histogram

#!/bin/bash

# ─────────────────────────────────────────────
# Check for required input file
# ─────────────────────────────────────────────
if [ ! -f data.json ]; then
    echo "❌ Error: data.json not found in current directory. Exiting."
    exit 1
fi

# ─────────────────────────────────────────────
# Check for required binary
# ─────────────────────────────────────────────
if ! command -v lowcharts &> /dev/null; then
    echo "❌ Error: 'lowcharts' binary not found in PATH. Exiting."
    exit 1
fi

# ─────────────────────────────────────────────
# Set your field name (defaults to 'size')
# ─────────────────────────────────────────────
FIELD=${FIELD:-size}
BIN_SIZE=100000

# ─────────────────────────────────────────────
# Parse and bin values, then plot using lowcharts
# ─────────────────────────────────────────────
jq -r --arg field "$FIELD" '.[] | .[$field]' data.json \
| awk -v bin_size="$BIN_SIZE" '
{
    bin = int($1 / bin_size) * bin_size;
    bins[bin]++;
}
END {
    for (b in bins)
        printf "%d-%d %d\n", b, b+bin_size-1, bins[b];
}' | sort -n | lowcharts