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1 ; Copyright (c) Rich Hickey. All rights reserved.
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2 ; The use and distribution terms for this software are covered by the
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3 ; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
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4 ; which can be found in the file epl-v10.html at the root of this distribution.
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5 ; By using this software in any fashion, you are agreeing to be bound by
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6 ; the terms of this license.
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7 ; You must not remove this notice, or any other, from this software.
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8
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9 ;;; stacktrace.clj: print Clojure-centric stack traces
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10
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11 ;; by Stuart Sierra
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12 ;; January 6, 2009
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13
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14 (ns ^{:doc "Print stack traces oriented towards Clojure, not Java."
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15 :author "Stuart Sierra"}
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16 clojure.stacktrace)
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17
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18 (defn root-cause
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19 "Returns the last 'cause' Throwable in a chain of Throwables."
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20 {:added "1.1"}
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21 [tr]
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22 (if-let [cause (.getCause tr)]
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23 (recur cause)
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24 tr))
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25
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26 (defn print-trace-element
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27 "Prints a Clojure-oriented view of one element in a stack trace."
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28 {:added "1.1"}
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29 [e]
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30 (let [class (.getClassName e)
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31 method (.getMethodName e)]
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32 (let [match (re-matches #"^([A-Za-z0-9_.-]+)\$(\w+)__\d+$" class)]
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33 (if (and match (= "invoke" method))
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34 (apply printf "%s/%s" (rest match))
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35 (printf "%s.%s" class method))))
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36 (printf " (%s:%d)" (or (.getFileName e) "") (.getLineNumber e)))
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37
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38 (defn print-throwable
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39 "Prints the class and message of a Throwable."
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40 {:added "1.1"}
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41 [tr]
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42 (printf "%s: %s" (.getName (class tr)) (.getMessage tr)))
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43
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44 (defn print-stack-trace
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45 "Prints a Clojure-oriented stack trace of tr, a Throwable.
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46 Prints a maximum of n stack frames (default: unlimited).
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47 Does not print chained exceptions (causes)."
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48 {:added "1.1"}
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49 ([tr] (print-stack-trace tr nil))
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50 ([tr n]
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51 (let [st (.getStackTrace tr)]
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52 (print-throwable tr)
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53 (newline)
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54 (print " at ")
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55 (print-trace-element (first st))
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56 (newline)
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57 (doseq [e (if (nil? n)
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58 (rest st)
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59 (take (dec n) (rest st)))]
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60 (print " ")
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61 (print-trace-element e)
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62 (newline)))))
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63
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64 (defn print-cause-trace
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65 "Like print-stack-trace but prints chained exceptions (causes)."
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66 {:added "1.1"}
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67 ([tr] (print-cause-trace tr nil))
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68 ([tr n]
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69 (print-stack-trace tr n)
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70 (when-let [cause (.getCause tr)]
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71 (print "Caused by: " )
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72 (recur cause n))))
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73
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74 (defn e
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75 "REPL utility. Prints a brief stack trace for the root cause of the
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76 most recent exception."
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77 {:added "1.1"}
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78 []
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79 (print-stack-trace (root-cause *e) 8))
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