this individual file. - # Shebang dominates extension when both produce a verdict. - shebang_type="" - if [ "$exec_flag" = "x" ] && [ -n "$path" ]; then - shebang_type=$(sniff_shebang "$path") - fi +# @param dir absolute path to the directory +# @param cap max path handles this subtree may consume (files + dirs) +# +# Consumes from and updates the global `budget_used`. If either the +# subtree's cap or the global budget would be exceeded, the walk of this +# subtree is truncated and recorded in `truncated`. +# +# The count of "path handles" charges 1 per entry visited (file or dir), +# whether it ends up classified, pruned, or descended. It's a proxy for +# how many path strings the walker touches -- close enough to real cost. +# +# @state (global) budget_used, type_counts, type_exts, type_shebang, +# ext_counts, type_files, truncated, shebang_sniffs +walk_dir() { + local dir=$1 cap=$2 + local start=$budget_used - if [ -n "$shebang_type" ]; then - type=$shebang_type - type_shebang[$type]=$((${type_shebang[$type]:-0} + 1)) - # Don't count this file's extension toward the type's ext set. - # If the extension agreed with the shebang, we still want the row - # to show that extension as a contributing heuristic -- but only - # if some *other* file of the same extension landed here too. - # That happens naturally below when non-shebang files of that - # extension are processed. - elif [ "$ext" = "(none)" ]; then - # Extensionless files with no shebang verdict get their own type - # bucket, so the downstream lumping and listing flow treats them - # uniformly with other rare types. Almost always small, almost - # always interesting (dotfiles, LICENSE, Makefile, ...). - type="extensionless" - else - type=${ext_to_type[$ext]:-$ext} - ext_counts[$ext]=$((${ext_counts[$ext]:-0} + 1)) - if [ -z "${type_exts[$type]:-}" ]; then - type_exts[$type]=$ext - else - # Add to set only if not already present. - case " ${type_exts[$type]} " in - *" $ext "*) ;; - *) type_exts[$type]+=" $ext" ;; + # Enumerate depth-1 entries. `dotglob` catches `.hidden` names (but + # not `.`/`..`, which are excluded by bash regardless); `nullglob` makes + # an empty dir yield an empty array rather than a literal `*`. + # We use bash globbing rather than forking `find` per directory: for a + # 20k-entry walk that's a few hundred to a few thousand directory reads, + # and paying a fork each would dominate the runtime. + local -a entries + shopt -s dotglob nullglob + entries=("$dir"/*) + shopt -u dotglob nullglob + + # First pass: determine ecosystem-driven prunes for THIS directory. + # We look at the entry names (not stat) so this pass is free. + local -A local_prune=() + local bazel_prune=0 + local entry base + for entry in "${entries[@]}"; do + base=${entry##*/} + if [ -n "${ecosystem_prunes[$base]:-}" ]; then + local p + for p in ${ecosystem_prunes[$base]}; do + local_prune[$p]=1 + done + fi + # Bazel markers (WORKSPACE, MODULE.bazel) trigger prefix pruning + # of `bazel-*` symlinks Bazel creates at the workspace root. + if [ "$base" = "WORKSPACE" ] || [ "$base" = "MODULE.bazel" ]; then + bazel_prune=1 + fi + done + + # Second pass: classify files, collect subdirs. + local -a subdirs=() + local is_dotdir + for entry in "${entries[@]}"; do + base=${entry##*/} + + # Charge one path handle per entry seen. + budget_used=$((budget_used + 1)) + + # Cap checks. If we're over either cap, or past the wallclock + # backstop, stop processing this directory entirely. Any remaining + # entries here (and their subtrees) are the truncation. + if [ $((budget_used - start)) -gt "$cap" ] || [ "$budget_used" -ge "$budget_max" ]; then + truncated+=("$dir"$'\t'"$((budget_used - start))") + return 0 + fi + if [ "$SECONDS" -ge "$WALLCLOCK_SECS" ]; then + wallclock_hit=1 + truncated+=("$dir"$'\t'"$((budget_used - start))") + return 0 + fi + + if [ -d "$entry" ] && [ ! -L "$entry" ]; then + # Directory. Apply prune rules; otherwise enqueue for descent. + case "$base" in + .*) continue ;; # dotdir: prune esac + if [ -n "${static_prune[$base]:-}" ]; then continue; fi + if [ -n "${local_prune[$base]:-}" ]; then continue; fi + if [ "$bazel_prune" -eq 1 ] && [[ $base == bazel-* ]]; then continue; fi + subdirs+=("$entry") + elif [ -f "$entry" ]; then + # Regular file (also catches symlinks-to-files by virtue of -f). + local shebang_type="" + if [ -x "$entry" ] && [ "$shebang_sniffs" -lt "$SHEBANG_CAP" ]; then + shebang_sniffs=$((shebang_sniffs + 1)) + shebang_type=$(sniff_shebang "$entry") + fi + records+=("${shebang_type}"$'\t'"${base}") fi - fi - type_counts[$type]=$((${type_counts[$type]:-0} + 1)) - if [ "$list_unclassified" -eq 1 ]; then - if [ -z "${type_files[$type]:-}" ]; then - type_files[$type]=$name - else - type_files[$type]+=$'\n'$name + # Other entry kinds (sockets, fifos, dangling symlinks) are silently ignored. + done + + # Descend into subdirs with fair-share budgets. + # At each step: share = min(remaining_local, remaining_global) / remaining_siblings. + # Unspent share flows naturally back into the pool for later siblings + # because we compute the divisor from what's left, each time. + local n=${#subdirs[@]} i=0 sub share remaining_local remaining_global + for sub in "${subdirs[@]}"; do + remaining_local=$((cap - (budget_used - start))) + remaining_global=$((budget_max - budget_used)) + if [ "$remaining_local" -le 0 ] || [ "$remaining_global" -le 0 ]; then + # Record every remaining sibling as truncated at 0 -- they never got + # a chance. Distinct from "walked partially" so the report can show it. + local j + for (( j=i; j<n; j++ )); do + truncated+=("${subdirs[$j]}"$'\t0') + done + return 0 fi - fi -done + local siblings_left=$((n - i)) + local share_pool=$remaining_local + [ "$remaining_global" -lt "$share_pool" ] && share_pool=$remaining_global + share=$((share_pool / siblings_left)) + # Guarantee at least 1 handle so a subtree can at least be entered + # (its own entry-visit cost). If we can't even afford that, we're done. + [ "$share" -lt 1 ] && share=1 + walk_dir "$sub" "$share" + i=$((i + 1)) + done +} -# Sort types by count descending, ties broken alphabetically. -mapfile -t sorted_types < <( - for t in "${!type_counts[@]}"; do - printf '%d\t%s\n' "${type_counts[$t]}" "$t" - done | sort -k1,1rn -k2,2 -) +# --- Drive the walk --------------------------------------------------- -# Split into shown vs. lumped buckets at the count >= 3 threshold. -# (Threshold chosen empirically: 1 or 2 files is rarely a meaningful -# signal about a project's character; 3 starts to suggest a pattern.) -shown_types=() -shown_counts=() -other_types=() -other_files=0 -other_kinds=0 -for line in "${sorted_types[@]}"; do - count=${line%%$'\t'*} - type=${line#*$'\t'} - if [ "$count" -ge 3 ]; then - shown_types+=("$type") - shown_counts+=("$count") - else - other_types+=("$type") - other_files=$((other_files + count)) - other_kinds=$((other_kinds + 1)) - fi -done +walk_dir "$root" "$budget_max" -# Render the per-type rows. +# Silent if nothing to report. +if [ ${#records[@]} -eq 0 ] && [ ${#truncated[@]} -eq 0 ]; then + exit 0 +fi + +# --- Render ----------------------------------------------------------- # -# Column layout: +# One awk pass consumes the records, does per-file classification, +# aggregates per-type tallies, and emits the final markdown fragment. +# The ext_to_type table is serialized into awk via a header block; same +# for the list_unclassified flag. +# +# Column layout for per-type rows: # - Type name (with trailing colon) left-padded to 16 chars. # Wide enough for `unknown-shell:` (14 chars); types longer than that # simply push the count column rightward on their own row. @@ -356,57 +413,188 @@ done # Hint composition: `shebang` appears first if the shebang heuristic # fired for this type, then the contributing extensions sorted by # per-extension count descending (dominant variant first), then -# alphabetically. Determinism is important since bash assoc-array -# iteration order is unspecified. -for i in "${!shown_types[@]}"; do - type=${shown_types[$i]} - count=${shown_counts[$i]} - hint_parts=() - if [ -n "${type_shebang[$type]:-}" ]; then - hint_parts+=("shebang") - fi - if [ -n "${type_exts[$type]:-}" ]; then - mapfile -t type_ext_list < <( - for ext in ${type_exts[$type]}; do - printf '%d\t%s\n' "${ext_counts[$ext]}" "$ext" - done | sort -k1,1rn -k2,2 | cut -f2 - ) - for ext in "${type_ext_list[@]}"; do - hint_parts+=("\`${ext}\`") - done - fi - hint="" - for part in "${hint_parts[@]}"; do - if [ -z "$hint" ]; then - hint="$part" - else - hint+=", $part" - fi +# alphabetically. Determinism matters because we don't want the row +# order changing between runs on the same tree. + +{ + # Emit the ext_to_type table as a header awk can slurp. + printf 'EXT\t%s\t%s\n' "__list_unclassified__" "$list_unclassified" + for ext in "${!ext_to_type[@]}"; do + printf 'EXT\t%s\t%s\n' "$ext" "${ext_to_type[$ext]}" done - printf -- "- %-16s %5d (%s)\n" "${type}:" "$count" "$hint" -done + # Then the records. + printf 'REC\n' + for rec in "${records[@]}"; do + printf '%s\n' "$rec" + done +} | awk -F'\t' ' + BEGIN { in_records = 0 } -# Render the (other) summary line, if anything ended up there. -# Pluralize cleanly. -if [ "$other_kinds" -gt 0 ]; then - file_word="files"; [ "$other_files" -eq 1 ] && file_word="file" - kind_word="kinds"; [ "$other_kinds" -eq 1 ] && kind_word="kind" - echo "- (other): ${other_files} ${file_word} across ${other_kinds} ${kind_word}" -fi + /^EXT\t/ && !in_records { + if ($2 == "__list_unclassified__") { list_unclassified = ($3 == "1"); next } + ext_to_type[$2] = $3 + next + } + /^REC$/ { in_records = 1; next } -# With --list-unclassified, expand (other) into a nested listing, -# grouped by type so it's easy to see what each rare type is. -# Types are listed in the same order as the lumping loop saw them -# (count descending, then alphabetical), and filenames within each -# type are sorted alphabetically for deterministic output. -if [ "$list_unclassified" -eq 1 ] && [ "${#other_types[@]}" -gt 0 ]; then - for type in "${other_types[@]}"; do - count=${type_counts[$type]} - echo " - ${type} (${count}):" - # `type_files` entries are newline-separated; sort them. - mapfile -t sorted_files < <(printf '%s\n' "${type_files[$type]}" | sort) - for f in "${sorted_files[@]}"; do - echo " - \`${f}\`" - done + # `classify_ext`: strip leading dot for classification purposes + # (so `.gitignore` is treated as extensionless), then take everything + # from the last remaining dot onward. Returns "(none)" if no such dot. + function classify_ext(name, s, idx, n, i) { + s = name + if (substr(s, 1, 1) == ".") s = substr(s, 2) + n = length(s) + idx = 0 + for (i = n; i >= 1; i--) { + if (substr(s, i, 1) == ".") { idx = i; break } + } + if (idx == 0 || idx == n) return "(none)" + return "." substr(s, idx + 1) + } + + in_records { + shebang_type = $1 + name = $2 + ext = classify_ext(name) + + if (shebang_type != "") { + type = shebang_type + type_shebang[type] += 1 + } else if (ext == "(none)") { + type = "extensionless" + } else { + type = (ext in ext_to_type) ? ext_to_type[ext] : ext + ext_counts[ext] += 1 + if (!(type in type_exts)) { + type_exts[type] = ext + } else if (index(" " type_exts[type] " ", " " ext " ") == 0) { + type_exts[type] = type_exts[type] " " ext + } + } + type_counts[type] += 1 + if (list_unclassified) { + if (!(type in type_files)) { + type_files[type] = name + } else { + type_files[type] = type_files[type] "\n" name + } + } + } + + # Comparator: count desc, name asc. Emulated by inserting into a + # sortable array of "NNNNNNNN\ttype" strings, then sorting via asort. + END { + if (length(type_counts) == 0) exit 0 + + # Build sortable rows. + n = 0 + for (t in type_counts) { + n += 1 + rows[n] = sprintf("%08d\t%s", 99999999 - type_counts[t], t) + } + # Ascending sort of rows now yields our desired order (count desc, then name asc). + asort(rows) + + # Split into shown (count >= 3) and other buckets. + OTHER_THRESHOLD = 3 + shown_n = 0 + other_n = 0 + other_files_total = 0 + for (i = 1; i <= n; i++) { + split(rows[i], parts, "\t") + t = parts[2] + c = type_counts[t] + if (c >= OTHER_THRESHOLD) { + shown_n += 1 + shown_type[shown_n] = t + shown_count[shown_n] = c + } else { + other_n += 1 + other_type[other_n] = t + other_files_total += c + } + } + + # Emit per-type rows. + for (i = 1; i <= shown_n; i++) { + t = shown_type[i] + c = shown_count[i] + hint = "" + if (t in type_shebang) hint = "shebang" + if (t in type_exts) { + # Sort this types extensions by their per-ext count desc, name asc. + split(type_exts[t], exts_arr, " ") + em = 0 + delete ext_rows + for (k in exts_arr) { + em += 1 + ext_rows[em] = sprintf("%08d\t%s", 99999999 - ext_counts[exts_arr[k]], exts_arr[k]) + } + asort(ext_rows) + for (k = 1; k <= em; k++) { + split(ext_rows[k], eparts, "\t") + ext_name = eparts[2] + if (hint == "") hint = "`" ext_name "`" + else hint = hint ", `" ext_name "`" + } + } + printf "- %-16s %5d (%s)\n", t ":", c, hint + } + + # Emit the (other) summary line if anything landed there. + if (other_n > 0) { + fw = (other_files_total == 1) ? "file" : "files" + kw = (other_n == 1) ? "kind" : "kinds" + printf "- (other): %d %s across %d %s\n", other_files_total, fw, other_n, kw + } + + if (list_unclassified && other_n > 0) { + for (i = 1; i <= other_n; i++) { + t = other_type[i] + printf " - %s (%d):\n", t, type_counts[t] + split(type_files[t], files_arr, "\n") + fn = 0 + delete sorted_files + for (k in files_arr) { fn += 1; sorted_files[fn] = files_arr[k] } + asort(sorted_files) + for (k = 1; k <= fn; k++) { + printf " - `%s`\n", sorted_files[k] + } + } + } + } +' + +# Truncation footer. +# +# Naming every capped subtree gets very noisy fast (a wide monorepo can +# have hundreds of siblings all capped at ~equal shares). Show the top +# 10 by budget spent, then summarize the rest with a count. The top-10 +# picks out the subtrees where the walker got farthest before giving up +# -- these are usually the more interesting/heavy ones to know about. +if [ ${#truncated[@]} -gt 0 ]; then + if [ "$wallclock_hit" -eq 1 ]; then + echo "- (truncated: wallclock ${WALLCLOCK_SECS}s reached; ${budget_used} path handles walked)" + else + echo "- (truncated: budget of ${budget_max} path handles exhausted; ${budget_used} spent)" + fi + TOP_N=10 + mapfile -t sorted_trunc < <( + for entry in "${truncated[@]}"; do + printf '%s\n' "$entry" + done | sort -t$'\t' -k2,2rn + ) + shown=0 + for entry in "${sorted_trunc[@]}"; do + if [ "$shown" -ge "$TOP_N" ]; then break; fi + sub_path=${entry%%$'\t'*} + sub_count=${entry##*$'\t'} + rel=${sub_path#"$root"/} + [ "$rel" = "$sub_path" ] && rel=$sub_path + echo " - \`${rel}/\` capped at ${sub_count}" + shown=$((shown + 1)) done + if [ ${#truncated[@]} -gt "$TOP_N" ]; then + echo " - ... ($((${#truncated[@]} - TOP_N)) more capped subtrees)" + fi fi