# ff ssh: local init (keys + config.d), copy key + add host, copy config to remote

function __ff_ssh_has_key
    for f in $HOME/.ssh/id_*
        if test -f $f; and not string match -q '*.pub' -- $f
            return 0
        end
    end
    return 1
end

function __ff_ssh_ensure_keys
    if __ff_ssh_has_key
        echo "SSH key exists, skip generation"
        return 0
    end

    set -l key_path "$HOME/.ssh/id_ed25519"
    set -l comment "$USER@"(hostname -s 2>/dev/null; or echo localhost)
    mkdir -p "$HOME/.ssh"
    chmod 700 "$HOME/.ssh"

    echo "No SSH key found, generating ed25519: $key_path"
    if test -t 0
        ssh-keygen -t ed25519 -f $key_path -C $comment; or return 1
    else
        ssh-keygen -t ed25519 -f $key_path -C $comment -N ""; or return 1
        echo "Non-interactive mode: created with empty passphrase"
    end
end

function __ff_ssh_has_toplevel_include --argument ssh_config
    awk '
        tolower($1) == "host" || tolower($1) == "match" { saw_block = 1 }
        tolower($1) == "include" {
            for (i = 2; i <= NF; i++) {
                if (tolower($i) ~ /(^|\/)config\.d\/\*/) {
                    if (!saw_block) found_ok = 1
                }
            }
        }
        END { exit(found_ok ? 0 : 1) }
    ' "$ssh_config"
end

function __ff_ssh_prepend_include --argument ssh_config include_line
    set -l tmp (mktemp)
    awk -v include_line="$include_line" '
        function is_config_d_include() {
            if (tolower($1) != "include") {
                return 0
            }
            for (i = 2; i <= NF; i++) {
                if (tolower($i) ~ /(^|\/)config\.d\/\*/) {
                    return 1
                }
            }
            return 0
        }
        BEGIN { print include_line }
        is_config_d_include() { next }
        { print }
    ' "$ssh_config" > $tmp
    cp $tmp "$ssh_config"
    rm -f $tmp
    chmod 600 "$ssh_config"
end

function __ff_ssh_ensure_config_d
    set -l ssh_config "$HOME/.ssh/config"
    set -l include_line "Include ~/.ssh/config.d/*"
    mkdir -p "$HOME/.ssh/config.d"
    chmod 700 "$HOME/.ssh"

    if not test -f $ssh_config
        printf '%s\n' "$include_line" > $ssh_config
        chmod 600 $ssh_config
        echo "Created $ssh_config with $include_line"
        return
    end

    chmod 600 $ssh_config
    if __ff_ssh_has_toplevel_include $ssh_config
        echo "config.d Include already in $ssh_config"
        return
    end

    set -l backup "$ssh_config.backup."(date +%Y%m%d%H%M%S)
    cp -p $ssh_config $backup
    __ff_ssh_prepend_include $ssh_config "$include_line"
    echo "Prepended to $ssh_config: $include_line (backup $backup)"
end

function __ff_ssh_resolve_path --argument path
    if test -L $path
        set path (readlink $path)
        if not string match -q '/*' -- $path
            set path "$HOME/.ssh/$path"
        end
    end
    echo $path
end

function __ff_ssh_remote_has_include --argument host
    set -l script 'test -f ~/.ssh/config && awk "
        tolower(\$1) == \"host\" || tolower(\$1) == \"match\" { saw_block = 1 }
        tolower(\$1) == \"include\" {
            for (i = 2; i <= NF; i++) {
                if (tolower(\$i) ~ /(^|\/)config\.d\/\*/) {
                    if (!saw_block) found_ok = 1
                }
            }
        }
        END { exit(found_ok ? 0 : 1) }
    " ~/.ssh/config'
    printf '%s\n' "$script" | ssh -qT $host sh -s
end

function __ff_ssh_remote_ensure_include --argument host
    set -l script 'mkdir -p ~/.ssh/config.d && chmod 700 ~/.ssh
include_line="Include ~/.ssh/config.d/*"
has_toplevel() {
    awk "
        tolower(\$1) == \"host\" || tolower(\$1) == \"match\" { saw_block = 1 }
        tolower(\$1) == \"include\" {
            for (i = 2; i <= NF; i++) {
                if (tolower(\$i) ~ /(^|\/)config\.d\/\*/) {
                    if (!saw_block) found_ok = 1
                }
            }
        }
        END { exit(found_ok ? 0 : 1) }
    " ~/.ssh/config
}
if [ ! -f ~/.ssh/config ]; then
    printf "%s\n" "$include_line" > ~/.ssh/config
    chmod 600 ~/.ssh/config
    echo "Created remote config with config.d Include"
elif has_toplevel; then
    echo "Remote config.d Include already exists"
else
    tmp=$(mktemp)
    awk -v include_line="$include_line" "
        function is_config_d_include() {
            if (tolower(\$1) != \"include\") return 0
            for (i = 2; i <= NF; i++) {
                if (tolower(\$i) ~ /(^|\/)config\.d\/\*/) return 1
            }
            return 0
        }
        BEGIN { print include_line }
        is_config_d_include() { next }
        { print }
    " ~/.ssh/config > "$tmp"
    cp "$tmp" ~/.ssh/config
    rm -f "$tmp"
    chmod 600 ~/.ssh/config
    echo "Prepended config.d Include on remote"
fi'
    printf '%s\n' "$script" | ssh -T $host sh -s
end

function __ff_ssh_resolve_copy_src --argument file
    set -l src $file
    if test -f $src
        echo $src
        return 0
    end
    set -l in_config_d "$HOME/.ssh/config.d/$file"
    if test -f $in_config_d
        echo $in_config_d
        return 0
    end
    set -l dotfile_src "$HOME/.dotfile/ssh/config.d/$file"
    if test -f $dotfile_src
        echo $dotfile_src
        return 0
    end
    return 1
end

function __ff_ssh_copy_remote
    set -l host $argv[1]
    set -l files $argv[2..-1]
    set -l ssh_dir "$HOME/.ssh"
    set -l main_config "$ssh_dir/config"

    if test -z "$host"
        echo "Usage: ff ssh copy <host> <config-file>..."
        echo "  host:  SSH alias or user@hostname"
        echo "  file:  path, or name under ~/.ssh/config.d/"
        return 1
    end

    if test (count $files) -eq 0
        echo "Usage: ff ssh copy <host> <config-file>..."
        echo ""
        echo "Examples:"
        echo "  ff ssh copy mynas 30-hanxi.conf"
        echo "  ff ssh copy mynas ~/.dotfile/ssh/config.d/20-personal.conf"
        if test -d "$ssh_dir/config.d"
            echo ""
            echo "Available in ~/.ssh/config.d/:"
            ls -1 "$ssh_dir/config.d/"
        end
        return 1
    end

    echo "Checking remote Include on $host ..."
    ssh -q $host "mkdir -p ~/.ssh/config.d && chmod 700 ~/.ssh"

    if __ff_ssh_remote_has_include $host
        echo "Remote config.d Include: OK"
    else
        echo "Remote missing config.d Include, adding ..."
        __ff_ssh_remote_ensure_include $host
    end

    for f in $files
        set -l src (__ff_ssh_resolve_copy_src $f 2>/dev/null)
        if test $status -ne 0 -o -z "$src"
            echo "Error: file not found: $f"
            return 1
        end

        set -l resolved_main (__ff_ssh_resolve_path $main_config)
        set -l name (basename $src)

        if test "$src" = "$resolved_main"; or test "$name" = config
            set -l ts (date +%Y%m%d%H%M%S)
            ssh -q $host "test -f ~/.ssh/config && cp ~/.ssh/config ~/.ssh/config.bak.$ts || true"
            scp -q $src "$host:.ssh/config"
            ssh -q $host "chmod 600 ~/.ssh/config"
            echo "Copied $src -> $host:~/.ssh/config"
        else
            scp -q $src "$host:.ssh/config.d/$name"
            ssh -q $host "chmod 600 ~/.ssh/config.d/$name"
            echo "Copied $src -> $host:~/.ssh/config.d/$name"
        end
    end

    echo "Done."
end

# ---- ssh-style argument parsing -------------------------------------------

# ssh short options that consume a following value
function __ff_ssh_opt_takes_value --argument-names flag
    contains -- $flag -b -c -D -E -e -F -I -i -J -L -l -m -O -o -p -Q -R -S -W -w
end

# First non-option argument of `ssh`-style args (the [user@]host)
function __ff_ssh_find_target
    set -l n (count $argv)
    set -l i 1
    while test $i -le $n
        set -l a $argv[$i]
        if test "$a" = '--'
            set i (math $i + 1)
            if test $i -le $n
                echo $argv[$i]
            end
            return 0
        end
        if string match -q -- '-*' $a
            set -l flag (string sub -s 1 -l 2 -- $a)
            if test (string length -- $a) -eq 2; and __ff_ssh_opt_takes_value $flag
                set i (math $i + 2)
                continue
            end
            set i (math $i + 1)
            continue
        end
        echo $a
        return 0
    end
    return 1
end

# Value of a short option, supporting both `-i file` and `-ifile`
function __ff_ssh_argv_value --argument-names flag
    set -l args $argv[2..-1]
    set -l n (count $args)
    set -l flen (string length -- $flag)
    set -l i 1
    while test $i -le $n
        set -l a $args[$i]
        if test "$a" = "$flag"
            set -l j (math $i + 1)
            if test $j -le $n
                echo $args[$j]
            end
            return 0
        end
        if test (string length -- $a) -gt $flen; and string match -q -- "$flag*" $a
            string sub -s (math $flen + 1) -- $a
            return 0
        end
        set i (math $i + 1)
    end
    return 1
end

# One value from `ssh -G` output (stdin)
function __ff_ssh_gval --argument-names key
    while read -l line
        set -l trimmed (string trim -- $line)
        set -l k (string split -m1 ' ' -- $trimmed)[1]
        if test (string lower -- $k) = (string lower -- $key)
            string replace -r '^\S+\s+' '' -- $trimmed
            return 0
        end
    end
end

# Files declaring an exact alias; repeated declarations need manual disambiguation.
function __ff_ssh_find_alias_file --argument-names alias_name
    set -l files $HOME/.ssh/config
    if test -d $HOME/.ssh/config.d
        set files $files $HOME/.ssh/config.d/*
    end
    for f in $files
        test -f $f; or continue
        awk -v want=(string lower -- $alias_name) '
            tolower($1) == "host" {
                for (i = 2; i <= NF && $i !~ /^#/; i++) {
                    if (tolower($i) == want) { print FILENAME; break }
                }
            }
        ' $f
    end
end

# Replace managed values in place; split shared Host declarations for other aliases.
function __ff_ssh_replace_alias --argument-names alias_name original replacement
    awk -v want=(string lower -- $alias_name) -v replacement="$replacement" '
        BEGIN {
            while ((getline line < replacement) > 0) block = block line "\n"
            close(replacement)
        }
        tolower($1) == "host" || tolower($1) == "match" {
            updating = 0
            if (tolower($1) == "host") {
                hit = 0; others = ""; comment = ""
                for (i = 2; i <= NF; i++) {
                    if ($i ~ /^#/) {
                        for (; i <= NF; i++) comment = comment " " $i
                        break
                    }
                    if (tolower($i) == want) hit = 1
                    else others = others " " $i
                }
                if (hit) {
                    printf "%s", block
                    if (others != "") print "Host" others " !" want comment
                    else {
                        updating = 1
                        if (comment != "") print "   " comment
                    }
                    next
                }
            }
        }
        updating && tolower($1) ~ /^(hostname|user|port|identityfile|proxyjump|proxycommand)$/ { next }
        { print }
    ' "$original"
end

# Normalize ssh -G paths (including explicit .pub) to a private-key path.
function __ff_ssh_private_path --argument-names identity
    set identity (string replace -r '^~/' "$HOME/" -- $identity)
    set identity (string replace -a '%d' "$HOME" -- $identity)
    set identity (string replace -r '\.pub$' '' -- $identity)
    if not string match -q '/*' -- $identity
        set identity "$PWD/$identity"
    end
    printf '%s\n' "$identity"
end

# Copy only the selected key; upstream can return 0 after an interrupted filter.
function __ff_ssh_copy_id
    set -l target $argv[1]
    set -l port $argv[2]
    set -l identity $argv[3]
    set -l proxyjump $argv[4]
    set -l proxycommand $argv[5]

    if not type -q ssh-copy-id
        echo "ff ssh: 未找到 ssh-copy-id；未写入 Host（可用 --no-copy 只写配置）" >&2
        return 1
    end

    set -l options -o ConnectTimeout=10 -o ConnectionAttempts=1
    if test -n "$proxyjump"
        set options $options -o "ProxyJump=$proxyjump"
    end
    if test -n "$proxycommand"
        set options $options -o "ProxyCommand=$proxycommand"
    end
    set -l cmd ssh-copy-id -i "$identity.pub" -p "$port" $options "$target"
    echo "复制公钥: $cmd"
    # The wrapper records SIGINT even if ssh-copy-id's cleanup trap exits 0.
    command sh -c 'trap "exit 130" INT; trap "exit 143" TERM; "$@"' ff-ssh $cmd
    if test $status -ne 0
        echo "ff ssh: 公钥复制失败或已取消，未写入 Host" >&2
        return 1
    end

    # A skipped-key warning alone proves nothing. Exclude inherited identities,
    # certificates and multiplexed sessions; the agent may unlock this key only.
    command ssh -F /dev/null -i "$identity" -p "$port" $options \
        -o BatchMode=yes -o PreferredAuthentications=publickey \
        -o IdentitiesOnly=yes -o CertificateFile=none -o ControlPath=none \
        "$target" exit
    if test $status -ne 0
        echo "ff ssh: 公钥可能已复制，但所选密钥登录验证失败，未写入 Host。加密私钥请先用 ssh-add 解锁，或用 --no-copy 只写配置" >&2
        return 1
    end
end

# `ff ssh a@b.com` / `ff ssh -p 2222 -i key root@host`
# 确保本地 key -> ssh-copy-id -> 写 ~/.ssh/config.d/<alias>.conf
function __ff_ssh_add_host
    set -l args
    set -l do_copy 1
    for a in $argv
        if test "$a" = --no-copy
            set do_copy 0
        else
            set args $args $a
        end
    end

    set -l target (__ff_ssh_find_target $args)
    if test -z "$target"
        echo "ff ssh: 未找到 [user@]hostname 参数" >&2
        return 1
    end

    # ssh://user@host:port/path -> user / host / port
    set -l plain (string replace -r '^ssh://' '' -- $target)
    set plain (string replace -r '/.*$' '' -- $plain)
    set -l user ""
    if string match -q '*@*' -- $plain
        set user (string replace -r '@[^@]*$' '' -- $plain)
    end
    set -l hostport (string replace -r '^.*@' '' -- $plain)
    set -l port ""
    if string match -q '*:*' -- $hostport
        set port (string replace -r '^.*:' '' -- $hostport)
        set hostport (string replace -r ':[^:]*$' '' -- $hostport)
    end
    set -l host $hostport
    if test -z "$host"
        echo "ff ssh: 无法解析主机名: $target" >&2
        return 1
    end
    test -n "$port"; or set port (__ff_ssh_argv_value -p $args)

    set -l alias_name $host
    if test -t 0
        read -P "SSH 别名 [$host]: " answer
        if test $status -ne 0
            echo "ff ssh: 已取消，未复制公钥或改写配置" >&2
            return 1
        end
        test -n "$answer"; and set alias_name $answer
    end
    if not string match -qr '^[A-Za-z0-9][A-Za-z0-9._-]*$' -- $alias_name
        echo "ff ssh: 非法别名 '$alias_name'（只允许字母、数字、点、下划线、连字符）" >&2
        return 1
    end

    set -l existing (__ff_ssh_find_alias_file $alias_name)
    if test -n "$existing"
        if test (count $existing) -ne 1
            echo "ff ssh: 别名 '$alias_name' 有多个 Host 声明（$existing），请先手动合并；未复制公钥或改写配置" >&2
            return 1
        end
        echo "SSH 别名 '$alias_name' 已存在于 $existing"
        if not test -t 0
            echo "ff ssh: 非交互模式无法确认覆盖，未复制公钥或改写配置" >&2
            return 1
        end
        read -l -P "覆盖更新 '$alias_name'？[y/N]: " overwrite
        if test $status -ne 0
            echo "ff ssh: 已取消覆盖，未复制公钥或改写配置" >&2
            return 1
        end
        if not contains -- (string lower -- (string trim -- "$overwrite")) y yes
            echo "ff ssh: 未确认覆盖，未复制公钥或改写配置" >&2
            return 1
        end
    else if test -e "$HOME/.ssh/config.d/$alias_name.conf"
        echo "ff ssh: 目标文件已存在但未声明 '$alias_name'，请先手动整理；未复制公钥或改写配置" >&2
        return 1
    end

    # 用 ssh -G 解析最终生效的 HostName/User/Port/Proxy*
    set -l resolved (ssh -G $args 2>/dev/null)
    if test $status -ne 0
        echo "ff ssh: 无法解析 SSH 配置，未写入 Host" >&2
        return 1
    end
    set -l rhost (printf '%s\n' $resolved | __ff_ssh_gval hostname)
    set -l ruser (printf '%s\n' $resolved | __ff_ssh_gval user)
    set -l rport (printf '%s\n' $resolved | __ff_ssh_gval port)
    set -l proxyjump (printf '%s\n' $resolved | __ff_ssh_gval proxyjump)
    set -l proxycommand (printf '%s\n' $resolved | __ff_ssh_gval proxycommand)
    test -n "$rhost"; or set rhost $host
    test -n "$user"; or set user $ruser
    test -n "$port"; or set port $rport
    test -n "$port"; or set port 22
    test "$proxyjump" = none; and set proxyjump ""
    test "$proxycommand" = none; and set proxycommand ""

    # Explicit -i / -o IdentityFile must never silently fall back to another key.
    set -l explicit_identity ""
    for i in (seq (count $args))
        if test "$args[$i]" = -i; and test $i -lt (count $args)
            set explicit_identity $args[(math $i + 1)]
            break
        else if string match -q -- '-i*' "$args[$i]"
            set explicit_identity (string sub -s 3 -- "$args[$i]")
            break
        end
        set -l option ""
        if test "$args[$i]" = -o; and test $i -lt (count $args)
            set option $args[(math $i + 1)]
        else if string match -q -- '-o*' "$args[$i]"
            set option (string sub -s 3 -- "$args[$i]")
        end
        if string match -qri '^identityfile[=[:space:]]' -- "$option"
            set explicit_identity (string replace -ri '^identityfile[=[:space:]]+' '' -- "$option")
            break
        end
    end

    set -l identities (printf '%s\n' $resolved | string match -ri '^identityfile[[:space:]]+.*$' | string replace -r '^\S+\s+' '')
    set -l copy_identity ""
    set -l configured_identity 0
    if test -n "$explicit_identity"
        # ssh -G can omit an unreadable -i and print defaults instead.
        set copy_identity (__ff_ssh_private_path "$explicit_identity")
        set identities
    end
    for candidate in $identities
        set -l private (__ff_ssh_private_path "$candidate")
        set -l name (string replace -- "$HOME/.ssh/" '' "$private")
        if not contains -- "$name" id_rsa id_dsa id_ecdsa id_ecdsa_sk id_ed25519 id_ed25519_sk id_xmss
            set configured_identity 1
        end
        if test -r "$private"; and test -r "$private.pub"
            set copy_identity "$private"
            break
        end
    end

    # ssh-copy-id also supports nonstandard id_*.pub names. Among these, keep
    # its newest-public-key preference, but only select a complete readable pair.
    if test -z "$copy_identity"; and test -z "$explicit_identity"; and test "$configured_identity" = 0
        for pub in (command ls -t "$HOME"/.ssh/id_*.pub 2>/dev/null)
            string match -q '*-cert.pub' -- "$pub"; and continue
            set -l private (__ff_ssh_private_path "$pub")
            if test -r "$private"; and test -r "$pub"
                set copy_identity "$private"
                break
            end
        end
    end

    if test "$do_copy" = 1
        if test -z "$copy_identity"; and test -z "$explicit_identity"; and test "$configured_identity" = 0
            __ff_ssh_ensure_keys; or return 1
            set -l generated "$HOME/.ssh/id_ed25519"
            if test -r "$generated"; and test -r "$generated.pub"
                set copy_identity "$generated"
            end
        end
        if test -z "$copy_identity"; or not test -r "$copy_identity"; or not test -r "$copy_identity.pub"
            echo "ff ssh: 未找到可读的公私钥对，请用 -i 指定密钥；未写入 Host" >&2
            return 1
        end
        echo "所选 SSH 密钥: $copy_identity"
        set -l copy_target "$rhost"
        test -n "$user"; and set copy_target "$user@$rhost"
        __ff_ssh_copy_id "$copy_target" "$port" "$copy_identity" "$proxyjump" "$proxycommand"; or return 1
    end

    set -l identity "$copy_identity"
    if string match -q -- "$HOME/*" "$identity"
        set identity "~/"(string sub -s (math (string length -- "$HOME") + 2) -- "$identity")
    end

    set -l dir "$HOME/.ssh/config.d"
    set -l conf_file "$dir/$alias_name.conf"
    test -n "$existing"; and set conf_file "$existing"

    set -l tmpdir /tmp
    test -n "$TMPDIR"; and set tmpdir $TMPDIR
    set -l tmp (mktemp "$tmpdir/ff-ssh.XXXXXX")
    begin
        printf 'Host %s\n' $alias_name
        printf '    HostName %s\n' $rhost
        if test -n "$user"
            printf '    User %s\n' $user
        end
        printf '    Port %s\n' $port
        if test -n "$identity"
            printf '    IdentityFile "%s"\n' $identity
        end
        if test -n "$proxyjump"
            printf '    ProxyJump %s\n' $proxyjump
        end
        if test -n "$proxycommand"
            printf '    ProxyCommand %s\n' $proxycommand
        end
    end > $tmp
    if test -n "$existing"
        set -l updated (mktemp "$tmpdir/ff-ssh.XXXXXX"); or begin
            rm -f $tmp
            return 1
        end
        __ff_ssh_replace_alias "$alias_name" "$conf_file" "$tmp" > $updated; or begin
            rm -f $tmp $updated
            return 1
        end
        rm -f $tmp
        set tmp $updated
        # config.d/* would load backups too, so keep them outside that directory.
        set -l backup_dir "$HOME/.ssh/config.backups"
        mkdir -p "$backup_dir"; or return 1
        chmod 700 "$backup_dir"
        set -l backup (mktemp "$backup_dir/"(basename "$conf_file")".backup.XXXXXX"); or return 1
        cp -p "$conf_file" "$backup"; or begin
            rm -f $tmp $backup
            return 1
        end
        echo "原配置备份: $backup"
    end
    mkdir -p $dir; or return 1
    chmod 700 "$HOME/.ssh" $dir
    chmod 600 $tmp
    mv $tmp $conf_file; or return 1
    __ff_ssh_ensure_config_d; or return 1

    echo "已写入 SSH 配置: $conf_file"
    echo "以后可直接运行: ssh $alias_name"
end

function __ff_ssh_usage
    echo "用法: ff ssh [init | <ssh 参数> | add <ssh 参数> | run <ssh 参数> | copy <host> <file>... | help]"
    echo ""
    echo "  (无参数) / init     确保本地 SSH key 存在，并启用 ~/.ssh/config.d Include"
    echo "  add <ssh 参数>      确保本地 key，ssh-copy-id 后写入 ~/.ssh/config.d/<别名>.conf"
    echo "  run <ssh 参数>      同 add，写完后立即连接（此时应已免密）"
    echo "  <ssh 参数>          裸参数等同 add（例: ff ssh -p 2222 root@1.2.3.4）"
    echo "  copy <host> <file>  检查远端 Include，然后 scp 指定配置文件到远端"
    echo "  help                显示此帮助"
    echo ""
    echo "选项:"
    echo "  --no-copy           只写配置，不执行 ssh-copy-id 或登录验证"
    echo "  重复别名需交互确认覆盖（默认否），成功后备份并在原位置更新"
    echo "  公钥复制后仅用所选密钥验证登录；连接超时 10 秒，失败或取消不写 Host"
    echo "  验证使用 BatchMode；加密私钥请先用 ssh-add 解锁"
    echo ""
    echo "保留子命令: init / copy / add / run / help（同名主机请用 ssh 直接连接）"
    echo ""
    echo "示例:"
    echo "  ff ssh                              # 初始化本地 key 与 config.d"
    echo "  ff ssh a@b.com                      # 复制公钥 + 添加 Host 配置（交互式确认别名）"
    echo "  ff ssh -p 2222 -i ~/.ssh/id_x root@1.2.3.4"
    echo "  ff ssh --no-copy a@b.com            # 只写配置，不复制公钥"
    echo "  ff ssh run a@b.com                  # 复制公钥 + 写配置并立即连接"
    echo "  ff ssh copy mynas 30-hanxi.conf     # 推送配置片段到远端"
end

function ff_ssh
    set -l sub (test (count $argv) -ge 1; and echo $argv[1]; or echo init)

    switch $sub
        case init ''
            __ff_ssh_ensure_keys
            __ff_ssh_ensure_config_d
        case add
            __ff_ssh_add_host $argv[2..-1]
        case run
            set -l run_args
            for a in $argv[2..-1]
                test "$a" = --no-copy; and continue
                set run_args $run_args $a
            end
            __ff_ssh_add_host $argv[2..-1]; or return 1
            command ssh $run_args
        case copy
            __ff_ssh_copy_remote $argv[2..-1]
        case help -h --help
            __ff_ssh_usage
        case '*'
            # 裸参数与 ssh 原生参数一致：有主机就记录配置，否则透传给 ssh
            if __ff_ssh_find_target $argv >/dev/null
                __ff_ssh_add_host $argv
            else
                command ssh $argv
            end
    end
end