3 # Helper tool to browse and edit the ifupdown configuration
4 # uses iselect, ed, nano and sudo
6 # Extra iselect commands:
7 # # = toggle commenting of configuration block
8 # d = delete empty line
9 # e = edit the whole file
11 # right-arrow or return = follow to sourced file, or edit the current block
12 # left-arrow or q = go up or exit
14 ;(signal 2 (fn (x) (exit)))
17 ;; all "block starters", including blank lines
18 'ENI-KEY '( "iface" "mapping" "auto" "allow-\\w*" "rename"
19 "source" "source-directory" "$")
20 ;; regex to identify block starters
21 'ENI-HEAD (format "^\\s*#?\\s*(%s)" (join ENI-KEY "|"))
25 (define (is-eni-key PAT S)
26 (when (regex PAT S 0) true))
28 (define (is-eni-comment S)
29 (is-eni-key ENI-COMMENT S)
33 (list A B) (= A B true))
35 (define (eni-starters) ; DATA
36 (flat (ref-all ENI-HEAD DATA is-eni-key)))
38 ;; Pull out the block headed by the B line. If this head is a blank
39 ;; line, then the block includes preceeding comment and the blank line
40 ;; only. Otherwise it includes preceeding comment, head line and fthe
41 ;; following mix of non-head lines and comment lines (i.e. up to next
42 ;; head line). FROM is the line after the prior block, and it is moved
43 ;; to end of this block.
44 (define (sub-divide-DATA B (E (length DATA))) ; DATA FROM
45 (let ((SLICE (fn (F B E) (append (list F B E) (slice DATA F (- E F))))))
46 (SLICE FROM B (set 'FROM (if (empty? (DATA B)) (+ B 1) E)))))
48 ;; Read the "interfaces file" and split up into its "blocks"
49 ;; <block> <commentline>* <headline> ( <otherline> | <commentline> )*
50 (define (read-eni NAME)
51 (letn ((DATA (parse (read-file NAME) "\n"))
54 (setf LASTENI (map sub-divide-DATA BEG (1 BEG)))
55 ;;(map println LASTENI)
60 (define (add-selector X)
61 (cons (format "<s:%d>%s" (X 0) (X 1)) (2 X)))
63 ;; Find the definition block spanning line I in file FILE
64 (define (find-block I FILE)
65 ;;(println (list 'find-block I FILE))
66 (exists (fn (B) (< I (B 2))) (read-eni FILE)))
68 ############################################################
69 ### Interactive actions
71 ## PATH holds interactive state as a stack of [pos file]
72 (setf PATH '(( 0 "/etc/network/interfaces" )) )
75 (define (edit-file I FILE SUDO)
76 (let ((PROC (if SUDO "/usr/bin/sudo /bin/nano" "/bin/nano")))
77 (wait-pid (process (format "%s -F -J 75 -I -l +%d %s" PROC (int I) FILE)))
80 (define (ensure-newline TXT)
81 (if (empty? TXT) "" (ends-with TXT "\n") TXT (string TXT "\n")))
83 (define (update-file B E TXT FILE)
84 ;;(println (list 'update-file B E TXT FILE))
85 (let ((DATA (parse (read-file FILE) "\n")))
86 (write-file TXT (string (join (0 B DATA) "\n" true)
87 (ensure-newline (read-file TXT))
88 (join (E DATA) "\n")))
89 (exec (format "sudo mv %s %s" TXT FILE))
92 (define (key-command-select I FILE) ; PATH
93 (letn ((BLOCK (find-block (- (int I) 1) FILE))
94 (TMP "/tmp/enitool.conf")
95 (HEAD (BLOCK (- (BLOCK 1) (BLOCK 0) -3)))
96 (TAG (or (and (regex "^#?(\\w*) (.*)" HEAD 0) $1) "#"))
99 ("source" (push (list 0 VALUE) PATH))
100 (true (write-file TMP (join (3 BLOCK) "\n" true))
101 (let ((F (file-info TMP 6)))
103 (when (!= F (file-info TMP 6))
104 (update-file (BLOCK 0) (BLOCK 2) TMP FILE)))
108 (define (delete-block-maybe I FILE)
109 (let ((BLOCK (find-block (- (int I) 1) FILE))
110 (TMP "/tmp/enitool.conf"))
111 (when (= (3 BLOCK) '(""))
112 (exec (format "sudo ed %s" FILE)
113 (format "%dd\nw\n" (+ 1 (BLOCK 0)))))))
115 (define (toggle-commenting I FILE)
116 (let ((BLOCK (find-block (- (int I) 1) FILE))
117 (TMP "/tmp/enitool.conf"))
118 (letn ((H (- (BLOCK 1) (BLOCK 0)))
120 (toggle (if (starts-with (TXT H) "#")
121 (fn (X) (if (starts-with X "#") (1 X) X))
122 (fn (X) (string "#" X)))))
123 (write-file TMP (ensure-newline
124 (string (join (0 H TXT) "\n" true)
125 (join (map toggle (H TXT)) "\n"))))
126 (update-file (BLOCK 0) (BLOCK 2) TMP FILE)
129 (define (command-dispatch CMD FILE)
130 (when (regex "([^:]+):([^:]+):(\\S*)\\s*(.*)" CMD 0)
131 (setf (PATH 0 0) (int $1))
133 ((member $2 '("KEY_RIGHT" "RETURN")) (key-command-select $1 FILE))
134 ((= $2 "d") (delete-block-maybe $1 FILE))
135 ((= $2 "#") (toggle-commenting $1 FILE))
136 ((= $2 "e") (edit-file $1 FILE "sudo"))
139 (define (iselect POS FILE)
140 (exec (format "iselect -n '%s' -t '%s' -a -P -K '-k#' -kd -ke -p %d < %s"
141 "enitool" FILE (int POS) FILE)))
144 (let ((SEL (apply iselect (PATH 0))) (FILE (PATH 0 1)))
145 (if SEL (command-dispatch (SEL 0) FILE)