lowfat-plugin 0.6.10

#!/usr/bin/env lowfat-filter
# git-compact — compact git output for LLM contexts
# env: $sub $level $exit $args

# ── shared helpers ────────────────────────────────────────────────
define strip-trailers:
    drop /^[[:space:]]*(Signed-off-by|Co-authored-by|Change-Id|Reviewed-by|Acked-by|Tested-by|Reported-by|Cc):/

define abbrev-hash:
    shell: sed -E 's/^commit ([0-9a-f]{12})[0-9a-f]{28}/commit \1/'

# State machine: drop pre-hunk metadata (--- +++ index mode), drop
# unchanged context, strip @@ function-context tail when ultra.
# Past the cap, keep counting so the tail marker reports what was cut.
define compact-diff(limit):
    shell: |
        awk -v lim=$1 -v lvl=$level '
          BEGIN { in_hunk=0; n=0; xf=0; xl=0 }
          /^diff / { in_hunk=0
                     if (n>=lim) { xf++; next }
                     print; n++; next }
          /^@@ /  { in_hunk=1
                    if (n>=lim) { xl++; next }
                    if (lvl=="ultra" && match($0,/ @@/))
                        print substr($0,1,RSTART+2)
                    else print
                    n++; next }
          lvl=="ultra" { next }
          in_hunk && /^[+-]/ { if (n>=lim) { xl++; next }
                               print; n++ }
          END { if (xf || xl)
                    printf "... [git-compact: truncated; %d more files, %d more lines omitted - use LOWFAT_LEVEL=lite for the full diff]\n", xf, xl }
        '

# Pre-hunk meta duplicates the `diff --git` path. `index` may end without
# a mode, hence own anchor; --- / +++ keep the space guard for `--` lines.
define drop-index-meta:
    drop /^(index [0-9a-f]+\.\.[0-9a-f]+( [0-7]+)?$|(new file mode |deleted file mode |old mode |new mode |similarity index |dissimilarity index |rename from |rename to |copy from |copy to |---|\+\+\+) )/

# ── status ────────────────────────────────────────────────────────
# File entries: long-format indents them with a tab; short/porcelain (`-s`)
# prefixes two status-code columns. At full/lite we also keep the section
# headers ("On branch", "Changes …", "Untracked …", "## branch" for porcelain)
# since they carry staged-vs-unstaged context; ultra strips them down to
# file entries only.
status:
    match level:
        ultra:
            keep /^(\t|[ MADRCU?!]{2} )/
            head 15
            or "git status: clean"
        lite:
            keep /^(\t|[ MADRCU?!]{2} |## |On branch|Changes|Untracked)/
            head 60
            or "git status: clean"
        else:
            keep /^(\t|[ MADRCU?!]{2} |## |On branch|Changes|Untracked)/
            head 30
            or "git status: clean"

# ── diff ──────────────────────────────────────────────────────────
# Lite: uncapped, drops only pre-hunk meta + blank context lines.
diff:
    if exit failed:
        raw
    elif level ultra:
        compact-diff 30
        or-shell: awk 'NF' | head -50
    elif level lite:
        drop-index-meta
        drop /^ ?[[:space:]]*$/
    else:
        compact-diff 200
        or-shell: awk 'NF' | head -50

# ── log ───────────────────────────────────────────────────────────
log:
    match level:
        ultra:
            keep /^(commit |    )/
            strip-trailers
            abbrev-hash
            head 10
        lite:
            strip-trailers
            abbrev-hash
            head 50
        else:
            strip-trailers
            abbrev-hash
            head 25

# ── show ──────────────────────────────────────────────────────────
# Lite is permissive — only trailers and pre-hunk meta are dropped.
show:
    match level:
        ultra:
            keep /^(commit |Author:|Date:|    |diff --git)/
            strip-trailers
            abbrev-hash
            head 20
        lite:
            strip-trailers
            abbrev-hash
            drop-index-meta
            head 200
        else:
            # split at first `diff `, run separate chains on each half
            split /^diff /
            pre:
                keep /^(commit |Merge:|Author:|Date:|    )/
                strip-trailers
                abbrev-hash
            post:
                compact-diff 100
            head 100

# ── default ───────────────────────────────────────────────────────
*:
    head 30